diff --git a/OMCompiler/SimulationRuntime/c/simulation/solver/external_input.c b/OMCompiler/SimulationRuntime/c/simulation/solver/external_input.c
index ea09cc37334..b19ed31dcac 100644
--- a/OMCompiler/SimulationRuntime/c/simulation/solver/external_input.c
+++ b/OMCompiler/SimulationRuntime/c/simulation/solver/external_input.c
@@ -55,45 +55,31 @@ int externalInputallocate(DATA* data)
   FILE * pFile = NULL;
   int i,j;
   short useLibCsvH = 1;
-  char * cflags = NULL;
+  char * csv_input_file = NULL;
 
 
-  cflags = (char*)omc_flagValue[FLAG_INPUT_CSV];
-  if(!cflags){
-    cflags = (char*)omc_flagValue[FLAG_INPUT_FILE];
-    useLibCsvH = 0;
-    if(cflags){
-      pFile = omc_fopen(cflags,"r");
-      if(pFile == NULL)
-        warningStreamPrint(LOG_STDOUT, 0, "OMC can't find the file %s.",cflags);
-    }else{
-      pFile = omc_fopen("externalInput.csv","r");
-    }
+  csv_input_file = (char*)omc_flagValue[FLAG_INPUT_CSV];
+  if(!csv_input_file) {
+    data->simulationInfo->external_input.active = 0;
+    return 0;
   }
 
-  data->simulationInfo->external_input.active = (modelica_boolean) (pFile != NULL);
-  if(data->simulationInfo->external_input.active || useLibCsvH){
-    if(useLibCsvH){
-      externalInputallocate2(data, cflags);
-    }else
-      externalInputallocate1(data, pFile);
-
-    if(ACTIVE_STREAM(LOG_SIMULATION))
-    {
-      printf("\nExternal Input");
-      printf("\n========================================================");
-      for(i = 0; i < data->simulationInfo->external_input.n; ++i){
-        printf("\nInput: t=%f   \t", data->simulationInfo->external_input.t[i]);
-        for(j = 0; j < data->modelData->nInputVars; ++j){
-          printf("u%d(t)= %f \t",j+1,data->simulationInfo->external_input.u[i][j]);
-        }
+  externalInputallocate2(data, csv_input_file);
+
+  if(ACTIVE_STREAM(LOG_SIMULATION))
+  {
+    printf("\nExternal Input");
+    printf("\n========================================================");
+    for(i = 0; i < data->simulationInfo->external_input.n; ++i){
+      printf("\nInput: t=%f   \t", data->simulationInfo->external_input.t[i]);
+      for(j = 0; j < data->modelData->nInputVars; ++j){
+        printf("u%d(t)= %f \t",j+1,data->simulationInfo->external_input.u[i][j]);
       }
-      printf("\n========================================================\n");
     }
-
-    data->simulationInfo->external_input.i = 0;
+    printf("\n========================================================\n");
   }
 
+  data->simulationInfo->external_input.i = 0;
   return 0;
 }
 
@@ -157,50 +143,6 @@ void externalInputallocate2(DATA* data, char *filename){
   data->simulationInfo->external_input.active = data->simulationInfo->external_input.n > 0;
 }
 
-static inline void externalInputallocate1(DATA* data, FILE * pFile){
-  int n,m,c;
-  int i,j;
-  n = 0;
-
-  while(1) {
-    c = fgetc(pFile);
-    if (c==EOF) break;
-    if (c=='\n') ++n;
-  }
-  // check if csv file is empty!
-  if (n == 0)
-  {
-    fprintf(stderr, "External input file: externalInput.csv is empty!\n"); fflush(NULL);
-    EXIT(1);
-  }
-
-  --n;
-  data->simulationInfo->external_input.n = n;
-  data->simulationInfo->external_input.N = data->simulationInfo->external_input.n;
-  rewind(pFile);
-
-  do{
-    c = fgetc(pFile);
-    if (c==EOF) break;
-  }while(c!='\n');
-
-  m = data->modelData->nInputVars;
-  data->simulationInfo->external_input.u = (modelica_real**)calloc(modelica_integer_max(1,n),sizeof(modelica_real*));
-  for(i = 0; i<data->simulationInfo->external_input.n; ++i)
-    data->simulationInfo->external_input.u[i] = (modelica_real*)calloc(modelica_integer_max(1,m),sizeof(modelica_real));
-  data->simulationInfo->external_input.t = (modelica_real*)calloc(modelica_integer_max(1,data->simulationInfo->external_input.n),sizeof(modelica_real));
-
-  for(i = 0; i < data->simulationInfo->external_input.n; ++i){
-    c = fscanf(pFile, "%lf", &data->simulationInfo->external_input.t[i]);
-    for(j = 0; j < m; ++j){
-    c = fscanf(pFile, "%lf", &data->simulationInfo->external_input.u[i][j]);
-    }
-    if(c<0)
-    data->simulationInfo->external_input.n = i;
-  }
-  fclose(pFile);
-}
-
 int externalInputFree(DATA* data)
 {
   if(data->simulationInfo->external_input.active){
diff --git a/OMCompiler/SimulationRuntime/c/util/simulation_options.c b/OMCompiler/SimulationRuntime/c/util/simulation_options.c
index 2fce891daf0..d5f0726e3a7 100644
--- a/OMCompiler/SimulationRuntime/c/util/simulation_options.c
+++ b/OMCompiler/SimulationRuntime/c/util/simulation_options.c
@@ -83,7 +83,6 @@ const char *FLAG_NAME[FLAG_MAX+1] = {
   /* FLAG_IMPRK_LS */                     "impRKLS",
   /* FLAG_INITIAL_STEP_SIZE */            "initialStepSize",
   /* FLAG_INPUT_CSV */                    "csvInput",
-  /* FLAG_INPUT_FILE */                   "exInputFile",
   /* FLAG_INPUT_FILE_STATES */            "stateFile",
   /* FLAG_INPUT_PATH */                   "inputPath",
   /* FLAG_IPOPT_HESSE*/                   "ipopt_hesse",
@@ -214,7 +213,6 @@ const char *FLAG_DESC[FLAG_MAX+1] = {
   /* FLAG_IMPRK_LS */                     "selects the linear solver of the integration methods: impeuler, trapezoid and imprungekuta",
   /* FLAG_INITIAL_STEP_SIZE */            "value specifies an initial step size for supported solver",
   /* FLAG_INPUT_CSV */                    "value specifies an csv-file with inputs for the simulation/optimization of the model",
-  /* FLAG_INPUT_FILE */                   "value specifies an external file with inputs for the simulation/optimization of the model",
   /* FLAG_INPUT_FILE_STATES */            "value specifies an file with states start values for the optimization of the model",
   /* FLAG_INPUT_PATH */                   "value specifies a path for reading the input files i.e., model_init.xml and model_info.json",
   /* FLAG_IPOPT_HESSE */                  "value specifies the hessian for Ipopt",
@@ -420,8 +418,6 @@ const char *FLAG_DETAILED_DESC[FLAG_MAX+1] = {
   "  Value specifies an initial step size, used by the methods: dassl, ida",
   /* FLAG_INPUT_CSV */
   "  Value specifies an csv-file with inputs for the simulation/optimization of the model",
-  /* FLAG_INPUT_FILE */
-  "  Value specifies an external file with inputs for the simulation/optimization of the model.",
   /* FLAG_INPUT_FILE_STATES */
   "  Value specifies an file with states start values for the optimization of the model.",
   /* FLAG_INPUT_PATH */
@@ -668,7 +664,6 @@ const flag_repeat_policy FLAG_REPEAT_POLICIES[FLAG_MAX] = {
   /* FLAG_IMPRK_LS */                     FLAG_REPEAT_POLICY_FORBID,
   /* FLAG_INITIAL_STEP_SIZE */            FLAG_REPEAT_POLICY_FORBID,
   /* FLAG_INPUT_CSV */                    FLAG_REPEAT_POLICY_FORBID,
-  /* FLAG_INPUT_FILE */                   FLAG_REPEAT_POLICY_FORBID,
   /* FLAG_INPUT_FILE_STATES */            FLAG_REPEAT_POLICY_FORBID,
   /* FLAG_INPUT_PATH */                   FLAG_REPEAT_POLICY_FORBID,
   /* FLAG_IPOPT_HESSE*/                   FLAG_REPEAT_POLICY_FORBID,
@@ -798,7 +793,6 @@ const int FLAG_TYPE[FLAG_MAX] = {
   /* FLAG_IMPRK_ORDER */                  FLAG_TYPE_OPTION,
   /* FLAG_INITIAL_STEP_SIZE */            FLAG_TYPE_OPTION,
   /* FLAG_INPUT_CSV */                    FLAG_TYPE_OPTION,
-  /* FLAG_INPUT_FILE */                   FLAG_TYPE_OPTION,
   /* FLAG_INPUT_FILE_STATES */            FLAG_TYPE_OPTION,
   /* FLAG_INPUT_PATH */                   FLAG_TYPE_OPTION,
   /* FLAG_IPOPT_HESSE */                  FLAG_TYPE_OPTION,
diff --git a/OMCompiler/SimulationRuntime/c/util/simulation_options.h b/OMCompiler/SimulationRuntime/c/util/simulation_options.h
index 2157bef1a74..cc0eab4d4b4 100644
--- a/OMCompiler/SimulationRuntime/c/util/simulation_options.h
+++ b/OMCompiler/SimulationRuntime/c/util/simulation_options.h
@@ -99,7 +99,6 @@ enum _FLAG
   FLAG_IMPRK_LS,
   FLAG_INITIAL_STEP_SIZE,
   FLAG_INPUT_CSV,
-  FLAG_INPUT_FILE,
   FLAG_INPUT_FILE_STATES,
   FLAG_INPUT_PATH,
   FLAG_IPOPT_HESSE,
diff --git a/doc/SimulationRuntime/DynamicOptimization/src/dyOptInitialGuess.tex b/doc/SimulationRuntime/DynamicOptimization/src/dyOptInitialGuess.tex
index d18f3b628e7..5882e554a11 100644
--- a/doc/SimulationRuntime/DynamicOptimization/src/dyOptInitialGuess.tex
+++ b/doc/SimulationRuntime/DynamicOptimization/src/dyOptInitialGuess.tex
@@ -73,13 +73,13 @@
 
 \maketitle
 \abstract{
-The initial guess is (any other nonlinear problem) important to find the soulation. The optimizer need for each time point an initial guess. Currently it's not possible formulate a initial guess/start value for each time point with Modelica. The following notes help to make a initial guess for dyn. optimization with \OpenModelica{}.\\
+The initial guess is (any other nonlinear problem) important to find the solution. The optimizer need for each time point an initial guess. Currently it's not possible formulate a initial guess/start value for each time point with Modelica. The following notes help to make a initial guess for dyn. optimization with \OpenModelica{}.\\
 
 tip: see \url{https://build.openmodelica.org/Documentation/OpenModelica.Scripting.html} for \OpenModelica{} scripting.
 }
 
 \section{prior simulator}
-\OpenModelica{} automaticly done a prior simulatn and use the simulation as intial guess.
+\OpenModelica{} automatically done a prior simulation and use the simulation as initial guess.
 \begin{lstlisting}[language=Pascal, caption={initial guess with simulation},frame=single,
            label=lst:init]
 optimize(modelxxx, simflags="-ipopt_init SIM");
@@ -91,14 +91,14 @@ \subsection{prior simulator with const inputs}
 \subsection{prior simulator with external inputs}
 \OpenModelica{} fetch the inputs around the prior simulation from a file.
 \begin{lstlisting}[language=Pascal, caption={external inputs},frame=single]
-optimize(modelxxx, simflags="-exInputFile xxx.csv -ipopt_init SIM");
+optimize(modelxxx, simflags="-csvInput xxx.csv -ipopt_init SIM");
 \end{lstlisting}
-\begin{lstlisting}[language=Pascal, caption={example xxx.csv},frame=single,label=lst:exInputFile2]
-time input1 input2 input3
-0 -1 2 3
-0.2 -0.9 2.3 3.5
-0.6 -0.5 2.0 2.9
-1.1 0.3 1.6 3.1);
+\begin{lstlisting}[language=Pascal, caption={example xxx.csv},frame=single,label=lst:csvInput2]
+time, input1, input2, input3
+0, -1, 2, 3
+0.2, -0.9, 2.3, 3.5
+0.6, -0.5, 2.0, 2.9
+1.1, 0.3, 1.6, 3.1);
 \end{lstlisting}
 
 \section{file}
diff --git a/testsuite/openmodelica/cruntime/optimization/basic/BRinitialGuess.mos b/testsuite/openmodelica/cruntime/optimization/basic/BRinitialGuess.mos
index fc3f287337e..3938012be3c 100644
--- a/testsuite/openmodelica/cruntime/optimization/basic/BRinitialGuess.mos
+++ b/testsuite/openmodelica/cruntime/optimization/basic/BRinitialGuess.mos
@@ -8,30 +8,10 @@ getErrorString();
 loadFile("BatchReactor.mo");
 getErrorString();
 
-optimize(nmpcBatchReactor, numberOfIntervals=20, tolerance = 1e-8,  simflags="-ipopt_max_iter=12 -exInputFile ReferenceFiles/initInputForBR.csv -lv LOG_IPOPT_ERROR");
+optimize(nmpcBatchReactor, numberOfIntervals=20, tolerance = 1e-8,  simflags="-ipopt_max_iter=12 -csvInput ReferenceFiles/initInputForBR.csv -lv LOG_IPOPT_ERROR");
 getErrorString();
 
 
-// true
-// ""
-// true
-// ""
-// record SimulationResult
-//     resultFile = "nmpcBatchReactor_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 1.0, numberOfIntervals = 20, tolerance = 0.00000001, method = 'optimization', fileNamePrefix = 'nmpcBatchReactor', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-ipopt_jac=NUM'",
-//     messages = "
-// ******************************************************************************
-// This program contains Ipopt, a library for large-scale nonlinear optimization.
-//  Ipopt is released as open source code under the Eclipse Public License (EPL).
-//          For more information visit https://github.com/coin-or/Ipopt
-// ******************************************************************************
-//
-// "
-// end SimulationResult;
-// ""
-// {"Files Equal!"}
-// ""
-// endResult
 // Result:
 // true
 // ""
@@ -39,7 +19,7 @@ getErrorString();
 // ""
 // record SimulationResult
 //     resultFile = "nmpcBatchReactor_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 1.0, numberOfIntervals = 20, tolerance = 1e-08, method = 'optimization', fileNamePrefix = 'nmpcBatchReactor', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-ipopt_max_iter=12 -exInputFile ReferenceFiles/initInputForBR.csv -lv LOG_IPOPT_ERROR'",
+//     simulationOptions = "startTime = 0.0, stopTime = 1.0, numberOfIntervals = 20, tolerance = 1e-08, method = 'optimization', fileNamePrefix = 'nmpcBatchReactor', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-ipopt_max_iter=12 -csvInput ReferenceFiles/initInputForBR.csv -lv LOG_IPOPT_ERROR'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 //
 // Optimizer Variables
diff --git a/testsuite/openmodelica/cruntime/optimization/basic/DMwarm.mos b/testsuite/openmodelica/cruntime/optimization/basic/DMwarm.mos
index 3539fa30d0d..032dc0e8eff 100644
--- a/testsuite/openmodelica/cruntime/optimization/basic/DMwarm.mos
+++ b/testsuite/openmodelica/cruntime/optimization/basic/DMwarm.mos
@@ -5,7 +5,7 @@
 setCommandLineOptions("+g=Optimica"); getErrorString();
 loadFile("DM.mo"); getErrorString();
 
-optimize(diesel_model, stopTime=0.5, numberOfIntervals=450,tolerance=1e-10, simflags="-lv LOG_IPOPT_ERROR -optimizerNP 1 -exInputFile ./ReferenceFiles/initDM.csv -ipopt_warm_start 12 -emit_protected"); getErrorString();
+optimize(diesel_model, stopTime=0.5, numberOfIntervals=450,tolerance=1e-10, simflags="-lv LOG_IPOPT_ERROR -optimizerNP 1 -csvInput ./ReferenceFiles/initDM.csv -ipopt_warm_start 12 -emit_protected"); getErrorString();
 
 res := OpenModelica.Scripting.compareSimulationResults("diesel_model_res.mat","ReferenceFiles/diesel_model_ref.mat","diesel_model_res.csv",0.05,0.0005); getErrorString();
 
@@ -16,7 +16,7 @@ res := OpenModelica.Scripting.compareSimulationResults("diesel_model_res.mat","R
 // ""
 // record SimulationResult
 //     resultFile = "diesel_model_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 0.5, numberOfIntervals = 450, tolerance = 1e-10, method = 'optimization', fileNamePrefix = 'diesel_model', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-lv LOG_IPOPT_ERROR -optimizerNP 1 -exInputFile ./ReferenceFiles/initDM.csv -ipopt_warm_start 12 -emit_protected'",
+//     simulationOptions = "startTime = 0.0, stopTime = 0.5, numberOfIntervals = 450, tolerance = 1e-10, method = 'optimization', fileNamePrefix = 'diesel_model', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-lv LOG_IPOPT_ERROR -optimizerNP 1 -csvInput ./ReferenceFiles/initDM.csv -ipopt_warm_start 12 -emit_protected'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 //
 // Optimizer Variables
diff --git a/testsuite/openmodelica/cruntime/optimization/basic/DMwarmCsv.mos b/testsuite/openmodelica/cruntime/optimization/basic/DMwarmCsv.mos
index 1f89e1c76a6..89b8eac366a 100644
--- a/testsuite/openmodelica/cruntime/optimization/basic/DMwarmCsv.mos
+++ b/testsuite/openmodelica/cruntime/optimization/basic/DMwarmCsv.mos
@@ -5,7 +5,7 @@
 setCommandLineOptions("+g=Optimica"); getErrorString();
 loadFile("DM.mo"); getErrorString();
 
-optimize(diesel_model, stopTime=0.5, numberOfIntervals=450,tolerance=1e-10, simflags="-lv LOG_IPOPT_ERROR -optimizerNP 1 -exInputFile ./ReferenceFiles/initDM.csv -ipopt_warm_start 12 -emit_protected", outputFormat="csv"); getErrorString();
+optimize(diesel_model, stopTime=0.5, numberOfIntervals=450,tolerance=1e-10, simflags="-lv LOG_IPOPT_ERROR -optimizerNP 1 -csvInput ./ReferenceFiles/initDM.csv -ipopt_warm_start 12 -emit_protected", outputFormat="csv"); getErrorString();
 optimize(diesel_model, stopTime=0.5, numberOfIntervals=450,tolerance=1e-10, simflags="-lv LOG_IPOPT_ERROR -optimizerNP 1 -csvInput ./diesel_model_res.csv -ipopt_max_iter=-1 -emit_protected", outputFormat="mat"); getErrorString();
 
 res := OpenModelica.Scripting.compareSimulationResults("diesel_model_res.mat","ReferenceFiles/diesel_model_ref.mat","diesel_model_diff.csv",0.05,0.0005,{"u_f","u_wg"}); getErrorString();
@@ -17,7 +17,7 @@ res := OpenModelica.Scripting.compareSimulationResults("diesel_model_res.mat","R
 // ""
 // record SimulationResult
 //     resultFile = "diesel_model_res.csv",
-//     simulationOptions = "startTime = 0.0, stopTime = 0.5, numberOfIntervals = 450, tolerance = 1e-10, method = 'optimization', fileNamePrefix = 'diesel_model', options = '', outputFormat = 'csv', variableFilter = '.*', cflags = '', simflags = '-lv LOG_IPOPT_ERROR -optimizerNP 1 -exInputFile ./ReferenceFiles/initDM.csv -ipopt_warm_start 12 -emit_protected'",
+//     simulationOptions = "startTime = 0.0, stopTime = 0.5, numberOfIntervals = 450, tolerance = 1e-10, method = 'optimization', fileNamePrefix = 'diesel_model', options = '', outputFormat = 'csv', variableFilter = '.*', cflags = '', simflags = '-lv LOG_IPOPT_ERROR -optimizerNP 1 -csvInput ./ReferenceFiles/initDM.csv -ipopt_warm_start 12 -emit_protected'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 //
 // Optimizer Variables
diff --git a/testsuite/openmodelica/cruntime/optimization/basic/ReferenceFiles/initDM.csv b/testsuite/openmodelica/cruntime/optimization/basic/ReferenceFiles/initDM.csv
index a5ea71d800d..c3dac5cfee5 100644
--- a/testsuite/openmodelica/cruntime/optimization/basic/ReferenceFiles/initDM.csv
+++ b/testsuite/openmodelica/cruntime/optimization/basic/ReferenceFiles/initDM.csv
@@ -1,452 +1,452 @@
-time u_f u_wg 
-0.000000 0.000009 0.000485 
-0.001111 0.000009 0.000485 
-0.002222 0.000009 0.000425 
-0.003333 0.000009 0.000382 
-0.004444 0.000009 0.000348 
-0.005556 0.000009 0.000322 
-0.006667 0.000009 0.000301 
-0.007778 0.000009 0.000283 
-0.008889 0.000009 0.000268 
-0.010000 0.000009 0.000255 
-0.011111 0.000009 0.000244 
-0.012222 0.000009 0.000235 
-0.013333 0.000009 0.000226 
-0.014444 0.000009 0.000219 
-0.015556 0.000009 0.000212 
-0.016667 0.000009 0.000206 
-0.017778 0.000009 0.000201 
-0.018889 0.000009 0.000196 
-0.020000 0.000009 0.000192 
-0.021111 0.000009 0.000188 
-0.022222 0.000010 0.000184 
-0.023333 0.000010 0.000181 
-0.024444 0.000010 0.000177 
-0.025556 0.000010 0.000175 
-0.026667 0.000010 0.000172 
-0.027778 0.000010 0.000170 
-0.028889 0.000010 0.000167 
-0.030000 0.000010 0.000165 
-0.031111 0.000010 0.000163 
-0.032222 0.000010 0.000161 
-0.033333 0.000010 0.000160 
-0.034444 0.000010 0.000158 
-0.035556 0.000010 0.000157 
-0.036667 0.000010 0.000155 
-0.037778 0.000010 0.000154 
-0.038889 0.000010 0.000153 
-0.040000 0.000010 0.000151 
-0.041111 0.000010 0.000150 
-0.042222 0.000010 0.000149 
-0.043333 0.000010 0.000148 
-0.044444 0.000010 0.000147 
-0.045556 0.000010 0.000147 
-0.046667 0.000010 0.000146 
-0.047778 0.000010 0.000145 
-0.048889 0.000010 0.000144 
-0.050000 0.000010 0.000143 
-0.051111 0.000010 0.000143 
-0.052222 0.000010 0.000142 
-0.053333 0.000010 0.000142 
-0.054444 0.000010 0.000141 
-0.055556 0.000010 0.000140 
-0.056667 0.000010 0.000140 
-0.057778 0.000011 0.000139 
-0.058889 0.000011 0.000139 
-0.060000 0.000011 0.000138 
-0.061111 0.000011 0.000138 
-0.062222 0.000011 0.000138 
-0.063333 0.000011 0.000137 
-0.064444 0.000011 0.000137 
-0.065556 0.000011 0.000136 
-0.066667 0.000011 0.000136 
-0.067778 0.000011 0.000136 
-0.068889 0.000011 0.000135 
-0.070000 0.000011 0.000135 
-0.071111 0.000011 0.000135 
-0.072222 0.000011 0.000134 
-0.073333 0.000011 0.000134 
-0.074444 0.000011 0.000134 
-0.075556 0.000011 0.000134 
-0.076667 0.000011 0.000133 
-0.077778 0.000011 0.000133 
-0.078889 0.000011 0.000133 
-0.080000 0.000011 0.000133 
-0.081111 0.000011 0.000132 
-0.082222 0.000011 0.000132 
-0.083333 0.000011 0.000132 
-0.084444 0.000011 0.000132 
-0.085556 0.000011 0.000132 
-0.086667 0.000011 0.000131 
-0.087778 0.000011 0.000131 
-0.088889 0.000011 0.000131 
-0.090000 0.000011 0.000131 
-0.091111 0.000011 0.000131 
-0.092222 0.000011 0.000130 
-0.093333 0.000011 0.000130 
-0.094444 0.000012 0.000130 
-0.095556 0.000012 0.000130 
-0.096667 0.000012 0.000130 
-0.097778 0.000012 0.000130 
-0.098889 0.000012 0.000130 
-0.100000 0.000012 0.000129 
-0.101111 0.000012 0.000129 
-0.102222 0.000012 0.000129 
-0.103333 0.000012 0.000129 
-0.104444 0.000012 0.000129 
-0.105556 0.000012 0.000129 
-0.106667 0.000012 0.000129 
-0.107778 0.000012 0.000128 
-0.108889 0.000012 0.000128 
-0.110000 0.000012 0.000128 
-0.111111 0.000012 0.000128 
-0.112222 0.000012 0.000128 
-0.113333 0.000012 0.000128 
-0.114444 0.000012 0.000128 
-0.115556 0.000012 0.000128 
-0.116667 0.000012 0.000128 
-0.117778 0.000012 0.000127 
-0.118889 0.000012 0.000127 
-0.120000 0.000012 0.000127 
-0.121111 0.000012 0.000127 
-0.122222 0.000012 0.000127 
-0.123333 0.000012 0.000127 
-0.124444 0.000012 0.000127 
-0.125556 0.000012 0.000127 
-0.126667 0.000012 0.000127 
-0.127778 0.000012 0.000126 
-0.128889 0.000013 0.000126 
-0.130000 0.000013 0.000126 
-0.131111 0.000013 0.000126 
-0.132222 0.000013 0.000126 
-0.133333 0.000013 0.000126 
-0.134444 0.000013 0.000126 
-0.135556 0.000013 0.000126 
-0.136667 0.000013 0.000126 
-0.137778 0.000013 0.000126 
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+0.227778 0.000017 0.000113
+0.228889 0.000017 0.000113
+0.230000 0.000017 0.000113
+0.231111 0.000017 0.000112
+0.232222 0.000017 0.000112
+0.233333 0.000017 0.000111
+0.234444 0.000017 0.000111
+0.235556 0.000017 0.000111
+0.236667 0.000017 0.000110
+0.237778 0.000017 0.000110
+0.238889 0.000017 0.000109
+0.240000 0.000018 0.000109
+0.241111 0.000018 0.000108
+0.242222 0.000018 0.000108
+0.243333 0.000018 0.000107
+0.244444 0.000018 0.000106
+0.245556 0.000018 0.000106
+0.246667 0.000018 0.000105
+0.247778 0.000018 0.000105
+0.248889 0.000018 0.000104
+0.250000 0.000018 0.000103
+0.251111 0.000019 0.000102
+0.252222 0.000019 0.000102
+0.253333 0.000019 0.000101
+0.254444 0.000019 0.000100
+0.255556 0.000019 0.000099
+0.256667 0.000019 0.000098
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+0.258889 0.000019 0.000097
+0.260000 0.000020 0.000096
+0.261111 0.000020 0.000095
+0.262222 0.000020 0.000094
+0.263333 0.000020 0.000093
+0.264444 0.000020 0.000092
+0.265556 0.000020 0.000091
+0.266667 0.000021 0.000089
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+0.268889 0.000021 0.000087
+0.270000 0.000021 0.000086
+0.271111 0.000022 0.000085
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+0.277778 0.000023 0.000077
+0.278889 0.000024 0.000076
+0.280000 0.000024 0.000074
+0.281111 0.000024 0.000073
+0.282222 0.000025 0.000071
+0.283333 0.000025 0.000070
+0.284444 0.000026 0.000068
+0.285556 0.000026 0.000067
+0.286667 0.000027 0.000066
+0.287778 0.000028 0.000064
+0.288889 0.000028 0.000063
+0.290000 0.000029 0.000061
+0.291111 0.000030 0.000060
+0.292222 0.000031 0.000058
+0.293333 0.000032 0.000057
+0.294444 0.000033 0.000055
+0.295556 0.000035 0.000054
+0.296667 0.000036 0.000052
+0.297778 0.000038 0.000051
+0.298889 0.000040 0.000049
+0.300000 0.000042 0.000048
+0.301111 0.000045 0.000046
+0.302222 0.000048 0.000045
+0.303333 0.000052 0.000043
+0.304444 0.000058 0.000042
+0.305556 0.000064 0.000041
+0.306667 0.000072 0.000039
+0.307778 0.000084 0.000038
+0.308889 0.000101 0.000037
+0.310000 0.000128 0.000035
+0.311111 0.000179 0.000034
+0.312222 0.000305 0.000033
+0.313333 0.001207 0.000032
+0.314444 0.179608 0.000022
+0.315556 0.308134 0.000018
+0.316667 0.452762 0.000015
+0.317778 0.619810 0.000012
+0.318889 0.810272 0.000010
+0.320000 0.997083 0.000008
+0.321111 0.999686 0.000008
+0.322222 0.999830 0.000007
+0.323333 0.999882 0.000006
+0.324444 0.999908 0.000006
+0.325556 0.999925 0.000006
+0.326667 0.999936 0.000005
+0.327778 0.999943 0.000005
+0.328889 0.999950 0.000005
+0.330000 0.999954 0.000004
+0.331111 0.999958 0.000004
+0.332222 0.999961 0.000004
+0.333333 0.999964 0.000004
+0.334444 0.999966 0.000004
+0.335556 0.999968 0.000004
+0.336667 0.999970 0.000003
+0.337778 0.999972 0.000003
+0.338889 0.999973 0.000003
+0.340000 0.999974 0.000003
+0.341111 0.999975 0.000003
+0.342222 0.999976 0.000003
+0.343333 0.999977 0.000003
+0.344444 0.999978 0.000003
+0.345556 0.999979 0.000003
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+0.347778 0.999980 0.000002
+0.348889 0.999981 0.000002
+0.350000 0.999981 0.000002
+0.351111 0.999982 0.000002
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+0.354444 0.999983 0.000002
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+0.356667 0.999984 0.000002
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+0.362222 0.999985 0.000002
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+0.370000 0.999986 0.000002
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+0.400000 0.999983 0.000001
+0.401111 0.999982 0.000001
+0.402222 0.999981 0.000001
+0.403333 0.999980 0.000001
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+0.408889 0.999967 0.000001
+0.410000 0.999961 0.000001
+0.411111 0.999951 0.000001
+0.412222 0.999935 0.000001
+0.413333 0.999898 0.000001
+0.414444 0.999750 0.000001
+0.415556 0.958632 0.000001
+0.416667 0.850942 0.000001
+0.417778 0.756934 0.000002
+0.418889 0.674729 0.000002
+0.420000 0.602540 0.000002
+0.421111 0.538863 0.000002
+0.422222 0.482443 0.000002
+0.423333 0.432239 0.000002
+0.424444 0.387384 0.000002
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+0.426667 0.310939 0.000002
+0.427778 0.278230 0.000003
+0.428889 0.248592 0.000003
+0.430000 0.221655 0.000003
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+0.432222 0.174670 0.000003
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+0.434444 0.135240 0.000003
+0.435556 0.117866 0.000004
+0.436667 0.101838 0.000004
+0.437778 0.087023 0.000004
+0.438889 0.073300 0.000004
+0.440000 0.060564 0.000005
+0.441111 0.048721 0.000005
+0.442222 0.037691 0.000005
+0.443333 0.027400 0.000005
+0.444444 0.017788 0.000006
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+0.446667 0.001220 0.000006
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+0.455556 0.000018 0.000009
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+0.457778 0.000014 0.000010
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+0.464444 0.000009 0.000014
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+0.466667 0.000008 0.000016
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+0.470000 0.000006 0.000020
+0.471111 0.000006 0.000022
+0.472222 0.000006 0.000025
+0.473333 0.000006 0.000027
+0.474444 0.000005 0.000031
+0.475556 0.000005 0.000035
+0.476667 0.000005 0.000041
+0.477778 0.000005 0.000048
+0.478889 0.000004 0.000058
+0.480000 0.000004 0.000072
+0.481111 0.000004 0.000094
+0.482222 0.000004 0.000132
+0.483333 0.000004 0.000207
+0.484444 0.000004 0.000436
+0.485556 0.000004 0.028704
+0.486667 0.000004 0.999470
+0.487778 0.000003 0.999708
+0.488889 0.000003 0.999781
+0.490000 0.000003 0.999813
+0.491111 0.000003 0.999825
+0.492222 0.000003 0.999826
+0.493333 0.000003 0.999814
+0.494444 0.000003 0.999783
+0.495556 0.000003 0.999712
+0.496667 0.000003 0.999484
+0.497778 0.000003 0.592464
+0.498889 0.000003 0.000406
+0.500000 0.000004 0.000181
diff --git a/testsuite/openmodelica/cruntime/optimization/basic/ReferenceFiles/initInputForBR.csv b/testsuite/openmodelica/cruntime/optimization/basic/ReferenceFiles/initInputForBR.csv
index 4f3b7cb1dc5..b0b695e3a3d 100644
--- a/testsuite/openmodelica/cruntime/optimization/basic/ReferenceFiles/initInputForBR.csv
+++ b/testsuite/openmodelica/cruntime/optimization/basic/ReferenceFiles/initInputForBR.csv
@@ -1,62 +1,62 @@
-time u 
-0.000000 0.743547 
-0.007753 0.747304 
-0.032247 0.747304 
-0.050000 0.747304 
-0.057753 0.772709 
-0.082247 0.772709 
-0.100000 0.772709 
-0.107753 0.800326 
-0.132247 0.800326 
-0.150000 0.800326 
-0.157753 0.830488 
-0.182247 0.830488 
-0.200000 0.830488 
-0.207753 0.863601 
-0.232247 0.863601 
-0.250000 0.863601 
-0.257753 0.900169 
-0.282247 0.900169 
-0.300000 0.900169 
-0.307753 0.940823 
-0.332247 0.940823 
-0.350000 0.940823 
-0.357753 0.986367 
-0.382247 0.986367 
-0.400000 0.986367 
-0.407753 1.037848 
-0.432247 1.037848 
-0.450000 1.037848 
-0.457753 1.096650 
-0.482247 1.096650 
-0.500000 1.096650 
-0.507753 1.164654 
-0.532247 1.164654 
-0.550000 1.164654 
-0.557753 1.244495 
-0.582247 1.244495 
-0.600000 1.244495 
-0.607753 1.339995 
-0.632247 1.339995 
-0.650000 1.339995 
-0.657753 1.456953 
-0.682247 1.456953 
-0.700000 1.456953 
-0.707753 1.604690 
-0.732247 1.604690 
-0.750000 1.604690 
-0.757753 1.799371 
-0.782247 1.799371 
-0.800000 1.799371 
-0.807753 2.072198 
-0.832247 2.072198 
-0.850000 2.072198 
-0.857753 2.493949 
-0.882247 2.493949 
-0.900000 2.493949 
-0.907753 3.276597 
-0.932247 3.276597 
-0.950000 3.276597 
-0.957753 5.000000 
-0.982247 5.000000 
-1.000000 5.000000 
+"sep= " time u
+0.000000 0.743547
+0.007753 0.747304
+0.032247 0.747304
+0.050000 0.747304
+0.057753 0.772709
+0.082247 0.772709
+0.100000 0.772709
+0.107753 0.800326
+0.132247 0.800326
+0.150000 0.800326
+0.157753 0.830488
+0.182247 0.830488
+0.200000 0.830488
+0.207753 0.863601
+0.232247 0.863601
+0.250000 0.863601
+0.257753 0.900169
+0.282247 0.900169
+0.300000 0.900169
+0.307753 0.940823
+0.332247 0.940823
+0.350000 0.940823
+0.357753 0.986367
+0.382247 0.986367
+0.400000 0.986367
+0.407753 1.037848
+0.432247 1.037848
+0.450000 1.037848
+0.457753 1.096650
+0.482247 1.096650
+0.500000 1.096650
+0.507753 1.164654
+0.532247 1.164654
+0.550000 1.164654
+0.557753 1.244495
+0.582247 1.244495
+0.600000 1.244495
+0.607753 1.339995
+0.632247 1.339995
+0.650000 1.339995
+0.657753 1.456953
+0.682247 1.456953
+0.700000 1.456953
+0.707753 1.604690
+0.732247 1.604690
+0.750000 1.604690
+0.757753 1.799371
+0.782247 1.799371
+0.800000 1.799371
+0.807753 2.072198
+0.832247 2.072198
+0.850000 2.072198
+0.857753 2.493949
+0.882247 2.493949
+0.900000 2.493949
+0.907753 3.276597
+0.932247 3.276597
+0.950000 3.276597
+0.957753 5.000000
+0.982247 5.000000
+1.000000 5.000000
diff --git a/testsuite/simulation/modelica/solver/LotkaVolterraWithInput.mos b/testsuite/simulation/modelica/solver/LotkaVolterraWithInput.mos
index 5c738740fab..6702b5881f2 100644
--- a/testsuite/simulation/modelica/solver/LotkaVolterraWithInput.mos
+++ b/testsuite/simulation/modelica/solver/LotkaVolterraWithInput.mos
@@ -45,9 +45,8 @@ val(der(rabbits),420);
 
 // create external input file for the next tests
 simulate(LotkaVolterra,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, outputFormat="csv");
-system("awk -F, '{print $1, $3}' LotkaVolterra_res.csv > externalInput.csv");
 
-simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8);
+simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, simflags="-csvInput=LotkaVolterra_res.csv");
 val(rabbits,180);
 val(foxes,200);
 val(rabbits,666);
@@ -55,7 +54,7 @@ val(foxes,760);
 val(derrabbits,42);
 val(derrabbits,420);
 
-simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760, numberOfIntervals=760, tolerance=1e-8, method="euler");
+simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760, numberOfIntervals=760, tolerance=1e-8, method="euler", simflags="-csvInput=LotkaVolterra_res.csv");
 val(rabbits,180);
 val(foxes,200);
 val(rabbits,666);
@@ -63,7 +62,7 @@ val(foxes,760);
 val(derrabbits,42);
 val(derrabbits,420);
 
-simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, method="rungekutta");
+simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, method="rungekutta", simflags="-csvInput=LotkaVolterra_res.csv");
 val(rabbits,180);
 val(foxes,200);
 val(rabbits,666);
@@ -71,7 +70,7 @@ val(foxes,760);
 val(derrabbits,42);
 val(derrabbits,420);
 
-simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, method="impeuler");
+simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, method="impeuler", simflags="-csvInput=LotkaVolterra_res.csv");
 val(rabbits,180);
 val(foxes,200);
 val(rabbits,666);
@@ -79,7 +78,7 @@ val(foxes,760);
 val(derrabbits,42);
 val(derrabbits,420);
 
-simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, method="imprungekutta", simflags="-impRKOrder=5");
+simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, method="imprungekutta", simflags="-impRKOrder=5 -csvInput=LotkaVolterra_res.csv");
 val(rabbits,180);
 val(foxes,200);
 val(rabbits,666);
@@ -87,7 +86,7 @@ val(foxes,760);
 val(derrabbits,42);
 val(derrabbits,420);
 
-simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, method="imprungekutta", simflags="-impRKOrder=6");
+simulate(LotkaVolterraWithInput,startTime=0.0, stopTime=760.0, numberOfIntervals=760, tolerance=1e-8, method="imprungekutta", simflags="-impRKOrder=6 -csvInput=LotkaVolterra_res.csv");
 val(rabbits,180);
 val(foxes,200);
 val(rabbits,666);
@@ -118,10 +117,9 @@ val(derrabbits,420);
 // LOG_SUCCESS       | info    | The simulation finished successfully.
 // "
 // end SimulationResult;
-// 0
 // record SimulationResult
 //     resultFile = "LotkaVolterraWithInput_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'dassl', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = ''",
+//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'dassl', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-csvInput=LotkaVolterra_res.csv'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 // LOG_SUCCESS       | info    | The simulation finished successfully.
 // "
@@ -134,7 +132,7 @@ val(derrabbits,420);
 // 76.4125896314704
 // record SimulationResult
 //     resultFile = "LotkaVolterraWithInput_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'euler', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = ''",
+//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'euler', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-csvInput=LotkaVolterra_res.csv'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 // LOG_SUCCESS       | info    | The simulation finished successfully.
 // "
@@ -147,7 +145,7 @@ val(derrabbits,420);
 // 79.63027796167692
 // record SimulationResult
 //     resultFile = "LotkaVolterraWithInput_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'rungekutta', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = ''",
+//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'rungekutta', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-csvInput=LotkaVolterra_res.csv'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 // LOG_SUCCESS       | info    | The simulation finished successfully.
 // "
@@ -160,7 +158,7 @@ val(derrabbits,420);
 // 76.41278732145514
 // record SimulationResult
 //     resultFile = "LotkaVolterraWithInput_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'impeuler', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = ''",
+//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'impeuler', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-csvInput=LotkaVolterra_res.csv'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 // LOG_SUCCESS       | info    | The simulation finished successfully.
 // "
@@ -173,7 +171,7 @@ val(derrabbits,420);
 // 63.26222998849814
 // record SimulationResult
 //     resultFile = "LotkaVolterraWithInput_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'imprungekutta', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-impRKOrder=5'",
+//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'imprungekutta', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-impRKOrder=5 -csvInput=LotkaVolterra_res.csv'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 // LOG_SUCCESS       | info    | The simulation finished successfully.
 // "
@@ -186,7 +184,7 @@ val(derrabbits,420);
 // 76.4126067599769
 // record SimulationResult
 //     resultFile = "LotkaVolterraWithInput_res.mat",
-//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'imprungekutta', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-impRKOrder=6'",
+//     simulationOptions = "startTime = 0.0, stopTime = 760.0, numberOfIntervals = 760, tolerance = 1e-08, method = 'imprungekutta', fileNamePrefix = 'LotkaVolterraWithInput', options = '', outputFormat = 'mat', variableFilter = '.*', cflags = '', simflags = '-impRKOrder=6 -csvInput=LotkaVolterra_res.csv'",
 //     messages = "LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.
 // LOG_SUCCESS       | info    | The simulation finished successfully.
 // "