HexMesh: Enable user to control output with 8-bit ints

doc/manual/source/user/abl_mesh.rst

@@ -64,7 +64,7 @@ parameters.A sample input file is shown below
      mesh_dimensions: [10, 10, 10]
 
 
-.. confval:: output_db
+.. confval:: output_db [nalu_abl_mesh]
 
    The Exodus-II filename where the mesh is output. No default, must be provided
    by the user.
@@ -102,6 +102,11 @@ parameters.A sample input file is shown below
    Name of the element block created with HEX-8 elements. Default value:
    ``fluid_part``.
 
+.. confval:: ioss_8bit_ints
+
+   Boolean flag that enables output of 8-bit ints when writing Exodus mesh.
+   Default value: true.
+
 Boundary names
 ~~~~~~~~~~~~~~
 

src/mesh/abl_mesh.cpp

@@ -19,6 +19,7 @@
  */
 
 #include "mesh/HexBlockMesh.h"
+#include "core/YamlUtils.h"
 
 #include "stk_util/parallel/Parallel.hpp"
 #include "stk_io/WriteMesh.hpp"
@@ -82,7 +83,10 @@ int main(int argc, char** argv)
     blockMesh.run();
 
     std::cout << "Writing mesh to file: " << output_db << std::endl;
-    mesh->set_64bit_flags();
+    bool set_64bit = true;
+    sierra::nalu::wind_utils::get_optional(node, "ioss_8bit_ints", set_64bit);
+
+    if (set_64bit) mesh->set_64bit_flags();
     auto& stkio = mesh->stkio();
     stkio.set_bulk_data(mesh->bulk());
     mesh->write_database(output_db);