Copyright (C) 2021 Nguyen Ngoc Sang, https://github.com/SangVn

About VnCFD_2.21.5

VnCFD_2.21.5 is a free, open source computational fluid dynamics (CFD) software released for Educational Purposes. It's written in a combination of Python, Fortran and MPI. The core of calculation, written in Fortran, and the MPI help to speed up the simulations, while Python is comfortable to control Classes and Data. The VnCFD_2.21.5 Code, which is short, clear and easy to read, helps you save a lot of time spent on learning the basic of CFD coding.

Installation Requirements

• Python3, numpy, matplotlib, mpi4py, scipy
• gcc, g++, gfortran (Linux) or MinGW-w64 (Windows)
• mpich (Linux) or Microsoft MPI (Windows)
• paraview

NOTE: READ The Installation Guide to Install All The Requirements

Compiling

1. In the "lib" directory, open Terminal (Command-line, PowerShell), compile the "fortranlib" by one of these commands:
   • ./compile_fortranlib
   • python -m numpy.f2py -c functions.f95 fluxes.f95 -m fortranlib
   • (use "python3" instead of "python" in Linux)

Running Examples

Note: Read more information in Tutorial Guide

1. Open file "setting.py"

   • Choose any example and uncomment 2 lines from ..., path_dir ..., then save the file

2. Open file "project.py" in the chosen example directory (e.g. examples/name/project.py)

   • Check or set new parameters, save the file

3. To start computation, run script "run_auto.py" by one of these commands:

   • python run_auto.py option
   • mpiexec -n N python run_auto.py option
   • mpirun -n N python run_auto.py option (N=1,2,3..)

4. Options

   Task	Option

   • to view help | help
   • to init field | init
   • to run calculation | run
   • to export data | export
   • to plot field | plot_field
   • to plot mesh | plot_mesh
   • to plot convergence | plot_state

Note: Press "ctrl+C" to interrupt the calculation

5. Post-processing
   • Use option plot_...
   • Use run_manual.py to have more flexibility
   • Recommend: use paraview to view field.dat in the chosen example directory

VnCFD_2.21.5 = Python + MPI + Fortran