XYFDPlus

XYFDPlus is a C++ CFD project for solving 2D compressible Navier-Stokes equations on polygonal unstructured grid.

This project contains a C++ namespace xyfd which allows manipulation and computation on grid.

Grids can be created manually or loaded from external grid generators like Gmsh via a well-formatted .msh file.

@author : Xiasu Yang

Pre-requisites :

1. g++ or clang compiler (c++1x compatible);

2. Eigen for linear algebra;

3. (Optional) Gmsh to visualize .msh files.

Build :

1. go to the project folder :

cd path/to/XYFDPlus/

2. make a copy of main.cpp and name it local_main.cpp (git-ignored) :

cp main.cpp local_main.cpp

3. make a copy of test.cpp and name it local_test.cpp (git-ignored) :

cp test.cpp local_test.cpp

4. build project using

• make : make options :

  • default : make all programs

  make
  

  • main : make main program

  make main
  

  • test : make test program or any other program you choose to put in local_test.cpp

  make test
  

• VS Code : all build options of make exist also in VS Code. Open folder in VS Code and in the toolbar, click

Terminal -> Run Task ...

and select one of the tasks above to run, ex. buildAll task corresponds to make.

5. collect header files for external usage (with library) using

• make :

make headers

• VS Code :

Terminal -> Run Task ... -> buildHeaders

6. clean-up using

• make :

make clean

• VS Code :

Terminal -> Run Task ... -> buildClean

Run :

1. run main program and basic grid info will be written in out, note the out file is git-ignored

• command line :

./main >out

• VS Code :

Terminal -> Run Task ... -> runMain

2. when Enter .msh file name (without extension) : appears in terminal, enter a grid file name (without .msh extension). Two Gmsh .msh files square.msh and ugly.msh are provided as examples. To check .msh file content, go to XYFDPlus/grids/ :

cd path/to/XYFDPlus/grids/
vi *.msh

3. to run other tests in local_test.cpp :

• command line :

./test

• VS Code :

Terminal -> Run Task ... -> runTest