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dflo

This code is rather old, for more recent examples of DG codes, see
https://github.com/cpraveen/fem/tree/master/dg1d
https://github.com/cpraveen/fem/tree/master/dg2d

Discontinuous Galerkin solver for compressible flows. Some features of the code are

  • cartesian and quadrilateral cells
  • Qk basis: nodal Lagrange polynomials on Gauss points
  • Pk basis: Legendre polynomials
  • TVB limiter
  • Positivity preserving limiter
  • Flux functions: Lax-Friedrichs, Roe, HLLC, KFVS

###Getting dflo

git clone https://github.com/cpraveen/dflo

To compile code in "src"

You have to first compile deal.II with Trilinos library, UMFPACK, threads. Serial versions of these libraries are sufficient since the code in "src" is a serial code.

  • cd dflo/src
  • You must set the variable DEAL_II_DIR to your deal.II installation directory. It is good to set this in your bashrc file.
  • cmake .
  • make

By default, this compiles a DEBUG version of the code which is good for code development but runs very slowly. In order to compile optimized version, do

make release

To compile code in "src-mpi"

This is the mpi version which uses p4est. So you must install p4est and compile deal.II with p4est support. It does not require trilinos.

To install p4est, see this page

https://www.dealii.org/developer/external-libs/p4est.html

Obtain latest version of deal.II from github

git clone https://github.com/dealii/dealii

Change into dealii directory

cd dealii
mkdir build
cd build

Configure deal.II. A basic setup is given in the file dealii_mpi.sh. Just run this inside build directory

./dealii_mpi.sh

Now compile deal.II and install it

make all
make install

After this you can compile dflo.

Running the code

Many test cases are included in the examples directory. In most examples, a geo file is provided to generate the mesh. You need Gmsh to generate the mesh as follows

gmsh -2 grid.geo

Then run dflo

dflo input.prm

Some parts of dflo are parallelized with threads. You can specify number of threads to use while starting dflo

dflo input.prm 4

which will run with 4 threads.

To run the mpi version, do

mpirun -np 4 dflo input.prm