Examples

Euler Equations

Proceed with the following steps to run a parallel 2D Euler vortex simulation on a structured mesh:

Create a working directory called euler_vortex_2d/
Copy the configuration file PyFR/examples/euler_vortex_2d/euler_vortex_2d.ini into euler_vortex_2d/
Copy the Gmsh file PyFR/examples/euler_vortex_2d/euler_vortex_2d.msh into euler_vortex_2d/
Run pyfr to convert the Gmsh mesh file into a PyFR mesh file called euler_vortex_2d.pyfrm:
```
pyfr import euler_vortex_2d.msh euler_vortex_2d.pyfrm
```
Run pyfr to partition the PyFR mesh file into two pieces:
```
pyfr partition 2 euler_vortex_2d.pyfrm .
```
Run pyfr to solve the Euler equations on the mesh, generating a series of PyFR solution files called euler_vortex_2d*.pyfrs:
```
mpiexec -n 2 pyfr run -b cuda -p euler_vortex_2d.pyfrm euler_vortex_2d.ini
```
Run pyfr on the solution file euler_vortex_2d-100.0.pyfrs converting it into an unstructured VTK file called euler_vortex_2d-100.0.vtu:
```
pyfr export euler_vortex_2d.pyfrm euler_vortex_2d-100.0.pyfrs euler_vortex_2d-100.0.vtu
```
Visualise the unstructured VTK file in Paraview

Colour map of density distribution at 100 time units.

Proceed with the following steps to run a serial 2D Couette flow simulation on a mixed unstructured mesh:

Create a working directory called couette_flow_2d/
Copy the configuration file PyFR/examples/couette_flow_2d/couette_flow_2d.ini into couette_flow_2d/
Copy the Gmsh mesh file PyFR/examples/couette_flow_2d/couette_flow_2d.msh into couette_flow_2d/
Run pyfr to covert the Gmsh mesh file into a PyFR mesh file called couette_flow_2d.pyfrm:
```
pyfr import couette_flow_2d.msh couette_flow_2d.pyfrm
```
Run pyfr to solve the Navier-Stokes equations on the mesh, generating a series of PyFR solution files called couette_flow_2d-*.pyfrs:
```
pyfr run -b cuda -p couette_flow_2d.pyfrm couette_flow_2d.ini
```
Run pyfr on the solution file couette_flow_2d-040.pyfrs converting it into an unstructured VTK file called couette_flow_2d-040.vtu:
```
pyfr export couette_flow_2d.pyfrm couette_flow_2d-040.pyfrs couette_flow_2d-040.vtu
```
Visualise the unstructured VTK file in Paraview

Colour map of steady-state density distribution.

Proceed with the following steps to run a serial 2D incompressible cylinder flow simulation on a mixed unstructured mesh:

Create a working directory called inc_cylinder_2d/
Copy the configuration file PyFR/examples/inc_cylinder_2d/inc_cylinder_2d.ini into inc_cylinder_2d/
Copy the compressed Gmsh mesh file PyFR/examples/inc_cylinder_2d/inc_cylinder_2d.msh.gz into inc_cylinder_2d/
Unzip the file and run pyfr to covert the Gmsh mesh file into a PyFR mesh file called inc_cylinder_2d.pyfrm:
```
zcat inc_cylinder_2d.msh.gz | pyfr import -tgmsh - inc_cylinder_2d.pyfrm
```
Run pyfr to solve the incompressible Navier-Stokes equations on the mesh, generating a series of PyFR solution files called inc_cylinder_2d-*.pyfrs:
```
pyfr run -b cuda -p inc_cylinder_2d.pyfrm inc_cylinder_2d.ini
```
Run pyfr on the solution file inc_cylinder_2d-75.00.pyfrs converting it into an unstructured VTK file called inc_cylinder_2d-75.00.vtu:
```
pyfr export inc_cylinder_2d.pyfrm inc_cylinder_2d-75.00.pyfrs inc_cylinder_2d-75.00.vtu
```
Visualise the unstructured VTK file in Paraview

Colour map of velocity magnitude distribution at 75 time units.