Examples

Test cases are available in the PyFR-Test-Cases <https://github.com/PyFR/PyFR-Test-Cases> repository. It is important to note, however, that these examples are all relatively small 2D simulations and, as such, are not suitable for scalability or performance studies.

Euler Equations

2D Euler Vortex

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

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

Compressible Navier–Stokes Equations

2D Couette Flow

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

Navigate to the PyFR-Test-Cases/2d-couette-flow directory:
```
cd PyFR-Test-Cases/2d-couette-flow
```
Run pyfr to covert the Gmsh mesh file into a PyFR mesh file called 2d-couette-flow.pyfrm:
```
pyfr import 2d-couette-flow.msh 2d-couette-flow.pyfrm
```
Run pyfr to solve the Navier-Stokes equations on the mesh, generating a series of PyFR solution files called 2d-couette-flow-*.pyfrs:
```
pyfr run -b cuda -p 2d-couette-flow.pyfrm 2d-couette-flow.ini
```
Run pyfr on the solution file 2d-couette-flow-040.pyfrs converting it into an unstructured VTK file called 2d-couette-flow-040.vtu:
```
pyfr export 2d-couette-flow.pyfrm 2d-couette-flow-040.pyfrs 2d-couette-flow-040.vtu
```
Visualise the unstructured VTK file in Paraview

Incompressible Navier–Stokes Equations

2D Incompressible Cylinder Flow

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

Navigate to the PyFR-Test-Cases/2d-inc-cylinder directory:
```
cd PyFR-Test-Cases/2d-inc-cylinder
```
Run pyfr to covert the Gmsh mesh file into a PyFR mesh file called 2d-inc-cylinder.pyfrm:
```
pyfr import 2d-inc-cylinder.msh 2d-inc-cylinder.pyfrm
```
Run pyfr to solve the incompressible Navier-Stokes equations on the mesh, generating a series of PyFR solution files called 2d-inc-cylinder-*.pyfrs:
```
pyfr run -b cuda -p 2d-inc-cylinder.pyfrm 2d-inc-cylinder.ini
```
Run pyfr on the solution file 2d-inc-cylinder-75.00.pyfrs converting it into an unstructured VTK file called 2d-inc-cylinder-75.00.vtu:
```
pyfr export 2d-inc-cylinder.pyfrm 2d-inc-cylinder-75.00.pyfrs 2d-inc-cylinder-75.00.vtu
```
Visualise the unstructured VTK file in Paraview