Node66 - CFD SUPPORT

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Finer mesh

In file blockMeshDict we can change computational mesh to 50×50 cells^3.1.
# mcedit system/blockMeshDict
```
blocks          
(
    hex (0 1 2 3 4 5 6 7) (50 50 1) simpleGrading (1 1 1)
);
```
Run blockMesh:
# blockMesh
For transient simulations the Courant number should by always checked.
Let us change time step to 0.0005s and computation time to 1.5s. Solution will be saved in times 0.1, 0.2, 0.3, …, 1.5s

Let us modify controlDict, e.g.:
# gedit system/controlDict

stopAt          endTime;

endTime         1.5;

deltaT          0.0005;

writeControl    runTime;

writeInterval   0.1;

Run icoFoam on background and forward output into the text file log:
# icoFoam > log &
It is useful to watch the log file how the computation goes:
# tail -f log
Pressing ctrl+c one can jump back to the console
Results can be viewed during computation in paraview (button Refresh Times always rereads the time layers):
# paraFoam

Figure: OpenFOAM cavity tutorial. Velocity vector field.

Figure: OpenFOAM cavity tutorial. Velocity magnitude.

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