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.

Previous: Modifications for practice Up: Modifications for practice Next: When the options are

Next: SIMPLE Algorithm Up: TCFDSRTSolver – compressible, transient, Previous: Under-Relaxation Contents Index

Finite Volume Method converts the system of differential equations to the system of linear equations:

GAMG (Geometric-Algebraic Multi-Grid) for both symmetric and asymmetric matrices
PBiCG (Preconditioned Biconjugate Gradient ) for asymmetric matrices
PCG (Preconditioned Conjugate Gradient) for symmetric matrices
smoothSolver (solver using a smoother for both symmetric and asymmetric matrices )
ICCG (Incomplete Cholesky preconditioned PCG solver, i.e. PBiCG with DIC )^3.1
BICCG (Diagonal Incomplete LU preconditioned PBiCG solver, i.e. PCG with DILU)^3.2

DILU (Diagonal Incomplete LU decomposition)
DIC (Diagonal incomplete-Cholesky) for symmetric matrices
FDIC (Faster diagonal incomplete-Cholesky) for symmetric matrices
diagonal (Diagonal)
GAMG (Geometric-Algebraic Multi-Grid)
none (No preconditioning)
DICGaussSeidel, GaussSeidel, nonBlockingGaussSeidel, symGaussSeidel (for symmetric matrices)
For more details see e.g. [10].

Next: SIMPLE Algorithm Up: TCFDSRTSolver – compressible, transient, Previous: Under-Relaxation Contents Index

Previous: TCFD- Running in Up: TCFD- Running in Next: CFD Processor command mode
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Subsections