Page 157 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 4.3. Bubbles Merging

To define the number of cells in the domain and the refinement zones,

• Select Grid
The chosen mesh in this case is regular so the ratios between cells will be set to 1.

• Set the grid properties as follows

Nx: 21 , Cell Ratio : 1.0 , Maximal Ratio : 1
Ny: 51 , Cell Ratio : 1.0 , Maximal Ratio : 1
Nz : 21 , Cell Ratio : 1.0 , Maximal Ratio : 1

Blocks
The domain must now be decomposed into several blocks so that the simulation can be run on
several processors. A processor can handle several block but each block is to be allocated to one
processor.
To decompose the domain into several blocks,

• Select Blocks to define the multiblock option.

• Click to cut your domain in several computational blocks.

• Choose 3 for Y direction then click .

The domain will automatically be cut into blocks of equivalent sizes.

BCs Tab
The boundary conditions must now be set for this case. Here a simple wall boundary condition
will be defined for all boundaries.

• Select the BCs tab.

• First, select All surfaces in the drop-down list to show all available boundary surfaces.

• Ensure the Wall BC is available and has a type of Wall

• The wall BC can remain with default properties and does not need to be edited

• Check the wall boundary condition by clicking the small light grey square at the corre-
sponding line in the boundary conditions table

• Select all six surfaces by dragging the mouse in the surafce tree then click to associate
the wall boundary condition to all the surfaces.

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Ascomp AG Switzerland 147 Version 5.7