Page 398 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 10.1. Flow past a backward facing step

10.1.6 Mesh & BCs Tab

The domain is defined and the mesh is created in the Mesh & BCs tab.

• If that is not already the case, select the Mesh & BCs tab at the top of the TransATUI
window

Domain & Grid
In this section the domain and the computational grid for the simulation will be defined.

• Select the Domain & Grid tab located in the sub-window on the left-hand side.
• In the Domain section, set the domain boundaries as follows

X min : 0.0
X max: 0.08
Y min : 0.0
Y max: 0.01
Z min : −0.0005
Z max: 0.0005

The number of cells in the domain and the refinement zones are defined in the Domain & Grid
tab

• Modify the fields defining the grid with the values given below to define the number of cells
of the mesh
Nx: 101 , Cell Ratio : 1.10 , Maximal Ratio : 6
Ny: 51 , Cell Ratio : 1.10 , Maximal Ratio : 6
Nz : 2 , Cell Ratio : 1.10 , Maximal Ratio : 6

• Select Edges Refinement in the Refinement Type section

In this case, the cell ratios are set to 1.10 to have a refinements in the vicinity of the step.

Blocks
The domain will now be decomposed into several blocks, so that the simulation can run in
parallel (i.e. on several processors). Indeed, each block is allocated to one processor (but a
processor can handle several blocks).

• Select the Blocks tab

• Click

• Enter the number of blocks in the different directions as follows then click

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