Page 105 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 3.2. Natural Convection in a Closed Cavity

3.2.5 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: 0.01
Y min : 0.0
Y max: 0.01
Z min : 0.0
Z max: 0.001

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: 26 , Cell Ratio : 1.0 , Maximal Ratio : 1
Ny: 26 , Cell Ratio : 1.0 , Maximal Ratio : 1
Nz : 2 , Cell Ratio : 1.0 , Maximal Ratio : 1

In this case, the mesh is regular: ratios between cells is set to 1.

Blocks
In TransAT, the user has the possibility to split the domain into several blocks so that the
simulation can be run on several processors. Indeed, each block is allocated to one processor (but
a processor can handle several blocks). The splitting of the domain can be done in the Blocks
tab, however for this case, the domain can be left as is.

BCs Tab
The boundary conditions must now be set for this case.

• Select BCs tab.

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