Page 132 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 4.1. Dam Break

4.1.4.2 Blocks
The domain must 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
X d i r e c t i o n : 2
Y d i r e c t i o n : 2

The domain is automatically split into blocks of equivalent sizes.

4.1.4.3 BCs Tab

The boundary conditions are defined in the BCs tab. In this case a wall and a symmetry
boundary condition will be used.

By clicking next to each defined boundary condition, it is possible to modify different
parameters at the walls such as the temperature or the heat flux. In this case, no modifications
are required in the basic tab since we only solve for the flow. However, some changes may be
needed in the interface tracking tab. The model used for this simulation does not use a film at
the interface between the wall and the fluids. In TransAT such a model can be achieved by setting
a negative value to the film thickness.

• Next to the Wall BC, click

• Make sure that, in the interface tracking tab, the value of the film thickness is negative.

• Click .

The next step is to assign each surface to the corresponding boundary condition.

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

• Next, select the Xmin0 surface by simply clicking it in the surface

• Check the light grey square at the line corresponding to the Wall boundary condition.

c
Ascomp AG Switzerland 122 Version 5.7