Page 84 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 2.3. Flow in an obstructed pipe

Blocks
The Blocks tab will be used to create the block mesh refinement (BMR) and decompose
the domain into several blocks, so that the simulation can run in parallel (i.e. on several proces-
sors). Indeed, each block is allocated to one processor (but a processor can handle several blocks).

With BMR, blocks with finer meshes are created to get a better resolution around areas of
interest. In this case, refinement are defined in the vicinity of the internal disk of the pipe.

• Select Blocks to define the multi-block option.

• Click to cut the domain into several computational blocks.

• Choose 2 for X direction then click

The domain is automatically cut into blocks of equivalent sizes.

To create a block with a finer mesh around the object

• Click
• Enter the following values in the Add Son Block window then click

X Min: 0.15
X Max: 0.35
Y Min: −0.05
Y Max: 0.05
Z Min: −0.05
Z Max: 0.05
X r a t i o : 2
Y r a t i o : 2
Z r a t i o : 2

BCs Tab
The BCs tab allows the user to assign boundary conditions for each of the surfaces present in
the domain. A list of the surfaces present in the domain can be seen by selecting All surfaces in
the drop-down menu. The appropriate setup for this simulation requires 2 boundary conditions
in total.

• Select the BCs tab

• One of each type of boundary condition are already available at the start.

• This tutorial will edit from the Inflow and Outflow BCs available.

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Ascomp AG Switzerland 74 Version 5.7