Page 216 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 5.2. particleseparator

Blocks

• Click Blocks on the left-hand side of the TransATUI
• Click in the bottom right corner of the TransATUI to display the mesh information

The information panel shows that the single block contains roughly ≈ 200, 000 cells. The mesh
will be adapted to roughly fit the geometry by creating blocks and adjusting their size to fit to
the geometry with the shrinking options in TransAT.

• Click , then enter the number of blocks in the different directions as follows.

• Click to apply the block decomposition

X d i r e c t i o n : 2
Y d i r e c t i o n : 10
Z d i r e c t i o n : 2
CHECK Shrink outside Objects
CHECK Shrink f a c t o r : 0.5

40 blocks have been created and some of them have been resized to fit the geometry (there are
now roughly 132, 000 cells distributed in 40 blocks). See Figure 5.7.

The size of the blocks is parameterised with the Shrink Factor. A Shrink Factor of 0.5
will fit the mesh to the geometry and make sure that the fluid-solid interface is surrounded by at
least 3 cells each side of the interface. This ensures that the fluid-solid interface is well resolved.

BCs Tab
• Click BCs on the left-hand side of the TransATUI.

To see the surfaces of all or each of the boundaries, choose a boundary in the drop-down list at
the top of the BCs tab. One boundary condition of each type is available to be edited and used
from the start. Additional BCs can be created by clicking on . is used to assign a selected
BC to a highlighted surface.

Creating Boundary Conditions:
In this case, we have an inflow at Zmax and pressure outflows at Ymin and Ymax. All other
boundaries need not be specified - they will be considered as symmetry boundaries by the solver.
Firstly, the boundary conditions will be created and defined, then assigned to specific grid planes.

• From the Inflow available, click

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Ascomp AG Switzerland 206 Version 5.7