Page 399 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 10.1. Flow past a backward facing step

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.

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

• Select BCs tab.

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, an inflow is located on X min surface, an outflow on the X max surface, walls on the
Y min and Y max surfaces. Symmetry conditions are applied on the Z min and Z max surfaces.
Below step-by-step instructions are given to define the BCs.

• Ensure the Inflow BC is set in the drop-down as type Inflow

• Click for the Inflow BC

• Fill in the inflow properties:

– Inflow Data Source: From BC
– Inflow Type: Velocity based
– Inflow profile: Laminar
– Inflow Velocity components: u: 0.245 v: 0.0 w: 0.0

• Click to save the settings and close the window

• Proceed similarly as above to set the following boundary conditions.

Name: outflow
Type : Outflow
Properties :
− Outflow Type : Pressure
− Outflow Data Source : From Boundary Conditions
− Outflow Pressure : 0

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