Page 40 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 1.3. Flow over a Cylinder (Re=20)

BCs Tab
The boundary conditions will now be set. An inflow will be defined at the X min boundary, and
an outflow at the X max boundary. Other boundaries will be defined as symmetry conditions.

• Ensure the Inflow BC is available, and make sure its type is Inflow. Click to define its
parameters. In the Basic tab, define the following properties:

– Inflow Data Source: From BC
– Inflow Type: Velocity based
– Inflow profile: Constant
– Inflow Velocity components: u: 0.002 v: 0.0 w: 0.0

– Click to save the settings and close the window.

• Confirm that the Outflow BC has a type of Outflow. Click . Define the outflow model
as follows:

– Outflow type: pressure
– Outflow Data Source: From Boundary Conditions
– Outflow pressure: 0

– Click to save the changes and close the window.

• Select X Min in the drop-down list and select the Xmin0 surface in the surface list below.
• Check the Inflow boundary condition in the list of boundary conditions by clicking the light
grey square at the corresponding line. Then, click to apply the boundary condition to
the Xmin0 surface.

• Select X Max in the drop-down list and select the Xmax0 surface in the surface list.

• Check the Outflow boundary condition in the list of boundary conditions then click to
apply the boundary condition to the Xmax0 surface.
• Select All Surfaces in the drop-down list and tick the Symmetry boundary condition in the
list of boundary conditions.

• To assign all the remaining surfaces at once, press on Ctrl while selecting the surfaces that
have not been assigned to a boundary condition in the surface list (they appear in white in
the list of boundaries).

• Click to apply the boundary condition to these surfaces.

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