Page 70 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 2.2. Flow over a group of Buildings

– Mu t / Mu: 100

• Click to save the settings and close the window.

• Now the Outflow BC will be edited

• Click for the Outflow BC and set the following parameters, then click
– Outflow type: Pressure
– Outflow Data Source: From Boundary Conditions

– Outflow Pressure: 0
– Click

• The Wall boundary condition will use the default settings

The boundary conditions will now be assigned to the boundaries:

• Select All Surfaces in the drop-down list.

• Highlight XMIN 0 in the list of boundaries and check Inflow by clicking the light grey square
at the corresponding line in the list of boundary conditions. Click to apply the boundary
condition to the XMIN 0 surface.

• Select XMAX 0 in the list of boundaries. Check Outflow in the list boundary conditions.
Click on to apply the boundary condition to the XMAX 0 surface.
• Select ZMIN 0 in the list of boundaries. Check Wall in the list of boundary conditions. Click
on to apply the boundary condition to the ZMIN 0 surface.

The symmetry boundary condition will now be assigned to all the remaining boundaries.
• Select Symmetry in the list of boundary conditions. Select all the surfaces in the surface
tree which have not been assigned to a boundary condition: they appear with a standard
font. Press the Ctrl key while selecting surfaces to select several surfaces at once. Click
to apply the symmetry boundary condition to these surfaces.

c
Ascomp AG Switzerland 60 Version 5.7