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A new option has been added to CFD-ACE+ in version 2007.2
that will allow the user to solve turbulence on a zone by zone basis, i.e. some zones can be specified as laminar while others are specified as turbulent. This is available
for use with all turbulence models in CFD-ACE+.
Usage:
First, activate the Flow and Turbulence modules on the PT tab, then select the desired Turbulence model on the MO --> Turb tab. To deactivate turbulence for certain zones, go to the VC tab and select Turbulence for the
VC Setting Mode. The option to
solve for turbulence in a zone is displayed when a volume is selected. Select all zones where turbulence should not be solved and uncheck the box next to Turbulence (these will be laminar zones), as shown in Figure 1.
Figure 1. Zone by zone turbulence specification in CFD-ACE-GUI
If needed, the turbulence quantities may be specified at the interface boundaries between turbulent and laminar zones. In most cases, this is not required.
Selected Case:
The following driven cavity flow demonstrates this new
feature. The main pipe at the top is
turbulent will the vertical cavity is laminar. A plot of the turbulent viscosity is shown in Figure 2. In the cavity the values are zero as
expected.
Figure 2. Turbulent viscosity shown for the turbulent regions.
This model could have also been used for the airfoil or flat
plate cases. However the user will have
to construct the computational grid so that the interface between zones falls
at the transition location. An example
of a double heat exchanger showing the turbulent zone by zone feature is
available in the V2007.2 release notes.
There were several new turbulence features in
the V2007.2 release. We hope you will
try this or one of the others in your simulation efforts if applicable. For any questions about this user tip or if
you have a topic for a future tip, please contact the customer support staff.
Regards,
Perry Daley
ESI CFD Support Team
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