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Physics models for turbulent 2D DNS

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Old   June 3, 2015, 09:23
Default Physics models for turbulent 2D DNS
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Oliver Westbrook-Netheton
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I am currently trying to capture the Von Karman street behind a static 2D cylinder at a Reynolds number of 200. At this Reynolds number, the wake its turbulent (http://www.thermopedia.com/content/1...FLOW_OVER_FIG2), I have already simulated the same problem at a Reynolds number of 80 and got good results back.

For this, I selected the same physics models within Star-CCM+ as are stipulated in the Incompressible tutorial for capturing the vortex shedding. Now that the flow is turbulent, I need to select the 'Turbulent' option instead of Laminar but want to implement a DNS. This requires no models for turbulence, but Star-CCM+ will not let me run the simulation without one.

How do I chose the appropriate physics models to implement a '2D DNS'?

Many thanks.
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Old   July 7, 2015, 13:14
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Lucky
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To do DNS, just choose 2D laminar
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