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Turbulence Model for PV Analysis

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Old   May 5, 2011, 22:35
Default Turbulence Model for PV Analysis
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What would be a suitable turbulence model for analysis of Personalised ventilation systems? There will be a jet blown onto a seated human manikin and there'll definitely be boundary layer interaction.

We tried K-e and SST on a validation model of two impingement jets but the velocity decay in the middle region was around 40% of the experimental data.
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Old   May 6, 2011, 02:21
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Did you you do the necessary accuracy check to make sure your validation model was accurate - mesh size, time step, convergence, other physics?

There has been a lot of research done on decay of a turbulent jet. If you dig up the literature you should be able to find the best turbulence model to get the jet decay accurate.
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Old   May 6, 2011, 03:58
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well, it converged to 1e-4 and using auto timestep and the meshing is an ordered grid whenever possible.

But you're right. I'll check out some literature.
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Old   May 6, 2011, 08:15
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Looks like you need to do some validation of your model before you claim the turbulence model is inaccurate; Have a look at the tips here and in the CFX documentation.

http://www.cfd-online.com/Wiki/Ansys..._inaccurate.3F
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