Hi,
The proper turbulent model for your CFD study is determined by the facts of your situation, such as Reynolds number, flow complexity, and needed precision. Ansys Fluent includes a variety of turbulence models.
you are analyzing air flow through PVC piping at approximately 8 m/s, if the flow is not too complex and you are mainly interested in the bulk flow characteristics, a standard k-epsilon model might suffice. However, if you need more accurate wall treatment, the SST k-omega model could be a better choice.
Hope this answers your question.
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