How to determine Flow Rate using symmetry

Using SimScale Fluid Flow / CFD
1

If I’m modeling a known flowrate through a circular region and use a symmetry boundary to reduce computational requirements, do I need to also reduce the flow rate input value by half to run the simulation. For example, if I have a 3" pipe with a flow rate of 10 kg/s and then use the symmetry boundary condition…do I change my flow rate to 5 kg/s as the input value? Or does the symmetry feature automatically correct for this and I should still use my known flow rate of 10 kg/s?

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2

Hi there! The flow rate depends on the area of the inlet, so half the surface would require half the initial flow rate. Does this make sense? :slight_smile:

Best regards,
Fillia

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3

Perfect. Thanks for confirming.

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