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Old   December 17, 2014, 12:39
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sunil
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Hello Sir,
I am modelling buoyancy induced transient flow in an Air cavity and for that i am using Bossiness approximation. For steady state flows, we use to consider Average domain temperature as a buoyancy reference temperature which is constant. My question is, is it we need to considered constant buoyancy reference temperature for transient flow and what should be the buoyancy reference location.

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Suneel
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Old   December 17, 2014, 18:30
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Glenn Horrocks
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For transient simulations use a reference temperature which is in the middle of the range of temperatures you expect to see over the course of the simulation, and a reference point in a region where the flow is simple.

The precise choice of reference temperature and point should not be important. You should be able to change it by quite a bit and it makes no difference to the simulation result.
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boussinesq approximation, buoyancy flow, reference temperature

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