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NEED HELP with Turbulant and laminar flow modeling

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Old   November 2, 2006, 08:39
Default NEED HELP with Turbulant and laminar flow modeling
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Good morning everyone,

I am trying to model a system that cools a hot fluid by circulating air. However, I am not sure how to model both turbulance and laminar model together in one? Any suggestion?

Thank you very much. Muluwork G.
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Old   November 3, 2006, 03:20
Default Re: NEED HELP with Turbulant and laminar flow mode
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If the two fluids are circulating in separate areas (like in a radiator or heat exchanger), then your problem is easy: simply define separate "fluid" zones in Gambit for the two fluid areas, and in Fluent, in "Boundary Conditions" GUI panel, check "Laminar Zone" option for the fluid zone that you need to be laminar. But all this is valid if there is a wall separating the two zones, the fluids do not come in contact to each other directly. If the fluids intimately mix, then I don't know how you could clearly separate the fluid regions to be able to use this "trick".

This option is actally intended for fixating laminar-to-turbulent transition point/line on an airfoil/aerodynamic body, etc.

Are you sure that the flow is laminar in a certain area?

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