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need help with manifold analysis in fluent

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Old   August 29, 2009, 10:29
Default need help with manifold analysis in fluent
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I'm simulating exhaust manifold of a car engine. I meshed the model without errors.. The part where i'm struck is the boundary conditions..

I really need some guidance for modeling,

The recurring boundary conditions based on the crank angle and the firing order.. Like at a certain crank angle based on the firing order, the boundary conditions have to change to other manifold. like the manifold which was inlet at some time should change as a wall after some crank angle, and the appropriate manifold should be an inlet..

this is where i'm struck... about how to write the recurring boundary conditions to a manifold based on crank angle and firing order..

i really need help with this plzz..
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