convergent channel -- CFD Online Discussion Forums

March 12, 2014, 07:47

convergent channel

mojijoon

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Join Date: Jan 2014

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I am trying to model unsteady flow of gas at low speed in a convergent channel with finite volume method, using unstructured and co-allocated grid, with SIMPLE algorithm. But the answers from my code are diverging and I don't know what causes the problem.
I only consider the flow in 1 direction. Is this a wrong assumption?
velocity does not change respect to $\theta$ so the grids become 2D, but when I want to calculate the area of faces I use area of 3d shape and for the normal vector I consider a 2D shape. Is it wrong? should I create a 3D grid regardless of velocity component?

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Last edited by mojijoon; March 12, 2014 at 14:21.

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