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Old   November 20, 2007, 01:35
Default axisymmtric numerical model
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I am getting convergence problem for axisymmetric numerical model for a simple pipe flow problem. the boundary conditions i have used are as follows

at x=0 u=1,v=0 delp/delx=0 delpdash/dx=0

at x=l delu/del/x=0, delv/delx=0 p=0 pdash=0

at r=0 delu/delr=0 v=o delp/dy=0 delpdash/dy=0

at r=R wall

can some one tell, how this ll differ from the code of rectengular co-ordinate.

Now i m trying with changing the area of the face and voulme of the cell and rest all the code is same.

Thank you in advance.
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Old   November 20, 2007, 09:52
Default Re: axisymmtric numerical model
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What is pdash?

You should be solving momentum equations for u and v plus a continuity constraint on the solution that determines the pressure distribution (to within a constant - it's the pressure gradient that matters).
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Old   November 20, 2007, 14:27
Default Re: axisymmtric numerical model
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Thank you OTD for the reply.

Pdash is the correction in the pressure.

I am doing the same solving the continuity and u,v momentum equation in collocated grid using predictor-corrector pressure correction algorithm..

my question was how it differs from the algorithm for cartesian co-ordinate system.

Now for axisymmetric the change i have done is in the area and volume of the cell.

is there anything more other that.....
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