# axisymmtric numerical model

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 November 20, 2007, 01:35 axisymmtric numerical model #1 Lokanath Guest   Posts: n/a 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.

 November 20, 2007, 09:52 Re: axisymmtric numerical model #2 otd Guest   Posts: n/a 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).

 November 20, 2007, 14:27 Re: axisymmtric numerical model #3 Lokanath Guest   Posts: n/a 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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