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.

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).

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.....