axisymmtric numerical model
 

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.

Re: axisymmtric numerical model
 

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).

Re: axisymmtric numerical model
 

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.....