[Trilinos-Users] How best to solve Poisson eq. in cylindrical coordinates

[chris.jackson at mayahtt.com]

I'd also be interested to hear the reply.  We use ML as the preconditioner to BiCGStab for the Poisson problem in Cartesian coordinates, but we have similar slow convergence - presumably for the same reason - when the finite volume cells have large aspect ratios.

Thanks

Chris Jackson

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-----Original Message-----
From: John R Cary <cary at colorado.edu>
Sender: "trilinos-users-bounces at software.sandia.gov"
	<trilinos-users-bounces at software.sandia.gov>
Date: Tue, 27 Dec 2011 10:20:45 
To: Trilinos Users<Trilinos-Users at software.sandia.gov>
Subject: [Trilinos-Users] How best to solve Poisson eq. in cylindrical
 coordinates

In this case, the coefficients of the operator
vary dramatically, as the operator in the radial
direction is

(1/r)(d/dr)(r d/dr) = d^2/dr^2 + (1/r)(d/dr)

We try plain ol' ML and convergence is slow,
like 80 iterations.

Are there suggestions for this?

Thx....John Cary

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