Hi,
I'm using DMDA. The LHS of the poisson eqn is fixed, only the RHS changes.
I thought I can't find ex29.c in the current ver of PETSc, so I thought
it's no longer valid. Do I always have to get the jacobian as in ex29 to
solve the Poisson eqn?
What about a good ex. using KSPBCGS to solve my momentum eqn with DMDA?
Thank you.
Yours sincerely,
TAY wee-beng
On 4/11/2015 6:43 AM, Barry Smith wrote:
Are you using DMDA or DMPLEX or some other DM? Does the Poisson equation
change (variable coefficient) or is it a constant coefficient with the same
values for all solves? ex29.c could still possibly serve as a model for the
Poisson subproblem, why do you say it is no longer valid?
Barry
On Apr 8, 2015, at 10:18 PM, TAY wee-beng <[email protected]> wrote:
Hi,
I was following example ex29 in the past to write the code to solve my Poisson
eqn using DM. Now it seems that ex29 is no longer valid. Which example should I
follow now?
Also, I am using KSPBCGS to solve my momentum eqn in the past. Do I need to
change much if I'm now using DM? If so, what is a good example?
--
Thank you
Yours sincerely,
TAY wee-beng
