[petsc-users] Two DMDAs for conjugate heat transfer

Xiao, Jianjun (IKET) jianjun.xiao at kit.edu
Tue Apr 15 12:09:29 CDT 2014

Dear Barry,

Yes, I have structured grid.

Say, we totally have one million cells (100*100*100). 100,000 cells are solid cells, and the shape of the solid is irregular. The other cells are fluid cells.

In principle, we could use one DMDA. And give the property to each cell. It means the code knows which cell is solid and which is fluid. Then the problem of load balancing occurs: if all  the solid cells accumulates, say at a corner, the work load will not be balanced.

Maybe you have some other good ideas. Thank you

From: Barry Smith [bsmith at mcs.anl.gov]
Sent: Tuesday, April 15, 2014 6:30 PM
To: Xiao, Jianjun (IKET)
Cc: petsc-users at mcs.anl.gov
Subject: Re: [petsc-users] Two DMDAs for conjugate heat transfer

   DMDA are for structured grids. That is each DMDA represents a structured grid. Do you have fluid everywhere and solid everywhere or are some cells fluid and some cells solid?


On Apr 15, 2014, at 11:12 AM, Xiao, Jianjun (IKET) <jianjun.xiao at kit.edu> wrote:

> Dear developers,
> I am writing a CFD code to simulate the conjugate heat transfer. I would like to use two DMDAs: one is for the fluid cells, and the other one is for the solid cells.
> Here are the questions:
> 1.  Is it possible to have two different DMDAs for such a purpose? How the data in these two DMDAs communicate with each other? Are there any similar examples?
> 2.  How to deal with the load balancing if DMDA is used? Or it is simply impossible?
> Thank you.
> Best regards
> JJ

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