error when running chtMultiRegionFoam in parallel

ClaudineW · September 12, 2024, 10:55

Hello,
I am working with chtMultiRegionFoam. My case works fine with one processor.
I tried to run it in parallel and I have an error.
I write : decomposePar
It is okay.
And then I run my case in parallel :
mpirun -np 40 chtMultiRegionFoam -parallel
And I have that error:
Cannot find file "points" in directory "fluid/polyMesh" in times "0" down to constant
I do not know what it means, what I can do to correct it.

Thank you very much for your help.
Claudine

ClaudineW · September 12, 2024, 11:22

It seems that decomposePar does not do the right job.

ClaudineW · September 12, 2024, 11:26

I work with openfoam10

ClaudineW · September 13, 2024, 04:37

I have solved the problem.

I have to decompose each region separately:
decomposePar -region fluid
decomposePar -region torse
decomposePar -region jambe
decomposePar -region tete
An example is given in the tutorial :
$FOAM_TUTORIALS/heatTransfer/chtMultiRegionFoam/heatExchanger

Yann · September 13, 2024, 04:48

Hello Claudine,

instead of decomposePar, try running:

Code:

decomposePar -allRegions

Yann

EDIT: I didn't see you solved your problem before posting. However -allRegions will save you the hassle of decomposing each region separately

ClaudineW · September 13, 2024, 04:55

Thank you very much.

hconel · April 20, 2025, 05:09

Consider I have, say, the following regions:

- FluidRegion
- SolidRegion0
- SolidRegion1

I have two questions:

Question 1)
If I decompose each one into 2 partitions using decomposePar:

- FluidRegion (2)
- SolidRegion0 (2)
- SolidRegion1 (2)

does the simulation:

- run on 6 cores? i.e.
- Core 0: FluidRegion (partition 0)
- Core 1: FluidRegion (partition 1)
- Core 2: SolidRegion0 (partition 0)
- Core 3: SolidRegion0 (partition 1)
- Core 4: SolidRegion1 (partition 0)
- Core 5: SolidRegion1 (partition 1)

- or run on 2 cores with each core getting a partition from each of the 3 domains? i.e.
- Core 0: FluidRegion (partition 0), SolidRegion0 (partition 0), SolidRegion1 (partition 0)
- Core 1: FluidRegion (partition 1), SolidRegion0 (partition 1), SolidRegion1 (partition 1)

Question 2)
If each of these domains has a small number of cells and I want to assign each of them to a single core and run the simulation on 3 cores, is this possible? If so, how to do that?

September 12, 2024, 10:55	error when running chtMultiRegionFoam in parallel	#1
ClaudineW New Member Claudine Wehrli Join Date: Dec 2017 Posts: 5 Rep Power: 9	Hello, I am working with chtMultiRegionFoam. My case works fine with one processor. I tried to run it in parallel and I have an error. I write : decomposePar It is okay. And then I run my case in parallel : mpirun -np 40 chtMultiRegionFoam -parallel And I have that error: Cannot find file "points" in directory "fluid/polyMesh" in times "0" down to constant I do not know what it means, what I can do to correct it. Thank you very much for your help. Claudine Last edited by ClaudineW; September 13, 2024 at 04:39.

September 13, 2024, 04:37	solution	#4
ClaudineW New Member Claudine Wehrli Join Date: Dec 2017 Posts: 5 Rep Power: 9	I have solved the problem. I have to decompose each region separately: decomposePar -region fluid decomposePar -region torse decomposePar -region jambe decomposePar -region tete An example is given in the tutorial : $FOAM_TUTORIALS/heatTransfer/chtMultiRegionFoam/heatExchanger

September 13, 2024, 04:48		#5
Yann Senior Member Yann Join Date: Apr 2012 Location: France Posts: 1,298 Rep Power: 30	Hello Claudine, instead of decomposePar, try running: Code: decomposePar -allRegions Yann EDIT: I didn't see you solved your problem before posting. However -allRegions will save you the hassle of decomposing each region separately

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September 12, 2024, 11:22		#2
ClaudineW New Member Claudine Wehrli Join Date: Dec 2017 Posts: 5 Rep Power: 9	It seems that decomposePar does not do the right job.

September 12, 2024, 11:26		#3
ClaudineW New Member Claudine Wehrli Join Date: Dec 2017 Posts: 5 Rep Power: 9	I work with openfoam10

September 13, 2024, 04:55		#6
ClaudineW New Member Claudine Wehrli Join Date: Dec 2017 Posts: 5 Rep Power: 9	Thank you very much.

April 20, 2025, 05:09		#7
hconel Member Hüseyin Can Önel Join Date: Sep 2018 Location: Ankara, Turkey Posts: 63 Rep Power: 8	Consider I have, say, the following regions: - FluidRegion - SolidRegion0 - SolidRegion1 I have two questions: Question 1) If I decompose each one into 2 partitions using decomposePar: - FluidRegion (2) - SolidRegion0 (2) - SolidRegion1 (2) does the simulation: - run on 6 cores? i.e. - Core 0: FluidRegion (partition 0) - Core 1: FluidRegion (partition 1) - Core 2: SolidRegion0 (partition 0) - Core 3: SolidRegion0 (partition 1) - Core 4: SolidRegion1 (partition 0) - Core 5: SolidRegion1 (partition 1) - or run on 2 cores with each core getting a partition from each of the 3 domains? i.e. - Core 0: FluidRegion (partition 0), SolidRegion0 (partition 0), SolidRegion1 (partition 0) - Core 1: FluidRegion (partition 1), SolidRegion0 (partition 1), SolidRegion1 (partition 1) Question 2) If each of these domains has a small number of cells and I want to assign each of them to a single core and run the simulation on 3 cores, is this possible? If so, how to do that?