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OpenFOAM v2306 preservePatches does not preserve cyclicAMI patches.

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Old   December 19, 2023, 09:12
Default OpenFOAM v2306 preservePatches does not preserve cyclicAMI patches.
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Hello,

I want to keep two AMI patches together in a single processor. In the release notes of OpenFOAM v2112 (here: https://www.openfoam.com/news/main-n...v2112/parallel) it is stated that the preservePatches constraints now supports cyclicAMI patches.

However, when I tried it using OpenFOAM v2306, the AMI patches are not kept in a single processor.


Code:
numberOfSubdomains 8;

method          scotch;


constraints
{
    preservePatches
    {
        type            preservePatches;
        patches         (ami0 ami1);
        enabled    true;
    }
}
attached here: https://i.imgur.com/5wMFYqI.png is a screenshot of two processor regions (only two processor regions are shown but the total is 8 processors). The circular region which contains AMI patches is split between processor0 and processor1 which is not the expected behavior.

PS: the circular region containing the rectangle is rotating, while the external region is fixed (as in any typical sliding mesh simulation).



I appreciate your help.
Attached Images
File Type: jpg decomposed_regions.jpg (58.9 KB, 8 views)
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Old   December 22, 2023, 04:36
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Hi,


The link you provide says: "The preservePatches constraint can be used to keep owner and neighbour cells of coupled patches on the same processor."



This means that, if I understand it correctly, although parts of the coupled patches may be distributed across different processors, the owner and neighbour of each cell will be assigned to the same processor.


You can see this in action in their second screenshot, where the neighbouring cells to the left and right of the green line are coloured the same, i.e. they belong to the same processor.
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Old   December 22, 2023, 05:36
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Quote:
Originally Posted by sylvester View Post
Hi,


The link you provide says: "The preservePatches constraint can be used to keep owner and neighbour cells of coupled patches on the same processor."



This means that, if I understand it correctly, although parts of the coupled patches may be distributed across different processors, the owner and neighbour of each cell will be assigned to the same processor.


You can see this in action in their second screenshot, where the neighbouring cells to the left and right of the green line are coloured the same, i.e. they belong to the same processor.
Thank you very much for your answer

I think that really makes sense now for me. I find it very tricky to read that webpage. I believe they should add a note. I expect everyone who is not reading that carefully to think that this constraint is made to preserve the AMI patches on a single processor.
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