symmetryPlane slows down computation

joshmccraney · February 11, 2020, 15:01

Hi FOAMers!

I am simulating a case in interFoam, where I create the mesh via snappyHexMesh. Rather than create the entire geometry, I create half, closing it with a wall (all stl files from solid works). When I impose symmetryPlane on this wall, the simulation runs so much slower than if I model the entire geometry and do not exploit symmetry.

Can anyone help? I'm happy to post any info that you ask for, but currently am completely clueless as to why the simulation is taking so long.

HPE · February 11, 2020, 15:27

is it possible for you to attach a test case? difficult to judge otherwise.

joshmccraney · February 11, 2020, 15:40

Absolutely. You can download the entire zip file is here.

From there, to run the case, simply navigate into the "case" directory and execute
>> sh reRunSim.sh

The stl files are located in the "geometry" directory. snappyHexMesh is performed in the "mesh" directory. To run snappy (takes 90 seconds), navigate into the "mesh" directory and execute

>> sh runMesh.sh

Let me know if you see anything glaringly wrong. I appreciate your time!

EDIT: I just ran this same case, but instead of symmetryPlane, I used type patch, and had the conditions identical to that of the tank patch. It still goes slow. Then the issue isn't the symmetryPlane, but something else. Any idea if this is a solidWorks issue or a snappyHexMesh issue?

joshmccraney · February 20, 2020, 13:37

Quote:

Originally Posted by HPE

is it possible for you to attach a test case? difficult to judge otherwise.

Hi HPE, have you been able to check out my case and see what the issue is regarding the meshing and slow computational time?

February 11, 2020, 15:01	symmetryPlane slows down computation	#1
joshmccraney Senior Member Josh McCraney Join Date: Jun 2018 Posts: 220 Rep Power: 8	Hi FOAMers! I am simulating a case in interFoam, where I create the mesh via snappyHexMesh. Rather than create the entire geometry, I create half, closing it with a wall (all stl files from solid works). When I impose symmetryPlane on this wall, the simulation runs so much slower than if I model the entire geometry and do not exploit symmetry. Can anyone help? I'm happy to post any info that you ask for, but currently am completely clueless as to why the simulation is taking so long.

February 11, 2020, 15:27		#2
HPE Senior Member Herpes Free Engineer Join Date: Sep 2019 Location: The Home Under The Ground with the Lost Boys Posts: 932 Rep Power: 12	is it possible for you to attach a test case? difficult to judge otherwise. __________________ The OpenFOAM community is the biggest contributor to OpenFOAM: User guide/Wiki-1/Wiki-2/Code guide/Code Wiki/Journal Nilsson/Guerrero/Holzinger/Holzmann/Nagy/Santos/Nozaki/Jasak/Primer Governance Bugs/Features: OpenFOAM (ESI-OpenCFD-Trademark) Bugs/Features: FOAM-Extend (Wikki-FSB) Bugs: OpenFOAM.org How to create a MWE New: Forkable OpenFOAM mirror

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February 11, 2020, 15:40		#3
joshmccraney Senior Member Josh McCraney Join Date: Jun 2018 Posts: 220 Rep Power: 8	Absolutely. You can download the entire zip file is here. From there, to run the case, simply navigate into the "case" directory and execute >> sh reRunSim.sh The stl files are located in the "geometry" directory. snappyHexMesh is performed in the "mesh" directory. To run snappy (takes 90 seconds), navigate into the "mesh" directory and execute >> sh runMesh.sh Let me know if you see anything glaringly wrong. I appreciate your time! EDIT: I just ran this same case, but instead of symmetryPlane, I used type patch, and had the conditions identical to that of the tank patch. It still goes slow. Then the issue isn't the symmetryPlane, but something else. Any idea if this is a solidWorks issue or a snappyHexMesh issue?