[snappyHexMesh] different snappyHexMesh executiontime for same grid generated from gmsh and blockMesh

Samuel Twain · April 28, 2021, 08:51

Dear all:
Recently I have met an unresonable result. When I use snappyHexMesh to add layers for the "down" patch of two nearly same grids generated from Gmsh and blockMesh, the execution time differs greatly from each other. The expansion rate, total number, minumum size and maximum size of the grids are nearly the same. So are the sizes of the domains. However, it only costs 3.97s for mesh generated from Gmsh to add layers in snappyHexMesh. While it costs 111.46s for mesh generated from blockMesh.
I am so confused by the different execution time spent by the two nearly same meshes, which are just generated in different ways.
Any reply would be greatly appreciated
Best wishes,
Samuel

P.S. As the upload file is limited to 135kb, I have failed to upload these two cases. The zip is about 9.86MB :<

rmaries · May 3, 2021, 02:53

Can you share the pictures of your mesh differences? If possible try to share the file through some other file sharing method and share the link here.

April 28, 2021, 08:51	different snappyHexMesh executiontime for same grid generated from gmsh and blockMesh	#1
Samuel Twain New Member samuel Join Date: Oct 2019 Posts: 15 Rep Power: 6	Dear all: Recently I have met an unresonable result. When I use snappyHexMesh to add layers for the "down" patch of two nearly same grids generated from Gmsh and blockMesh, the execution time differs greatly from each other. The expansion rate, total number, minumum size and maximum size of the grids are nearly the same. So are the sizes of the domains. However, it only costs 3.97s for mesh generated from Gmsh to add layers in snappyHexMesh. While it costs 111.46s for mesh generated from blockMesh. I am so confused by the different execution time spent by the two nearly same meshes, which are just generated in different ways. Any reply would be greatly appreciated Best wishes, Samuel P.S. As the upload file is limited to 135kb, I have failed to upload these two cases. The zip is about 9.86MB :<

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May 3, 2021, 02:53		#2
rmaries Member Maries Join Date: Mar 2010 Location: Cologne, Germany Posts: 75 Rep Power: 16	Can you share the pictures of your mesh differences? If possible try to share the file through some other file sharing method and share the link here.