[blockMesh] blockMesh for 20M grids, stuck forever?

ripperjack · August 13, 2013, 16:41

Hi guys,

I want to generate mesh with 20 million grid points using blockMesh. However, I tried for many times and I failed. I uses blockMesh and now it has taken for more than 5 hours, and the mesh is not successfully generated, I am still waiting..... Could you guys tell me is there a better way to generate big mesh using blockMesh? Thanks!

nimasam · August 14, 2013, 01:14

well you may want to generate your mesh with coarser mesh, then using refineHexMesh or refineMesh, to make it refine to the level you want

kwardle · August 21, 2013, 10:58

refineHexMesh can also be run in parallel, so you could make a mesh with blockMesh, decomposePar, and then refine in parallel to your desired level.

Bernhard · August 21, 2013, 11:36

How much RAM memory do you got on your machine? Probably blockMesh is eating everything, and evading to some swap-memory, which makes it terribly slow. If this is the case, try running on a machine with more RAM.

August 13, 2013, 16:41	blockMesh for 20M grids, stuck forever?	#1
ripperjack Member Jack Join Date: Dec 2011 Posts: 94 Rep Power: 14	Hi guys, I want to generate mesh with 20 million grid points using blockMesh. However, I tried for many times and I failed. I uses blockMesh and now it has taken for more than 5 hours, and the mesh is not successfully generated, I am still waiting..... Could you guys tell me is there a better way to generate big mesh using blockMesh? Thanks!

August 14, 2013, 01:14		#2
nimasam Senior Member Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24	well you may want to generate your mesh with coarser mesh, then using refineHexMesh or refineMesh, to make it refine to the level you want fabian_roesler, ripperjack and mgg like this. __________________ My Personal Website (http://nimasamkhaniani.ir/) Telegram channel (https://t.me/cfd_foam)

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August 21, 2013, 10:58		#3
kwardle Senior Member Kent Wardle Join Date: Mar 2009 Location: Illinois, USA Posts: 219 Rep Power: 21	refineHexMesh can also be run in parallel, so you could make a mesh with blockMesh, decomposePar, and then refine in parallel to your desired level.

August 21, 2013, 11:36		#4
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	How much RAM memory do you got on your machine? Probably blockMesh is eating everything, and evading to some swap-memory, which makes it terribly slow. If this is the case, try running on a machine with more RAM.