[snappyHexMesh] parallel SnappyHexMesh patchField entry

insta · September 15, 2014, 10:27

Hello Everyone
Im trying to solve some k-epsilon case for complex terrain.
everything is working fix with one calculation core. The problem arises when I try to parallelize it.
my sequence of commands is:
blockMesh
decomposePar
mpirun -np X snnapyHexMesh -overwrite -parallel

so far so good.

when I run a solver I get this error:
Cannot find patchField entry for name_name

I think that I understand the problem but dont know how to fix it.
My question is how can I automatically move the BC of the snap from the '0' folder to all the '0' folders located in the different processors folders that were created ?

Any help will be appreciated

jokerito · September 16, 2014, 13:34

Hello,

I think you have to reconstruct the Mesh and decompose it afterwards again, because with the new mesh from snappy OF doesn't know the new boundary faces with the boundary conditions. Have a look at this thread:
[#1]

That's my way:

Code:

mpirun -np 4 snappyHexMesh -overwrite -parallel
reconstructParMesh -constant -mergeTol 1E-06
decomposePar -force
mpirun -np 2 taskset -c 0,1 interFoam -parallel

insta · September 17, 2014, 00:52

Hi Jokerito
Thanks for the quick reply

I mannaged to fix the problem by adding manually the missing BC, but its a bit annoying
I hope your suggestion with the 'force' command will work at my case.
I've read the thread you suggest, and Bruno speaks there on some magig BC that fix the problem, I will try to figure it out

best regards
Insta

September 16, 2014, 13:34		#2
jokerito New Member Join Date: Jul 2014 Posts: 22 Rep Power: 11	Hello, I think you have to reconstruct the Mesh and decompose it afterwards again, because with the new mesh from snappy OF doesn't know the new boundary faces with the boundary conditions. Have a look at this thread: [#1] That's my way: Code: mpirun -np 4 snappyHexMesh -overwrite -parallel reconstructParMesh -constant -mergeTol 1E-06 decomposePar -force mpirun -np 2 taskset -c 0,1 interFoam -parallel ajk likes this.

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September 15, 2014, 10:27	parallel SnappyHexMesh patchField entry	#1
insta New Member Join Date: Aug 2011 Posts: 13 Rep Power: 14	Hello Everyone Im trying to solve some k-epsilon case for complex terrain. everything is working fix with one calculation core. The problem arises when I try to parallelize it. my sequence of commands is: blockMesh decomposePar mpirun -np X snnapyHexMesh -overwrite -parallel so far so good. when I run a solver I get this error: Cannot find patchField entry for name_name I think that I understand the problem but dont know how to fix it. My question is how can I automatically move the BC of the snap from the '0' folder to all the '0' folders located in the different processors folders that were created ? Any help will be appreciated

September 17, 2014, 00:52		#3
insta New Member Join Date: Aug 2011 Posts: 13 Rep Power: 14	Hi Jokerito Thanks for the quick reply I mannaged to fix the problem by adding manually the missing BC, but its a bit annoying I hope your suggestion with the 'force' command will work at my case. I've read the thread you suggest, and Bruno speaks there on some magig BC that fix the problem, I will try to figure it out best regards Insta