cellSet volume across processor.

nago · April 19, 2019, 06:03

hi!

i use OF 2.3.1, want to get cells total volume in cellSet PPP.
i can get it in single-core calculation.
but i can't in parallel calculation.

>>(code i wrote)----------------------------------------------------------------
double vol_PPP = 0;
cellSet ppp(mesh, "PPP");

forAll(mesh.C(),i)
{
if (ppp[i]){
vol_PPP += mesh.V()[i];
Info << "vol_Mesh : " << mesh.V()[i] << " [m3] " << endl;
}
}
Info << "vol_PPP_total : " << vol_PPP << " [m3] " << endl;
------------------------------------------------------------------------

i found function "reduce()" or "sum()", but don't know how to use it in cellSet !

please tell me the way of getting total volume...

regard.

olesen · May 7, 2019, 09:40

You need to specify the reduction operator as well. Eg,

Code:

 scalar vol = ...;  // your loop over cellSet
reduce(vol, sumOp<scalar>());

nago · May 9, 2019, 04:03

Dear olesen,

thank you for your reply.
I could get cellSet-volume by your way !!
Thanks a lot.

nago

April 19, 2019, 06:03	cellSet volume across processor.	#1
nago New Member Join Date: Aug 2018 Posts: 18 Rep Power: 8	hi! i use OF 2.3.1, want to get cells total volume in cellSet PPP. i can get it in single-core calculation. but i can't in parallel calculation. >>(code i wrote)---------------------------------------------------------------- double vol_PPP = 0; cellSet ppp(mesh, "PPP"); forAll(mesh.C(),i) { if (ppp[i]){ vol_PPP += mesh.V()[i]; Info << "vol_Mesh : " << mesh.V()[i] << " [m3] " << endl; } } Info << "vol_PPP_total : " << vol_PPP << " [m3] " << endl; ------------------------------------------------------------------------ i found function "reduce()" or "sum()", but don't know how to use it in cellSet ! please tell me the way of getting total volume... regard.

May 7, 2019, 09:40		#2
olesen Senior Member Mark Olesen Join Date: Mar 2009 Location: https://olesenm.github.io/ Posts: 1,715 Rep Power: 40	You need to specify the reduction operator as well. Eg, Code: scalar vol = ...; // your loop over cellSet reduce(vol, sumOp<scalar>());

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May 9, 2019, 04:03		#3
nago New Member Join Date: Aug 2018 Posts: 18 Rep Power: 8	Dear olesen, thank you for your reply. I could get cellSet-volume by your way !! Thanks a lot. nago