Strange Problem DecomposePar and SurfaceSampling

FlyBob91 · July 17, 2017, 19:37

Hello to all,
I've just faced a strange problem.
I have to run my simulation in parallel and here i have no problem. I use the scotch method. Then i have to extract the velocity profile over a patch so i wrote the following part in controlDict

Code:

functions
{
	surfaceSampling
	{

 		type surfaces;

		functionObjectLibs ("libsampling.so");
		enabled         true;
		outputControl   onEnd;
		interpolationScheme cellPointFace; 

		surfaceFormat    foam;  

		fields
 		(
  			U
		);

		surfaces
		(
			outlet
			{
				type patch;
				patches	("outlet");
				interpolate     false;    
				triangulate     false;
			}
		);
	}
}

its function is to extract the velocity profile from the patch "outlet".
I noticed in the file created by the surface sampling utility that its elements are fewer than the number cells at the patch, while, when i don't use the parallel computetion, they are the same.
I think this problem is up to the domain decomposition.
So, how cai i use the surface sampling after reconstructPar?

Thanks for help

FlyBob91 · July 18, 2017, 04:33

My question is also: is there a command from terminal that let me do the same operations of surfaceSampling?

July 17, 2017, 19:37	Strange Problem DecomposePar and SurfaceSampling	#1
FlyBob91 Senior Member Join Date: Mar 2016 Location: Bergamo Posts: 157 Rep Power: 10	Hello to all, I've just faced a strange problem. I have to run my simulation in parallel and here i have no problem. I use the scotch method. Then i have to extract the velocity profile over a patch so i wrote the following part in controlDict Code: functions { surfaceSampling { type surfaces; functionObjectLibs ("libsampling.so"); enabled true; outputControl onEnd; interpolationScheme cellPointFace; surfaceFormat foam; fields ( U ); surfaces ( outlet { type patch; patches ("outlet"); interpolate false; triangulate false; } ); } } its function is to extract the velocity profile from the patch "outlet". I noticed in the file created by the surface sampling utility that its elements are fewer than the number cells at the patch, while, when i don't use the parallel computetion, they are the same. I think this problem is up to the domain decomposition. So, how cai i use the surface sampling after reconstructPar? Thanks for help

July 18, 2017, 04:33		#2
FlyBob91 Senior Member Join Date: Mar 2016 Location: Bergamo Posts: 157 Rep Power: 10	My question is also: is there a command from terminal that let me do the same operations of surfaceSampling?