[CellZone]

Dear Reader,

I made a pipe with blockMesh where I want to implement some .stl - surfaces , where I can analyze for example the average pressure , mass flux, mean temperature etc. during my calculations (not in post-processing).

I tried to use the tutorial snappyMultiRegionHeater as help:

First I created a .stl -surface in Ansa. Then I created a dictionary in the constant dictionary called triSurface, where I have put my .stl file

Questions

1) Overall: Do I have to use snappyhexmesh or is it possible to do it without snappy . That means: Do I have to mesh my .stl surface file or is it enough just to create a directory with the .stl file?

2) Since it is only used for analyzing: do I have to create a dictionary in the constant directory with files for turbulenceproperties, RasProperties, ... for the .stl surface? Actually I would not know what kind of entries I should add in those files, because it's just for analyzing data.

3) I am trying to implement the analyzing of the surface in the ControlDict using swak4Foam :

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.4.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
//"libtabulatedHeatTransferMassFlow.so"
libs (
//"libtabulatedHeatTransferMassFlow.so"
"libfieldFunctionObjects.so"
"libsimpleSwakFunctionObjects.so"
"libswakFunctionObjects.so"
"libgroovyBC.so"
);
application rhoPorousSimpleFoam;
startFrom startTime;
startTime 0;
stopAt endTime;
endTime 500;
deltaT 1;
writeControl timeStep;
writeInterval 100;
purgeWrite 0;
writeFormat binary;
writePrecision 6;
writeCompression off;
timeFormat general;
timePrecision 6;
graphFormat raw;
runTimeModifiable true;
　
// ************************************************************************* //
functions
(
PressureBefore
{
type swakExpression;
outputControlMode timeStep;
outputInterval 1;
valueType surface;
surfaceName ControlSurfaceHWTEinlass;
surface {
type sampledTriSurfaceMesh;
surface ControlSurfaceHWTEinlass.stl;
source cells; // What to sample: cells (nearest cell)

interpolate false;
}
expression "p";
accumulations (average);
verbose true;
} 
);

Could this work like this?

Thank you in advance

[akidess]

Originally Posted by CellZone

Could this work like this?

Begs the question that if you worked it out so far, why didn't you just try it?

It is possible to use the STL sampling surface without changes to your mesh (it wouldn't be as useful IMO otherwise). Think of it as giving OF a list of points to probe. You don't need any dictionaries or such for the STL file apart from the sampling command. I haven't used triSurfaceSampling with swak, but your code looks reasonable.

[CellZone]

It's working :-) Thank you for your background information!