how to initalize an expressionField for the walldistance?

david112 · December 12, 2016, 10:55

Hi Foamers,
I need to compute a field in complex geometries which stores the distance to the nearest wall for the whole field. This is needed for a custom meshing technique for LES. I tried something like:

Code:

alpha2Field {
        type         expressionField;
        writeControl    writeTime;
        writeTime    0;
        fieldName     alpha2;
        expression     "dist()";
        autowrite    true;
    }

unfortunately I am not able to aviod the Error like:

Code:

Creating expression field alpha2 ...Selecting patchDistMethod meshWave
[0] 
[0] 
[0] --> FOAM FATAL ERROR: 
[0] At least one plane coefficient must have a value
[0] 
[0]     From function void Foam::plane::calcPntAndVec(const scalarList&)
[0]     in file meshes/primitiveShapes/plane/plane.C at line 51.
[0]

Im usig OF4.1 on ubuntu 16.04 LTS
I hope someone is able and wants to help me. and cant imagine that its endless complicated.
regards,
David

be_inspired · March 23, 2017, 03:23

Did you solve the issue?
It seems like dist() does not work in OF4 and the approach should be different. dist() worked on OF2.1.1 for me

December 12, 2016, 10:55	how to initalize an expressionField for the walldistance?	#1
david112 New Member David Kinast Join Date: Nov 2016 Posts: 15 Rep Power: 9	Hi Foamers, I need to compute a field in complex geometries which stores the distance to the nearest wall for the whole field. This is needed for a custom meshing technique for LES. I tried something like: Code: alpha2Field { type expressionField; writeControl writeTime; writeTime 0; fieldName alpha2; expression "dist()"; autowrite true; } unfortunately I am not able to aviod the Error like: Code: Creating expression field alpha2 ...Selecting patchDistMethod meshWave [0] [0] [0] --> FOAM FATAL ERROR: [0] At least one plane coefficient must have a value [0] [0] From function void Foam::plane::calcPntAndVec(const scalarList&) [0] in file meshes/primitiveShapes/plane/plane.C at line 51. [0] Im usig OF4.1 on ubuntu 16.04 LTS I hope someone is able and wants to help me. and cant imagine that its endless complicated. regards, David

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March 23, 2017, 03:23		#2
be_inspired Senior Member M. Montero Join Date: Mar 2009 Location: Madrid Posts: 155 Rep Power: 17	Did you solve the issue? It seems like dist() does not work in OF4 and the approach should be different. dist() worked on OF2.1.1 for me