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moving mesh bc to define the movement of the points through their coordinates

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Old   June 8, 2015, 06:11
Default moving mesh bc to define the movement of the points through their coordinates
  #1
ALU
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Hi!

For a dynamic mesh I need a boundary condition where I can define the movement of every point of the patch through its point coordinates (for example the z-value).

I would like to use the codedFixedValue boundary condition, but in the code example is only shown how to make time-varying functions.

Any help is appreciated!
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Old   June 15, 2015, 06:13
Default swak4Foam
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ALU
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I'm now trying to use groovyBC to define the movement of the patch points.

Code:
    top
    {    
        type groovyBC;
        valueExpression "vector(toPoint(0),toPoint(0),pts().x)";
        value uniform (0 0 0);
    }
The points on the boundary are moving correctly as defined, but the internal field is not moving.

It works perfectly if I define the list of the points motion myself

Code:
    top
    {    
        type fixedValue;
        value nonuniform List<vector>
(
(    0    0    0    )
(    0    0    5    )
(    0    0    5    )
(    0    0    0    )
(    0    0    5    )
...
)
    }
but I would prefer either to use "codedFixedValue" or "groovyBC" for more flexibility.

Last edited by ALU; June 15, 2015 at 10:54.
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Old   June 15, 2015, 10:52
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  #3
ALU
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I finally got it working using codedFixedValue:

Code:
    top
    {
        type            codedFixedValue;
        value           uniform (0 0 0);
        redirectType    myFixedValue;   // name of generated bc

        code
        #{
            const pointPatch& p = this->patch();
            pointField p0 = p.localPoints();
            vectorField myMotion = p0;
            forAll(p0, i)
            {
                myMotion[i] = vector(0,0,1)*p0[i].x();
            }

            operator==
            (
                myMotion
            );
        #};        
    }
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