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

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 June 8, 2015, 06:11 moving mesh bc to define the movement of the points through their coordinates #1 New Member   Join Date: Jun 2012 Posts: 11 Rep Power: 5 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!

 June 15, 2015, 06:13 swak4Foam #2 New Member   Join Date: Jun 2012 Posts: 11 Rep Power: 5 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 ( ( 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.

 June 15, 2015, 10:52 #3 New Member   Join Date: Jun 2012 Posts: 11 Rep Power: 5 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 ); #}; }```

 Tags codedfixedvalue, dynamic mesh

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