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whats the difference between patch and faceZones?

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Old   January 18, 2013, 16:21
Default whats the difference between patch and faceZones?
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I saw these when each is used for determining the flow rate?
"Mass flow examples
Usually OpenFOAM solvers define a face-flow field phi that only has to be summed on patches

type patchExpression;
accumulations (
patches (
expression "phi";
verbose true;
On faceZones this is a bit more complicated as the orientation of the face has to be taken into account:

type swakExpression;
valueType faceZone;
zoneName beforeFilter;
expression "phi*flip()";
accumulations (
verbose true;
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