This function generates plots of fields averaged over the layers in the
mesh. It is a generalised replacement for the postChannel utility, which
has been removed. An example of this function's usage is as follows:
layerAverage1
{
type layerAverage;
libs ("libfieldFunctionObjects.so");
writeControl writeTime;
setFormat raw;
// Patches and/or zones from which layers extrude
patches (bottom);
zones (quarterPlane threeQuartersPlane);
// Spatial component against which to plot
component y;
// Is the geometry symmetric around the centre layer?
symmetric true;
// Fields to average and plot
fields (pMean pPrime2Mean UMean UPrime2Mean k);
}
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