I am trying to plot wall shear stress as a function of time. To do so, I select the fluid.rfl file for time history postprocessing. Then I add the item 'shear stress at the wall' to the variable list. But irrespective of the node (at the wall) I choose, the min and max values are being shown as 'invalid'. When I do a contour plot for the wall shear stress, it shows me reasonable values, but I cannot plot it as a function of time. What could be the reason for this?

This is a known issue (bug report 19895) and has not been fixed. At this point it must be considered a code limitation.

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