Evaluate standard deviation of element size h
Posted Oct 26, 2020, 9:45 AM EDT General, Mesh, Results & Visualization Version 5.5 2 Replies
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I consider a 3D model with a free tetrahedral mesh. I calculate the average of the element size h via "Derive Values" --> "Volume average". This part works. Now I would like to calculate the standard deviation of the element size, but I couldn't find out how to use the expression correctly. Comsol has already provided the template which I found via "add expressions":
stddev(op, expr) -> Standard deviation of op(expr, ...)
The first argument of stddev() has to be a string due to diverse error messages I got. Does anyone know what I need to write instead of "op"? Thank you for your help.