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Calculating time derivative of scalar field

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Old   July 10, 2016, 13:11
Default Calculating time derivative of scalar field
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Jack
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I have an unsteady (time dependent) simulation to be analysed in paraview. I would like to calculate for instance \frac{\partial \rho}{\partial t} but I can't find a good way to do it. I figured there must be a straightforward way to do this as it must be a common task in CFD.

The only way I can think of is to write a python programmable filter that loops over all points, and for each point calculates the time derivative using a finite difference scheme by accessing the time step of a simulation at that point. However this seems like its going to be very slow...
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