how to perform Tim averaging of velocity for VTK file having variable number of computational cells

Hi
I have VTK output of CFD analysis and I could not perform time averaging using Temporal statistics for velocity vector components as it shows error ( the number of cells are not constant very time step). The reason that I have variable number of cells every time step is because my simulation was featured with dynamic mesh adaption. How can I do that with this ? I’m aiming to calculate turbulent kinetic energy and it needs to determined the velocity average with time for all time steps.

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You could compute statistics for each timesteps and then accumulate the results manually ?

Would resampling the fields onto a static mesh work?