Create `calculate_velocity_moments()` function for moments in the laboratory frame
So far the velocity moments are only calculated in the rotating frame using the function calculate_velocity_moments()
.
For analysis purposes it is easier to calculate velocity moments in the laboratory frame where the grid does not rotate.
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Add a function calculate_velocity_moments()
which returns velocity moments in the phyiscal frame instead of the rotating frame.
The functions could be distinguished e.g. using a tag.
The following discussion from !116 (merged) should be addressed:
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@mrath started a discussion:
Add
calculate_velocity_moments()
for a physical frame; Utility Function to switch between frames might be useful. -> physical2rotating, rotating2physical