How to calculate angular drag of rigidbody in water

Unity Engine
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1

I have a rigidbody with following characteristics:

Length = 140 m
Width = 23 m
Height = 5 m
Weight = 11790000 kg

The fluid density is 1025 kg/m^3

Angluar velocity in experiment is 2 rad/sec (y-axis)

Rigidbody is fully submerged in experiment.

I would like to know what formulation to use to calculate the angular drag force in rad/sec for this rigidbody using the date listed above.

Any help with this would be highly appreciated!

2

You might find this useful: fluid dynamics - Angular drag on body - Physics Stack Exchange.

This paper appears to offer an excellent insight: https://simwave.nl/wp-content/uploads/2018/01/10.11648.j.fm_.20170305.12.pdf

The one big problem you have is that your submerged body is of unknown drag/damping coefficient, so this is all going to be rather approximate anyway.

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3

Thanks! I believe the second link has a good solution.

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