Here is a test I did for a tent flapping around in a a heavy arctic wind. Nothing beats real life, so I filmed a bed sheet blowing in a wind and then made a black and white video element with it which I then used as a displacement map. The movement is more real thancg wind because- well, it WAS real wind I used ! Here you can see the test and the final shot. Yes those are Poser people walking around.
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