Is there a way to compute only the wetted area of a body in a free surface calculation? By wetted, I mean where the volume fraction > 0.5.

Yes, the wetted area of a body is equal to:

areaInt(Water.Volume Fraction)@Body

You can calculate this in CFX-Post through the function calculator or write an expression in CFX-Pre if you want to track the value or use it to define other quantities.

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