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Deformation with constant volume

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I am currently doing bulbous bow optimization by using FFD. But i unable to figure out how do i alter the shape of the bulbous bow but maintain the volume. For example, i would like to extend the length of the bulbous bow but it will affect the volume of the bulbous bow. I hope anyone could give me any idea in this. 

Thank you in advance. 

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Hi Christina,

what you need is a design variable that gives you control over the volume, without changing the length. i.e. the beam of the bulbous bow should work fine. You then need to set up a nested optimization (for example a Brent) that adjusts the beam to match the target volume. You should find plenty of material about these so called "nested optimizations" if you search the forum. 


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