how to simulate flow around a swimming fish or diver?

how to simulate flow around a swimming fish or diver? using solidworks flow-express or ANSYS , please if u could guide me to a tutorial I'd be grateful

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I usually use CFDesign for flow with motion analysis (I mean fish swimming motion). It's simple to set up and fast prediction to prove your design concept. Just use oscillation motion type, define you rotational axis, sweep angle, and preview your motion, that's it. However if you have to analysis in more detail , ansys is preferable I think. Flow-express cannot solve the problem like this.

 
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