How to combine static analysis and CFD analysis

Hello, I'm newer to this software. I have some questions for my project using some soft material. 

First, I finished the static analysis. Right now, I would like to put the material in the water, to measure the displacement and velocity as well as the shape change during the material move in the water. And also I will apply the voltage to the material, which will drive the material to move.

How should I define the movement of the material when it moves underwater, since it's a soft material, it will change the shape and size, how should I define the property of the material when I do CFD simulation?

If I just want to analyze the displacement and velocity, do I just need to do the explicit analysis?

Thanks for all your helpful answers and suggestions!


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