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simulating moving piston

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There are 4 components in my model; blood, blood vessel, brain tissue, and piston

Blood and blood vessel are surrounded by brain tissue and piston crushes down brain tissue with 1mm depth.

When I used different software, I used prescribed displacement and divided one time step into several calculations so that I was able to see the movement of the piston during one time step and visualize stress and strain at each calculation.

But I assume that I cannot do it with comsol in the same manner.

Is there any ideas that I can let piston move 1mm and visualize strains while it is moving ?

Any help will be appreciative.


Jay



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