can you simulate viscous surrouding in multibody simulation?

I want to simulatie a robot (fish robot) in viscouse surroudings. I understand how solids interact in simulink multibody. But can i change the surrouding with some viscous material whose paratemeter one can change.

Or is there any other toolbox that one can use?

Answer 1

[Yifeng Tang]

There is an underwater vehicle example that includes hydrodynamic and hydrostatic forces, which I believe will help you get started.

https://www.youtube.com/watch?v=ogSQXPyt504&ab_channel=MATLAB

https://www.mathworks.com/matlabcentral/fileexchange/74931-modeling-and-simulation-of-an-autonomous-underwater-vehicle

[pratik kadam]

The mentioned simulation is in areospace toolbox. Whereas I'm looking for multibody simulation so i can link servo control.

Is this possible using aerospace toolbox?

Can we integrate aerospace toolbox with multibody simulations?

[Yifeng Tang]

Oops, I messed up the video link. This is the example I had in mind:

https://www.youtube.com/watch?v=1NA4uiI3znU&t=9s&ab_channel=MATLAB

You'll of course need some correlation for drag & lift in terms of velocity (and orientation?), in order to apply the right amount of force in the right direction. Multibody won't simulate the fluid itself, but can represent the effects of the fluid as force and moment on the vehicle, if you know what they should be.