Learning Forum

[Adamya Dhaker]

Hello!

We are creating a 1-way FSI simulation in which a solid-body deforms inside a fluid domain. The fluid domain doesn't have any inherent flow speed, and we want to simulate an infinite domain. I was thinking of the boundary conditions to be as follows: non-reflecting, 1 pressure outlet and 1 velocity inlet with v=0, and nonslip walls on other sides. Is this correct? Or should the conditions be different?

[Rahul]

Hello 
Could you please share the schematic diagram of your domain?

[Adamya Dhaker]

Hello!

Attached is the diagram of the domain. The curves body is the solid body, and the cube is the fluid domain. The curved body is supposed to be fixed at its lower (larger diameter) end and will deform through the fluid domain. You can think of it as an unfurling of rope/whip. Thank you!

[Rahul]

You can specify the ambient pressure at the openings if it is known.

[Adamya Dhaker]

hello! thank you very much for the reply: except the top part, we basically want to simulate this as an infinite domain. In that case do we also specify the ambient pressure? And if we don't have a velocity inlet condition is it fine?

[Rahul]

If you are just simulating the part of infinite domain, you can use symmetry BCs. 
Refer user guide to know more about boundary conditions: 7.4. Boundary Conditions (ansys.com)