peteroznewman
posted this
01 December 2017

- Last edited 01 December 2017
When you say 30 degrees from the horizontal axis, do you mean up 30 degrees and back down to 0 degrees? What is the period of motion in seconds for one cycle of up/down?

I know about structures, but am a beginner on Fluid-Structure-Interaction (FSI), but one thing I recall is you get to choose if you want a one-way FSI or a two-way FSI.

A one-way FSI would be where the structure deforms then the fluid follows the structure walls. A more typical one-way FSI is where the fluid flow is solved first, then the pressure from the flow is applied as a load to the structure to see how much it has deformed, but those are steady state analyses.

A two-way FSI is where the forces of the fluid flow deform the structure as well as the effect of a rotational displacement of the tip. I think this is where you will end up building the model.

I can imagine a Transient Structural system that applies a sine wave rotational displacement on the tip with an amplitude of 30 degrees. The material properties of the tube (density and modulus) and its diameter and wall thickness as well as the density of the fluid will determine the dynamic response of the system, but if the period is long, the tube deformation will be close to the static solution.

I expect a member with some deep FSI knowledge will have a comment.