Learning Forum

[Zeeshan.Ali]

 

I am performing a modal analysis on a pipe structure with the following simplified case:

A cylindrical pipe is partially submerged in water (half-dipped), with water flowing through it. The pipe is 1 meter in length, has an outer diameter of 100 mm, and a wall thickness of 4 mm. The material density of the pipe is 7800 kg/m³.

I do not want to model the water directly in my simulation. Could you please explain how to account for and calculate the added water mass (both inside and outside the pipe) for this analysis?

[Erik Kostson]

 

Hi

There is no easy way (so without modelling the water domain) to do this as this complex.

Best and most common way for this is to use the modal acoustic analysis system as that will account for the fluid added mass.

One needs to model the water inside and outside the pipe and structural pipe as a 3D solid (not as a surface body/ meshed with shell elements).

Many posts on this if you search.

https://innovationspace.ansys.com/forum/forums/topic/structure-added-mass-vibration/

Best wishes

Erik