How to add the fluid weight in ANSYS WB

[victorpbr]

Hi,

I'm modelling a horizontal vessel and would like to know how to input the weight of the fluid inside. I tried applying hidrostatic pressure, but the mass of the fluid wasn't added, i checked using the probe of force reaction on the supports.

How could I input this mass to be considered?

 

[Erik Panos Kostson]

"A hydrostatic pressure load simulates pressure that occurs due to fluid weight." (from wb manual, search for hydrostatic pressure)
So no need to add that load again if you doing statics.

If you are doing dynamics though, the mass of the fluid might be important since we have a mass matrix/inertia and thus the mass needs to be captured. There are different ways to do that (add fluid mass), e.g., point mass (most simple way neglecting any fluid structure interaction), include sloshing elements/acoustic element representing the fluid (this includes/models the fluid structure interaction).

 

[victorpbr]

Hi Erik

I`m doing statics, but hidrostatic pressure load simulates only the pressure loading (only differs from pressure loading because pressure is inputed as a function of height), and do not consider the stresses generated by the fluid weight, different things.

As I stated this can be proved by checking the support force reactions, which I did with and without hydrostatic pressure, no change in total load.

 

[karachun]

But hydrostatic pressure loading should consider the stresses generated by the fluid weight. Maybe you input load incorrectly.

 

[L_K]

Check that the zero water level is defined correctly in the hydrostatic pressure.

https://www.simutechgroup.com/tips-...s/158-fea-tips-tricks-ansys-hsfld242-elements

 

[victorpbr]

Managed to get it working. I was seeting hydrostatic acceleration same direction as gravity, when I changed the signal it worked. Loads were very weird before, now its ok. Thank you for your help