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# Simulating a fluid

## Simulating a fluid

(OP)
Here is my dilemma ........

I am designing a large elevated tank (open) and would like to model the tank to verify/check my hand cal's for the reactions on my support columns due to seismic loading.

Which brings me to my question, what is the best way to model the fluid.  I am not concerned with sloshing at this point (will look into the sloshing later).  I would like to model the fluid first as a "jello" like material.

Thoughts, ideas?

Thanks
Replies continue below

### RE: Simulating a fluid

Hi there:

You can do using Arbitrary Lagrangian Eulerian technique using Multi-Material properties of LSDYNA 960.
Mail me if you need details.

All the best
Randy

### RE: Simulating a fluid

This is an easy problem for most of the mainstream solvers.  Not sure if Algor can do it, but you may want to simulate the fluid as an extremely low modulus elastomer.

You could do the full sloshing problem (transient dynamics) in ABAQUS as well as doing natural frequency extractions, or modal dynamics.

First cut, use rubber.  It's incompressible (or actually has about the same compressibility as rubber, about 200,000psi bulk modulus) and has zero modulus.  Zero modulus will probably blow up Algor, so give it some minescule modulus.

### RE: Simulating a fluid

I have found that the hydrodynamic elements in ALGOR work pretty well for what it sounds like you are trying to accomplish.  They are elements which have no shear modulus.  You can assign a density, and a young's modulus.

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