Learning Forum

[aboa2000]

I am a final year Masters's Student from Heriot-Watt University currently working on my dissertation project titled "A THEORETICAL ASSESSMENT OF THE STRUCTURE OF A LIQUID STORAGE TANK UNDER SEISMIC FORCES" with the following objectives:

1. Verification of Current Theories (Housner, Preethi, and Malhotra) of liquid Structure Behavior (sloshing wave height) under seismic forces for petroleum-filled storage tanks using Finite Element Modelling and Finite Element Analysis.

2. Assessment of the possible failure mechanism of the superstructure of the various liquid storage vessels under exposure to seismic forces using Finite Element Modelling and Finite Element Analysis based on the API 650 Design Standard.

3. Proposal and initial assessment of the effectiveness of a Bass Isolation System on the sloshing wave height using Finite Element Modelling and Finite Element Analysis.

Can the Ansys modal analysis module be used to model a fluid-filled storage tank and determine the sloshing wave height along with the impulsive and convective mass components of the fluid based on the application of specific Acceleration, Velocity, and displacement values?

Can I subsequently transfer the model to the Ansys Static Structural Module to determine the various resulting stresses that will develop within the tank structure due to the seismic forces and the fluid-structure interactions?

If not, can you guys offer any advice on what methodology I should take?

[Erik Kostson]

 

Hi

This artcile should be of help:

Title:

Verification of a Fluid-Structure-Interaction Model for Seismic Analysis of Gen IV Nuclear Power Plants

(LS-Dyna application)

Also this link :

https://www.osti.gov/servlets/purl/1780877

All the best

Erik

 

[aboa2000]

My current proposed modelling process is to model the fluid-filled tank first and carry out a modal analysis on the model in Ansys Modal Module. Those results will then be transferred to Ansys Fluent to determine the fluid-structure interactions based on earthquake data that I have so that I can determine the sloshing wave heights. I will then link the results to carry out a Transient structural analysis of the tank and finally a response spectrum analysis to determine stresses in the tank body.

[Erik Kostson]

Sure you can try that (I can not comment on this approach) .

The papers above describe methods that have been at least verified and used.

of course it is entirely up to you how you going to do this.

In any case I hope those references are of some help.

All the best of luck with your work.

Erik