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-   -   Dynamic sloshing and hydrodynamic modeling of liquid storage tank for earthquake (http://www.cfd-online.com/Forums/main/66336-dynamic-sloshing-hydrodynamic-modeling-liquid-storage-tank-earthquake.html)

K i M July 12, 2009 22:54

Dynamic sloshing and hydrodynamic modeling of liquid storage tank for earthquake
 
Namaste to all,
I am doing research work on hydrodynamic effect in liquid storage tank.
Till now, the only thing that I had got that Ansy is only the solution.
The CFD modeling, volume of fluid (VOF). After going through to this forum Open Form could be other option.
Since I am New reader and hoping to get few suggestions.

1. Can free surface modeling of liquid in vessel be done?
2. If so, Will it shows dynamic properties, sloshing
in response to the seismic forces?
3. Will the impact forces could be applied automatically due to movement of liquid?

Do suggest me

KiM

otd July 17, 2009 12:59

I presented a paper at an ASME meeting in Honolulu in 1995. It was very preliminary work. Referee scrutiny was pretty minimal (the hard copy lacked two pages of text and two of figures!!).

I used SOLA-VOF and an acceleration data set located by Dr. Rezvani. The simulation was only two-dimensional. I think the method was pretty straight-forward.

The reference will give you the botched publicatation. I can probably find the complete text if it'll be useful - but it might take a few days. This is very definitely a preliminary look at the problem. I can't distribute the code. But you might be able to get NASA-VOF/2D or /3D. Should be able to start with that. Let me know if the 'complete' paper is of any interest.

otd

Park, James E. and Mohamad A. Rezvani, In-Tank Fluid Sloshing Impact Effects During Earthquakes: A Preliminary Computational Simulation, presented at the joint ASME-JSME Pressure Vessel and Piping Conference, Honolulu, Hawaii, July 24-27, 1995 [in ASME PVP - Vol. 314, Fluid - Structure Interaction, Book No. H00977, Editor: David C. Ma].


Rui July 17, 2009 13:11

A search in Google gives this as the first item: http://www.osti.gov/bridge/servlets/...able/46574.pdf

otd July 17, 2009 16:00

Yes, that's what was published. It lacks two pages of theoretical support and two pages of figures. So it's really not of much use.

Sher July 18, 2009 10:01

free surface
 
Ii am modeling rectangular pond. Can some body suggest me how to model its top as free surface

Rui July 18, 2009 11:27



Sher July 18, 2009 21:05

Free surface modeling
 
Hi, I am modeling hydrodynamics of stormwater retention ponds in New Zealand by using ANSYS CFX 11 as my PhD project. The pond I am studying is a rectangular pond with a depth of 0.23m and dimensions of 4.1m*1.5m. The boundary condition which I have applied are as.
Inlet = mass flow rate
Outlet = Pressure outlet with static pressure zero.
Top = symmetry
all other walls= Wall

but I would like to model the top of the pond as a free surface. Can some body advise me how to do this. I have tried tutorial 7 of Bump.2D but I could not understant how the expressions have been made in this tutorial.

Please advise me how can I make the top surface as a moveable free surface?

Sher Khan Kahloon

K i M July 19, 2009 03:21

Thanks,
I downloaded the paper,
and hope to get more suggestions
2-D VOF is only option I have got, But other the paper are published in 3D manner but they are not saying how.
another fact is that programming is not my option in terms of time and resource.
Our college has ansys and it is only the option otherwise Open Form could be one.
On the basis of the software I have to prepare my thesis.
Thanks

Sher July 19, 2009 18:15

How To model free surface
 
Hi Every body, Please suggest me what should I do to model the free surface. As I mentioned above that I am modeling a rectangular stormwater pond and I would like to make its top as a moveable free surface.

Please please advise me. I have tried many many options but could not do it?
The boundary conditions which I apply are :
Inlet: Mass flow or speed
Outlet static pressure, 0
Top Symmetry, I tried it to model as free surface but I could not do so
Walls walls

Please help me how I can model top as free surface.,

Ahmed July 20, 2009 08:40

Quote:

Originally Posted by Sher (Post 223213)
Hi Every body, Please suggest me what should I do to model the free surface. As I mentioned above that I am modeling a rectangular stormwater pond and I would like to make its top as a moveable free surface.

Please please advise me. I have tried many many options but could not do it?
The boundary conditions which I apply are :
Inlet: Mass flow or speed
Outlet static pressure, 0
Top Symmetry, I tried it to model as free surface but I could not do so
Walls walls

Please help me how I can model top as free surface.,

1- Your query is related to a particular programme, you would get response if you post on the Ansys-cfx forum
2- Have you tried open source alternatives? Gerris (http://gfs.sourceforge.net/wiki/index.php/Main_Page ) or OpenFOAM
3- Have you tried to contact your support engineer?
Good Luck:o:o

K i M July 25, 2009 23:41

Spring mass model
 
The simpler model of liquid tank suggested by ACI code is
http://www.cfd-online.com/Forums/mem...ture37t-12.jpg
Fig1. showing impulsive and convective mass and equivalent spring stiffness
http://www.cfd-online.com/Forums/mem...cture38t-2.jpg
Fig2. Elevated tank model.

Even though It doesn't show true effect of liquid.
Any suggestions on similarities or dissimilarities on spring mass model and liquid FEM modeling are are always welcomed.
KiM

K i M August 21, 2009 03:42

Water sloshing can be simulated using fluent ????
does any one can suggest me detail procedure
Help me out

KiM

phsieh2005 August 21, 2009 09:58

Hi, KiM,

I believe that OpenFOAM can do what you are lookin for.

Run tutorial examples under interDyMFoam.

To include the effect of external forces, you can easily revise the interFoam/interDyMFoam source code to add the force terms in the momentum equation.

You can get more help by asking specific questions in the OpenFOAM forum. But, you should spend some time to understand the file strucutures of OpenFOAM first.

Pei

K i M August 22, 2009 22:12

Thanks,
Pei..


I am skeptical that Open Form is Linux based software !
and I have not tried that one till now although it is my safest option.
what I am really thinking is to use fluent as i have enough tutorial for that.
Using Open form meant starting from scratch.

even though completion of my work is of my prime concern and I have to use any one of them any way.

So regarding to this I would like to have suggestion.

KiM

binu April 22, 2011 22:24

Hi kim,
DO you successfully simulated rectangular pond under external loading in ansys.
i tried it but not succeeded. can you suggest me how to simulate in ansys.
thanks in advance


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