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-   -   Looking for a commerical software to model free surface (http://www.cfd-online.com/Forums/cfx/18342-looking-commerical-software-model-free-surface.html)

Michel Boufadel April 30, 2000 23:59

Looking for a commerical software to model free surface
 
Hi everybody,

As you can tell from my question I am new to this field. I am looking to buy (get licence) a software that can model the following problem 1) Put water in a flask 2) Shake the flask to and fro periodically along one direction (using a shaker).

Note that free surface is present. Ignore turbulence at this stage.

Regards,

Michel

Michel C. Boufadel, Ph.D. Assistant Professor Environmental Engineering Temple University

turboguy May 1, 2000 00:08

Re: Looking for a commerical software to model free surface
 
My recommendation is 'commet'

please visit the comment web page, you can catch the strong capability of commet including the free surface flow.

regards,

turboguy May 1, 2000 00:08

Re: Looking for a commerical software to model free surface
 
My recommendation is 'commet'

please visit the comment web page, you can catch the strong capability of commet including the free surface flow.

http://www.iccm.de

regards,

LI Xinfeng May 7, 2000 08:10

Re: Looking for a commerical software to model free surface
 
I think the best free surface is flow3d,of course the cfx4.3 is a good choice.

turboguy June 11, 2000 12:58

Re: Looking for a commerical software to model free surface
 
I do not agree with your comment. In case of flow-3d,mesh generation is very simple. the CPU time also very fast. But the numerical accuracy is not good.

CFX4.x is just calculate the free surface and used VOF model. It could not calculate the heat transfer between light fluid and heavy fluid of VOF model. It also can not solve the compressible effect in free surface.

Anyway, 'COMET' in the best commercial CFD code till now I have been tried.

The first is ' COMET' 2nd is 'STAR-CD' 3rd is 'Flow-3D'

turboguy.


joecfd July 11, 2000 23:54

Re: Looking for a commerical software to model fre
 
I'm not sure about comet, but flow3d is based on well-established free-surface tracking algorithms which are quite accurate. See Hirt and Nicholls in JFM, 1980 I think. There have been many improvements to these algorithms over the years, in particular by Kothe and co-workers at Los Alamos.

Many people have had a lot of success with these methods, especially for mold filling and water/air flows for example.

Real VOF, by real VOF I mean with a geometric reconstruction of the free surface, is generally the best approach for transient problems. What exactly does this comet do? If it's some sort of sophisticated advection scheme, I'd be suprised if it performed very well in real world situations. If it uses a moving mesh strategy then one is probably limited by the topology of the free surface (i.e. it can't do overturning waves).

I do agree with you that CFX-4 is not optimal for free surface flows.


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