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-   -   Free Surface Flow for Ship (http://www.cfd-online.com/Forums/fluent/32344-free-surface-flow-ship.html)

sam October 18, 2003 07:10

Free Surface Flow for Ship
 
Hello users, i wanted to simulate the wave pattern of a wigely hull using Fluent, pls help me how to do that and send some tips / tutorial or the procedure how i can do that using Fluent. Thank's in advance.

ROOZBEH October 21, 2003 03:28

Re: Free Surface Flow for Ship
 
Hi; You must use a multiphase model includes a surface tracking algorithm. Only VOF option of Fluent provides this model. For wave propagation capturing, 3D simulation is better. I extremly recommend you that try to use a structure grid. With an unstructured grid I do not have some good results. Version 6 of Fluent is more better than old versions. I recommend you for first experience with VOF, that you model dam break. Some results about, are provided in litrature. regards

mateus October 21, 2003 03:39

Re: Free Surface Flow for Ship
 
Hi!

As Roozbeh said...If possible use the newest version of fluent (I've had troubles with previous versions).Go trough tutorial problem and then work your way up...you can find a "dam break problem" in CFD book of Peric...and probabilly an a web page of tu-hamburg (lab for ship technology - or something like that) A structured grid is a must here! Also a 3d problem (I really dont know how could you simplify this to 2D????)

good luck

MATEUS


mateus October 21, 2003 03:43

Re: Free Surface Flow for Ship
 
Hi!

Roozbeh i've lost your mail and also forgoten to answer your question...The value for "n" in turbulent viscosity modification was 10 in my case...(it is considered it should be between 6 and 20...). So your value 10^9 (or something) is way of...

MATEUS

ROOZBEH October 21, 2003 03:56

Re: Free Surface Flow for Ship
 
Hi Mateus; I found you here!!! Right now, I send a single message here. Please read this message. Thanks ROOZBEH

Jon October 21, 2003 13:00

Re: Free Surface Flow for Ship
 
Sam, check out the dam brake simulation on this page: http://www-waterloo.ansys.com/cfx/pr...maxwell496.mpg

More at: http://www-waterloo.ansys.com/cfx/pr...-5/gallery.htm

mateus October 24, 2003 05:29

Re: Free Surface Flow for Ship
 
Hi!

I think you can find some usefull information in:

Azuceta R: Computation of turbulent free-surface flows around ships and floating bodies, PhD thesis, Technical University of Hamburg, Hamburg

or:

Azuceta R., Muzaferija S. Peric M.: numerical simulation of flow around blunt bow model. Proc. Workshop on Numerical Simulation of Two Phase Flows, Ship Research Institute, Tokio 2001

Hope it helps,

Best regards

MATEUS


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