
[Sponsors] 
November 29, 2012, 04:05 
Problem in generating linear Wave !?

#1 
New Member
hoannv
Join Date: Apr 2011
Posts: 8
Rep Power: 7 
Dear all,
I am trying to generate linear Wave in CFX,.. I all so make following conditions: @Inlet : i applied velocity at Ui and Vi ; and Fluid Values: water= WaterI @Outlet: Relative Pressuer is Hypers, Fluid value is Zero gradient WaterI = if(y<WaterSurface, 1, 0) Hypres= if(y >WaterSurface, 0[Pa], (9971.185)*g*(WaterSurfacey)) WaterSurface = 0,5*H*Cos(2*pi*(x/Lt/T)) Ui = pi*H /T *cosh(2*pi*(y+d)/L )*cos(2*pi*(x/L t/T))/cosh(2*pi*d/L ) Vi = pi*H /T *sinh(2*pi*(y+d )/L )*sin(2*pi*(x/L t/T))/sinh(2*pi*d /L ) H: wave height L: wave length T wave period d: mean water depth But, my result is nonreasonable,... Pls ponit me what is wrong ? thank and sorry for my English 

November 29, 2012, 17:20 

#2 
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,090
Rep Power: 94 
If you want us to help you, you will have to describe what happened. What is not reasonable about it?


November 29, 2012, 21:33 

#3  
New Member
hoannv
Join Date: Apr 2011
Posts: 8
Rep Power: 7 
Quote:
Followings describes my problem, The result is nonreasonable and i dont understand it pls let me know what is wrong here ! Many thank and Brg 

November 30, 2012, 11:20 

#4 
New Member
Peter
Join Date: Sep 2011
Location: Germany
Posts: 28
Rep Power: 6 
First seems like you didnt initialise the model. For 2Phase transient flow it is necessary to define the area of water before the simulation. I did this 2D numerical wave channel thing in Fluent a couple of years ago, so the main problem is not to generate the waves, it is to get the waves out of the model. Fluent supported this with sth called numerical beach treatment, maybe you have similar functions in CFX. No ideas if your formulas are right but you have to differentiate between shallow and deep water waves, which you will find with the right formulars in every good book about free surface/open channel flow


December 3, 2012, 23:13 

#5  
New Member
hoannv
Join Date: Apr 2011
Posts: 8
Rep Power: 7 
Quote:
Imagine define my model, CFDOnline.ccl define boundary condition i made... pls see and correct it Thank so much ! 

Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Waves2Foam Related Topics  ngj  OpenFOAM Running, Solving & CFD  1259  Today 08:00 
How to plot the wave contour in ship flow (free surface) problem  deddy1973  CFX  6  February 19, 2013 06:49 
generate linear wave in fluent  happyqj  FLUENT  1  March 18, 2012 05:25 
Help! Compiled UDF problem 4 Wave tank tutorial  Shane  FLUENT  1  September 3, 2010 02:32 
problem in solving "wave generation" problem  san  FLUENT  2  April 3, 2006 23:37 