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January 12, 2012, 03:43 
Modelling wave impacts on offshore simple structure

#1 
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Hugh Fell
Join Date: Jan 2012
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Hi there,
This is my first post so let me know if there is any more information that I need to let you know. I'll start by saying that I am completely new to modelling so please excuse my lack of knowledge in this field. I am currently trying to model unextreme wave impacts on offshore structures using fluid dynamic equations. I am not really sure what kind of variation on linear wave theory I should be using. Any suggestions would be much appreciated. Thanks Hugh 

January 13, 2012, 10:31 

#2  
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Bo Terp Paulsen
Join Date: Oct 2010
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Quote:
When it comes to modelling free surface flows in OpenFoam I would strongly suggest you have look at the waves2Foam utility http://openfoamwiki.net/index.php/Contrib/waves2Foam . I have had great success using the utility for calculating hydrodynamic forces on a circular cylinder from both stream function waves and fully nonlinear irregular waves. The utility comes with at wide range of wave theories; so, have a look at the possibilities and choose the one that suits your application best. Good luck! Best regards, Bo Terp 

May 2, 2012, 05:16 

#3 
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Albert Tong
Join Date: Dec 2010
Location: Perth, WA, Australia
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Hi Bo Terp,
Thanks for your explanation. As for the streamFunction wave theory, is it right that the matlab code ( located at /wave2Foam/application/utilities/misc/matlab/generateStreamFile.m ) should be run to get the required wave coefficients to be filled in waveProperties file? If it is yes, then should I specify wave height H, water depth h and other parameters in generateStreamFile.m? Thanks again.
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Kind regards, Albert 

May 2, 2012, 06:56 

#4  
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Bo Terp Paulsen
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Quote:
Good luck, Bo Terp 

May 4, 2012, 10:47 

#5 
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Albert Tong
Join Date: Dec 2010
Location: Perth, WA, Australia
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Hi Bo Terp,
Would you care to elaborate on EorS and uEorS? I cannot figure out what does that do in the code. Also, is it possible to make "David R. Fuhrman's lecture notes from course 'Linear and nonlinear wave theory' given at TUD" public if you have? Cheers.
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Kind regards, Albert 

May 7, 2012, 03:49 

#6  
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Bo Terp Paulsen
Join Date: Oct 2010
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Quote:
A second type of mean fluid speed is the depthintegrated mean speed of the fluid under the wave in a Lagrangian frame of reference. This definition of the mean fluid speed is related to Stokes's second approximation to the wave speed and is equivalent to defining the mean 'masstransport velocity' or the Stokes drift. Normally this velocity is defied as u_2 or u_S. In the Matlab script EorS is a string acting as a boolean indicating however the mean Eulerian fluid velocity or the Stokes drift is defined. uEorS is a scalar indicating the velocity in the given frame of reference. I do not have the lecture noted by David Fuhrman at hand, but for further reading have a look at the classic paper by J. D. Fenton "The Numerical Solution Of Steady Water Wave Problems", 1988, Computers & Geosciences. Best regards, Bo Terp 

Tags 
linear wave theory, offshore modelling, wave generation 
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