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- - **Modelling wave impacts on offshore simple structure**
(*http://www.cfd-online.com/Forums/openfoam-pre-processing/96090-modelling-wave-impacts-offshore-simple-structure.html*)

Modelling wave impacts on offshore simple structureHi 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 un-extreme 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 |

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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 |

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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Good luck, Bo Terp |

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 non-linear wave theory' given at TUD" public if you have? Cheers. |

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A second type of mean fluid speed is the depth-integrated 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 'mass-transport 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 |

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