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Wave refliction

Posted Apr 13, 2010, 8:59 a.m. EDT 5 Replies

Moahmed Ramdan
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Haloo i am new user for comsol, i am modeling A buoy floating in swiming pool, i am using 2D Axisymmetry, when i put some load on the bouy its start to creat waves i am studying the behavior for this buoy. and compare it with some result i got it from experiment. THe problem was there a wave refliction and coming back. i try to damp it using out let with all option i have ....still that refliction happend.
and other thing i need to plot it in frequancy domain , should i solve it again in Eigenfrequancy or there is a way to polt the parameters fro postprosses ??


please i realneed u r answer ......
regards

5 Replies Last Post Apr 21, 2010, 5:52 p.m. EDT
Marc Jouan
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Posted: 1 decade ago Apr 13, 2010, 9:20 a.m. EDT
To avoid wave reflexion the best way is to use a perfectly matched layer (PML). unfortunatly, this kind of pml is only available for the structural module (frequency response).For a navier stoke application (i suppose that you use this kind of physic) i miss theoritical background and article. So anybody who have dealt with a wave hydrodynamic reflexion problem is welcomed and invited to share his knowledge...
To avoid wave reflexion the best way is to use a perfectly matched layer (PML). unfortunatly, this kind of pml is only available for the structural module (frequency response).For a navier stoke application (i suppose that you use this kind of physic) i miss theoritical background and article. So anybody who have dealt with a wave hydrodynamic reflexion problem is welcomed and invited to share his knowledge...
Moahmed Ramdan
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Posted: 1 decade ago Apr 13, 2010, 11:06 a.m. EDT
please any help!!
please any help!!
Marc Jouan
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Posted: 1 decade ago Apr 14, 2010, 3:37 a.m. EDT
Just have a look at the model i posted(ricci.pdf). In this model, navier stoke équation is replaced by a potential irrotationnal equation (laplace equation )This kind of equation is easily turned out to an absorbing layer :
you just have to put absorbing coefficient in a way near from the ML principle (second post steeneken.pdf).
waiting for news....
Just have a look at the model i posted(ricci.pdf). In this model, navier stoke équation is replaced by a potential irrotationnal equation (laplace equation )This kind of equation is easily turned out to an absorbing layer : you just have to put absorbing coefficient in a way near from the ML principle (second post steeneken.pdf). waiting for news....

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Moahmed Ramdan
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Posted: 1 decade ago Apr 14, 2010, 8:53 a.m. EDT
Hi Thibault;

thanks for your help i realy apreciated ...i will update my model and update u with my result


regards

Salim
Hi Thibault; thanks for your help i realy apreciated ...i will update my model and update u with my result regards Salim
Moahmed Ramdan
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Posted: 1 decade ago Apr 21, 2010, 5:52 p.m. EDT
haloo

i checked the paper he used modes i dont know from where he got it, he didnt show up the comsol work ...i am still stuck

any help please
notes (I am attaching my model to check )

Salim
haloo i checked the paper he used modes i dont know from where he got it, he didnt show up the comsol work ...i am still stuck any help please notes (I am attaching my model to check ) Salim

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