[waves2Foam] wave height decreases in downstream direction

ashim · March 22, 2015, 14:21

Hi,

I am trying to simulate stokes first order waves in wave tank using waves2Foam in OF2.3.1. But the wave height gradually decreasing as time increase in downstream direction even in relaxation zone. My computational domain (-10 -4 -4) to (7 4 2). My inlet relaxation 7 to -2 and outlet relation zone from 5 to 10 and the wave is generated in negative X-direction. The attached figures are at 1sec, 5 sec and 11 sec respectively. For boundary conditions by I have used waveFlume boundary except the two sides are slip only. I have attached wave Properties input.

I am trying to fixed these problem for last 2 weeks but could not fixed it. I appreciate your any kind of help or suggestion.

Regards,

Alifigure1.jpg

figure2.jpg

Figure3.jpg

waveProperties.txt

CFD-Palma · March 23, 2015, 11:19

Hi Ali,

I think your relaxation zone covers most of your domain, only -2 to -5 is out.
Try reducing the x dimension of each relaxation zone to 0.5 or 1 m and try.
Regards,
Carlos.

ngj · March 23, 2015, 13:08

Good afternoon,

@Ali: It is impossible to assist you with the provided information. Look for instance at the post by Xiantao (Stokesfirst wave profile asymetrical against the still water level??), which offers a lot of information. If you are using turbulence models, you should also include that information.

Kind regards,

Niels

ashim · March 26, 2015, 11:16

Good morning.

@Carlos: Thank you very much. I have reduced the relaxation zone at the both end and kept it 5 m as I will simulate a wave having length 4 m. I tried different mesh density in free surface region and found the accuracy in wave height increase with mesh density.
@Niels: Thank you very much. From the next time I will provide more information when I will post a problem in this forum

Ali

March 22, 2015, 14:21	wave height decreases in downstream direction	#1
ashim Member Ali Join Date: Oct 2013 Location: St John's Canada Posts: 31 Rep Power: 13	Hi, I am trying to simulate stokes first order waves in wave tank using waves2Foam in OF2.3.1. But the wave height gradually decreasing as time increase in downstream direction even in relaxation zone. My computational domain (-10 -4 -4) to (7 4 2). My inlet relaxation 7 to -2 and outlet relation zone from 5 to 10 and the wave is generated in negative X-direction. The attached figures are at 1sec, 5 sec and 11 sec respectively. For boundary conditions by I have used waveFlume boundary except the two sides are slip only. I have attached wave Properties input. I am trying to fixed these problem for last 2 weeks but could not fixed it. I appreciate your any kind of help or suggestion. Regards, Alifigure1.jpg figure2.jpg Figure3.jpg waveProperties.txt

March 23, 2015, 13:08		#3
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,903 Rep Power: 37	Good afternoon, @Ali: It is impossible to assist you with the provided information. Look for instance at the post by Xiantao (Stokesfirst wave profile asymetrical against the still water level??), which offers a lot of information. If you are using turbulence models, you should also include that information. Kind regards, Niels __________________ Please note that I do not use the Friend-feature, so do not be offended, if I do not accept a request. Last edited by wyldckat; October 8, 2018 at 10:13. Reason: removed answer to another post that was on the main thread

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March 23, 2015, 11:19		#2
CFD-Palma Member carlos Join Date: Apr 2011 Posts: 37 Rep Power: 15	Hi Ali, I think your relaxation zone covers most of your domain, only -2 to -5 is out. Try reducing the x dimension of each relaxation zone to 0.5 or 1 m and try. Regards, Carlos.

March 26, 2015, 11:16		#4
ashim Member Ali Join Date: Oct 2013 Location: St John's Canada Posts: 31 Rep Power: 13	Good morning. @Carlos: Thank you very much. I have reduced the relaxation zone at the both end and kept it 5 m as I will simulate a wave having length 4 m. I tried different mesh density in free surface region and found the accuracy in wave height increase with mesh density. @Niels: Thank you very much. From the next time I will provide more information when I will post a problem in this forum Ali