TELEMAC-MASCARET Forum: wrong breaking at coast (1/1)

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TOPIC: wrong breaking at coast

wrong breaking at coast 6 years 7 months ago #29682

Mustermann
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Expert Boarder
Posts: 268
Thank you received: 4

Hello,

I have some strange behavior regarding the wave breaking close to the coast. Firstly the waves collapses in a very steep angle. Secondly the waves comes up again after it is already collapsed.

I will attach my model files here. I know the mesh is a little bad in the north, but I am not that interested in that area.

I already checked the breaking parameters but could not find any problems there.

Thanks in advance.

Attachments:

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wrong breaking at coast 6 years 7 months ago #29689

cyamin
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openTELEMAC Guru
Posts: 997
Thank you received: 234

Hello,

It would provide more information if you could attach your results file. The only advice I could provide, is to do a sensitivity analysis on timestep. Wave breaking usually requires a smaller timestep. You can also add substeps for wave breaking using the keyword NUMBER OF BREAKING TIME STEPS. Read the manual for more information regarding how to calculate the substeps required. I would set it to 3 as a starting point.

Costas

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wrong breaking at coast 6 years 7 months ago #29698

Mustermann OFFLINE Expert Boarder Posts: 268 Thank you received: 4	Hello Costas, The results file is to big to attach here. I attached two pictures which show a part of the results. I will check on the timestep. Regards Clemens Attachments: Screenshot...9-07.png (188KB) image.png (30KB)
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wrong breaking at coast 6 years 7 months ago #29699

cyamin OFFLINE openTELEMAC Guru Posts: 997 Thank you received: 234	It looks like there is something wrong with the water elevation. I would say that the elevation zeroes where Hs zeroes. Do you have water elevation data in your results file? Costas
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wrong breaking at coast 6 years 7 months ago #29700

Mustermann OFFLINE Expert Boarder Posts: 268 Thank you received: 4	No I do not have it in the results file. Will add it and check it, but can not do it before Monday. If you like to I could send you a link to the results file via PM.
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wrong breaking at coast 6 years 7 months ago #29701

cyamin OFFLINE openTELEMAC Guru Posts: 997 Thank you received: 234	No problem, you can PM a link if you like.
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wrong breaking at coast 6 years 7 months ago #29706

cyamin OFFLINE openTELEMAC Guru Posts: 997 Thank you received: 234	Hello Clemens, I did some quick tests and it is definitely the timestep. The following parameters yielded totally acceptable results: TIME STEP =2 NUMBER OF BREAKING TIME STEPS =2 NUMBER OF ITERATIONS FOR THE SOURCE TERMS =1 NUMBER OF TIME STEP = 1350 Regards, Costas Attachments: C_WAV.cas (5KB)
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