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January 14, 2017, 02:58
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The Definition of T soft
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#1 |
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New Member
Anna
Join Date: Jan 2016
Posts: 21
Rep Power: 10  |
Dear Foamers
I am a new user and I am working on the interaction between waves and breakwatres. I have compiled waves2foam with interDyMFoam and as the result my solver is waveDyMFoam. I have a question about the inputs of irregular waves. I use JONSWAP Spectrum as the irregular waves. In the waveproperties file it needs T Soft, unfortunately I do not know the underlying concept of that. Does anyone know what is T Soft? I appreciate your kindness in advance Best Regards Anna |
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January 15, 2017, 12:58
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#2 |
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Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,901
Rep Power: 37 |
Good evening.
@Anna: Tsoft is the time over which the waves are ramped from zero to the final value. This functionality is present to avoid shocks at t = 0. Kind regards, Niels
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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; August 25, 2018 at 07:11. Reason: removed answers to other posts that were on the main thread |
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January 15, 2017, 14:31
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#3 |
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New Member
Anna
Join Date: Jan 2016
Posts: 21
Rep Power: 10 |
Dear Niels,
Thanks for your quick reply. Unfortunately, the under lying concept of T soft is still unclear for me. I have modeled a irregular waves with JONSWAP Spectrum with (Tf=Tp=1.2 sec) and (Hs=0.045 m) and (N=30). Not only does the maximum of the surface elevation not match with Hs, but also the surface elevation reduces in the length of the flume. I have attached the picture of the mentioned result at two different probes at the specific time(in the next post). Although the Tsoft and Tp are the same at this simulation, I can not solve this problem. It is vague for me this differences. I appreciate your kindness in advance Best Regards Anna |
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January 15, 2017, 14:33
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The Definition of T soft
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#4 |
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New Member
Anna
Join Date: Jan 2016
Posts: 21
Rep Power: 10 |
Dear Niels,
Thanks for your quick reply. Unfortunately, the under lying concept of T soft is still unclear for me. I have modeled a irregular waves with JONSWAP Spectrum with (Tf=Tp=1.2 sec) and (Hs=0.045 m) and (N=30). Not only does the maximum of the surface elevation not match with Hs, but also the surface elevation reduces in the length of the flume. I have attached the picture of the mentioned result at two different probes at the specific time. Although the Tsoft and Tp are the same at this simulation, I can not solve this problem. It is vague for me this differences. I appreciate your kindness in advance Best Regards Anna |
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January 17, 2017, 14:02
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#5 |
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Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,901
Rep Power: 37 |
Good evening,
@Anna: You most likely suffer from numerical diffusion due to too coarse mesh resolution or poorly chosen numerical schemes. 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. |
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