TELEMAC-MASCARET Forum: Problem with Hm0 values in the boundary conditions (1/1)

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TOPIC: Problem with Hm0 values in the boundary conditions

Problem with Hm0 values in the boundary conditions 12 years 7 months ago #4187

matthias

Hello,
I had a problème with the significative hight at the boundary conditions, wich had not the good values.
I read the advice of giovanni in an oformer post and it works.

giovanni.mattarolo wrote:

- concerning the Hm0 value problem, you have to check the frequency interval and the frequency resolution you define in the steering file : it can be that you obtain a Hm0 lower than the value that you impose because the lowest frequency you consider in the spectrum is not low enough compared to the frequency peak. (Rule of thumb : if you have a peak period of about 15s, take the lowest frequency equal to 0.035Hz).

But I would know how is calculate the lowest fréquency to it works.
Is it a fonction of frequencial ratio, or just pic frequency/lowest frequency=2?

Please, could you help me to understand?

Matthias B.

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Re: Problem with Hm0 values in the boundary conditions 12 years 5 months ago #4626

giovanni.mattarolo

Hello,

sorry for the (long) delay of the answer.
In the TOMAWAC steering file you have to set both the lowest frequency and the frequential ratio. A good rule of thumb consists of setting the lowest frequency equal to 0.5*Fpeak. The highest frequency calculated by TOMAWAC is obtained from the FREQUENTIAL RATIO and from the NUMBER OF FREQUENCIES. You must be sure that the frequency spectrum you want to impose is included between the lowest and the highest frequency you set in the steering file.

Kind regards,

Giovanni

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