Hsig results

[João Ribeiro]

Hi,

I´m testing funwave in a 30m depth channel and analysing the results for Hsig. However they seem to be higher and different than expected.

Can anyone help me understand how Hsig is calculated?

Best regards,

João

[Fengyan Shi]

In funwave-tvd, the significant wave height is calculated using Hmo = 4 SQRT(<eta^2>), where < > represents averaging.  

In your input.txt

WAVEMAKER = WK_REG

Tperiod = 12.0 

T_INTV_mean = 100.0 

Your model simulates regular waves with T=12s. But Hmo is calculated by averaging (integrating) over every 100s (not divisible by 12). What’s why you got residuals. Using Hrms may be more reasonable, conceptually for regular waves. 

-Fengyan

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<input_reg_canal_30m.txt><HsigQuestion.pptx>

[João Ribeiro]

Thank you for the reply, I understand about the  T_INTV_mean. 

However when looking at Eta it seems to have a reflection from the east sponge boundary? Is this possible? 

[Fengyan Shi]

Yes, it’s the standing wave pattern caused by reflections from boundaries 

On Jul 11, 2024, at 3:52 AM, João Ribeiro <joao.t.t...@gmail.com> wrote:



Thank you for the reply, I understand about the  T_INTV_mean. 

However when looking at Eta it seems to have a reflection from the east sponge boundary? Is this possible? 

<image.png>

[João Ribeiro]

Thank you. 

I am testing several sponges. But still get more or less the same results. How can I minimize this? Are there any best práticas?

Again, thank you for your time.

[Kirby, James T]

That looks like a very narrow sponge compared to the wavelength.

Jim

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