Treating Forcing Frequency as Free Parameter

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Cayden P.
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Joined: Thu Jul 27, 2023 11:34 pm

Treating Forcing Frequency as Free Parameter

Post by Cayden P. » Mon Jul 31, 2023 12:20 pm

Hello,

I am currently attempting to recreate Figure 2 from Sun, Townsend, & Guo (2023). In the paper, it is stated that, in the figure, the tidal forcing frequency σ is treated as a free parameter as opposed to being restricted by equation E26 within that paper. I am struggling to find out how this treatment of σ can be accomplished using gyre_tides. Does anyone know how I can do this?

Regards,
Cayden Peters

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rhtownsend
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Joined: Sun Mar 31, 2013 4:22 pm

Re: Treating Forcing Frequency as Free Parameter

Post by rhtownsend » Mon Jul 31, 2023 12:27 pm

Hi Cayden --

Good question -- this is little buried in the docs, but the way to do this is using the alpha_frq parameter of the &tide namelist group. The inertial-frame forcing frequency used in gyre_tides is

sigma = alpha_frq * k * Omega_orb

...where Omega_orb is the orbital frequency and k the harmonic index.

cheers,

Rich

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