[MITgcm-support] How to select the thermal expansion coefficient

[万松]

Hi Martin,


I was a little unrealistic in changing tAlpha to get the density I wanted. At first, I just thought of it as a constant, and I did not think of it in relation to stability. Now the problem has been solved in other ways.


Thank you for your answer, sincerely!


-best，
Soong


-----原始邮件-----
发件人:"Martin Losch" <Martin.Losch at awi.de>
发送时间:2021-12-23 21:28:10 (星期四)
收件人: "MITgcm Support" <mitgcm-support at mitgcm.org>
抄送:
主题: Re: [MITgcm-support] How to select the thermal expansion coefficient

Hi Soong,

my guess is that with a larger tAlpha you change the stability  (drho/dr = - rhoConst*talpha d(theta-Tref)/dz) which could make the model unstable.

Did you try with a shorter timestep deltaT?

Martin

> On 23. Dec 2021, at 13:24, 万松 <wansong at stu.ouc.edu.cn> wrote:
>
> Hi,
>
> I'm sorry to bother you with my question! I recently modified the thermal expansion coefficient 'tAlpha' to get the density I want when running the baroclinic model, but the puzzle is that if I use a higher value than the default value ( 2.0E-4 ), the model will crash, can anyone share the solution?
>
> -best,
> Soong
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support

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