[MITgcm-support] Setting Fixed Top and Bottom Temperature BC's

[Ryan Abernathey]

>
> “Fixed" temperature boundary conditions are actually implemented as fast
> relaxation to a target surface temperature distribution. Setting the
> relaxation time scale the same as the model time step will have the effect
> of fixing the temperature in the upper layer. You can generalize this to
> other boundaries using the RBCS package: Just set the your target
> temperature in the vertical layer just above the bottom and setting the
> relaxation timescale equal to the time step will give you a fixed
> temperature bottom boundary condition.
>

I always wondered if there were any numerical issues with this. Is it
possible to create a numerical oscillation / resonance if your relaxation
timescale is close to your numerical timestep? Or is it known to be stable?

-Ryan



>
> Cheers,
> Christopher
>
> > On Sep 16, 2015, at 12:33 PM, Benjamin Ocampo <rurik at ualberta.ca> wrote:
> >
> > Hi All:
> >
> > I currently running the /verification/rotating_tank example and for this
> example,
> > I wish to modify it by removing the temperature boundary conditions at
> r_inner
> > and r_outer and setting them at the top and bottom
> > (say T(z=0) = 40C and T(z=29) = 10C).
> >
> > Is it possible for this case? Is it also possible to set top and boundary
> > temperature conditions at any coordinate system?
> >
> > Cheers,
> > Benjamin
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>
>
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