[MITgcm-support] Open Boundary Conditions in MITgcm

[fancer fancer]

Hi Jody, thanks for reply. Sorry for belated answer.

Thanks for interesting method. I'll try it. I'll write about results.
You could take obcs_calc.F file from pkg/obcs directory, modify velocity
therein, then put it in code (-mods) directory, without changing Orlanski
code. For example, varification/internal_waves.

Yours cincerely, Serge Semin.

On Fri, Feb 25, 2011 at 1:42 AM, Klymak Jody <jklymak at uvic.ca> wrote:

> Hi Serge,
>
> I use the Orlanski condition, but it really doesn't work except for trivial
> waves.  So what I really do is make the boundaries far from my domain of
> interest and then use the obcs_sponge to drive the boundaries how I want.  I
> usually just do U or V and drive T (and S if I ever used S) to the reference
> value.  Somewhat annoyingly I set the boundary velocities in the Orlanski
> code.
>
> I keep thinking that it would be worthwhile for someone with coding chops
> to add to obcs package the option to specify lateral boundary conditions,
> perhaps even reading them from a file.  I'd be interested to hear how other
> people do it.
>
> Cheers,   Jody
>
>
>
>
> On 2011-02-23, at 11:31 PM, Martin Losch wrote:
>
> > Serge,
> >
> > you might have noticed that the documentation of the obcs-pkg is
> incomplete:
> > <http://mitgcm.org/public/r2_manual/latest/online_documents/node236.html
> >
> > but can find all the information about the OB_Ieast etc. indices and
> other run-time parameters. For more you'll have to consult the code in
> pkg/obcs and the corresponding experiments in verification I am afraid.
> >
> > There is a orlanski-radiation conditions. To turn it on you need to
> re-compile with
> > #define ALLOW_ORLANSKI
> > in OBCS_OPTIONS.h and useOrlanskiNorth/South/East/West=.true. for the
> boundary of intererst. There are some experiments that use this option (e.g.
> tutorial_plume_on_slope, dome). If you are not happy with that, you'll need
> to implement something on your own.
> >
> > I hope this helps,
> > Martin
> >
> > On Feb 20, 2011, at 5:12 PM, fancer fancer wrote:
> >
> >> Hello, MIT gcm support.
> >> I am novic at modeling with MIT gcm, thus I have several questions about
> this model and about obcs package, especially.
> >>      • My first application describe itnternal waves propagation,
> generated by temperature and salinity stratification, in 2D area. This is
> the trivial task, because MIT gcm has internal waves verification example.
> It is necessary, what waves go through boundaries, but not reflect of that
> boundaries. How made it with obcs package or with other way? I made many
> experiments, but whitout positive results.
> >>      • Is there more detailed information about open boundies setting in
> MIT gcm, it is desirable with picture, where OB_Ieast, OB_Iwest, OB_Jsouth,
> OB_Jnorth represented in a modeling area?
> >> In advance, thanks for help.
> >> Yours sincerely, Serge Semin.
> >> P.S, Sorry for my emglish, I'm still learning.
> >> _______________________________________________
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> >> MITgcm-support at mitgcm.org
> >> http://mitgcm.org/mailman/listinfo/mitgcm-support
> >
> >
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