[MITgcm-support] Using a sponge layer to relax temperature

[Ryan Abernathey]

Just wanted to point out, as a possible alternative, the RBCS package.
http://mitgcm.org/public/r2_manual/latest/online_documents/node237.html

RBCS allows you to relax to model fields to some prescribed field (with a
variable relaxation rate) throughout the whole domain. It is somewhat
simpler to use and understand than OBCS.

If you don't need actual open boundary features (e.g. Orlanski, inflow /
outflow), RBCS is more than adequate for making sponge layers.

-Ryan

On Mon, Mar 2, 2015 at 12:56 PM, Stroman, Ashley <acs08g at my.fsu.edu> wrote:

>  Hi Dustin.
>
>  I have two specific questions regarding my problem:
>
>  1.) Is it possible to use Orlanski for momentum on the boundaries, while
> also using a sponge layer to restore temperature to the initial conditions
> on the boundaries? I’m not sure if both are allowed, and I’ve had no luck
> finding this answer online.
>
>  2.) What is the difference between useOBCSsponge and OBCSsponge_Theta in
> the data.obcs file? My thought is that the latter is specifically used for
> theta while the former is not, but I am not 100% positive. There’s not much
> information on the latter parameter except that it turns on the theta
> sponge along the boundaries, so I’m not sure if the parameter is used, 1)
> what it specifically means, and 2) what is additionally required.
>
>  Thanks.
> Ashley
>
> On Feb 27, 2015, at 8:06 PM, Dustin Carroll <spanishcastlemagik at gmail.com>
> wrote:
>
>  Hi Ashley,
>
>  Can you provide a bit more information on the problem you are having? I
> find that the more specific you are, the easier it is for people to help on
> this support group.
>
>  Section 6.3.1 in the docs (see below) describes how to set up your
> data.obcs file, also look at verification/exp4 for an example w/ open
> boundaries.
> http://mitgcm.org/public/r2_manual/latest/online_documents/node236.html
>
>  If you want to restore your boundaries to the prescribed ICs then you’ll
> need to generate binary files for each boundary that is specified in
> data.obcs,
>
>  Cheers,
> Dustin
>
>
>   On Feb 27, 2015, at 11:56 AM, Stroman, Ashley <acs08g at my.fsu.edu> wrote:
>
> Hello.
>
> I am wanting to use the OBCS package to implement a sponge layer on the
> boundaries to relax temperature to the initial conditions. I am having
> trouble finding what is needed in terms of the data.obcs file as well as
> any any additional binary files for temperature that are required. Can
> someone shed some light on this? Thanks.
>
> Best,
> Ashley Stroman
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