[MITgcm-support] How to reduce a reflection wave from OBCs!

[Van Thinh Nguyen]

Hi Dmitri,

Thanks so much for your hints, I will try and let you know lateron!

Van Thinh
----------

On Fri, 10 Feb 2006, Dmitri Leonov wrote:

> Hello Van Thinh,
>
> I've used sponge boundary conditions for a similar problem. My data.obcs file 
> looks like this
>
> &OBCS_PARM01
> OB_Iwest=1,
> OB_Ieast=-1,
> useOBCSsponge=.TRUE.,
> &
>
> &OBCS_PARM03
> spongeThickness=10,
> # inverse relax. coef's (seconds)
> Urelaxobcsinner = 0.0,
> Urelaxobcsbound = 32.0,
> Vrelaxobcsinner = 0.0,
> Vrelaxobcsbound = 32.0,
> &
>
> You may want to try it.
>
> Dmitri
>
>
> Van Thinh Nguyen wrote:
>
>> Dear all,
>> 
>> I would like to simulate internal waves generated by tidal forcing over a 
>> depression bump in a open channel (opened at east & west). My case is 
>> similar to exp4, but it's limited in 2D. The tidal current is from the East 
>> to West with u=Uo*sin(omega*t). At west and east OBCs I set:
>> 
>> OBWu=Uo*sin(omega*t)
>> OBWv=0.
>> OBWt=tRef
>> OBWs=sRef
>> 
>> OBWw=0. for nonhydrostatic
>> OBWeta=Eta=0.
>> 
>> At Eastern OBC is set the same above.
>> 
>> I extended the length of domain from 60km, 120km, ...
>> the depth of domain H=80m (shallow), depth of bump=50%*H.
>> 
>> I got refection waves from both OBCs, because Temperature profile 
>> (linearized in depth) is fixed at these OBCs (always =tRef), however the 
>> temperature profile in inner domain has changed.
>> 
>> Anyone may have an idea to help me to fix this problem?
>> 
>> Thanks so much for your helps,
>> 
>> Van Thinh
>> 
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>
>
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