[MITgcm-support] only eta as open boundary ?

[kaveh Purkiani]

Dear Martin,

I tried with all values larger than 0, 1 to 4, none of them could help this
to solve.
I will have a look at documentation again and report you back soon.

Kaveh.

On Mon, Feb 1, 2016 at 10:45 AM, Martin Losch <Martin.Losch at awi.de> wrote:

> I suggest to read the documentation to learn about the parameters
> necessary for the nonlinear free surface:
> <http://mitgcm.org/public/r2_manual/latest/online_documents/node42.html>
> where you will see, that “1” is not the appropriate choice for
> nonlinFreeSurf
>
> Also, did you find a verification example with obcs and nonlinear free
> surface? I suggest verifcation/exp4/input.nlfs
>
> Martin
>
> > On 01 Feb 2016, at 10:35, kaveh Purkiani <kavehpurkiani at googlemail.com>
> wrote:
> >
> > Dear Martin,
> >
> > I use nonlinearFreesurf in my configuration similar to as sinusoidal
> elevation (simple M2) at BC. Also the  nonlinFreeSurf = 1 at data namelist.
> > Should not this work? and show non-zero elevation inside the model as
> well as boundaries?
> >
> > The method for converting the elevation into bartropic velocities seems
> to work, but I wanted to apply a realistic condition to the model (
> components of M2, M4, S2 and O1 ) therefore, using eta BC seems to be more
> accurate.
> >
> > regards
> >
> > Kaveh.
> >
> >
> > On Mon, Feb 1, 2016 at 10:23 AM, Martin Losch <Martin.Losch at awi.de>
> wrote:
> > Kaveh,
> >
> > you probably use a linear free surface in your model configuration? With
> a ***linear*** free surface, the open boundary conditions for Eta have no
> effect (basically, there are none to be specified). But your method of
> converting the elevation into bartropic velocities seems to work, doesn’t
> it?
> >
> > Otherwise you need to use a non-linear free surface, which will make the
> experiment more complicated.
> >
> > Martin
> >
> > > On 30 Jan 2016, at 20:50, kaveh Purkiani <kavehpurkiani at googlemail.com>
> wrote:
> > >
> > > Hi MITgcm users,
> > >
> > > I have been trying to use eta as the only boundary condition in
> > > a configuration.
> > >
> > > below you see the relative part of configuration regarding the bcs at
> data and data.obcs
> > >
> > > data
> > >
> > >  periodicExternalForcing=.TRUE.,
> > >  externForcingPeriod=900.,
> > >  externForcingCycle =43200.,
> > >  &
> > >
> > >
> > > data.obcs
> > >
> > >  OBCSfixTopo=.FALSE.,
> > >  OB_Jnorth= 80*-1,
> > >  OB_Jsouth= 80*1,
> > >  OB_Ieast = 42*-1,
> > >  OB_Iwest = 42*1,
> > >  useOBCSprescribe = .TRUE.,
> > >
> > >  OBNetaFile = 'OBNeta.bin', (Nx,time)
> > >  OBSetaFile = 'OBSeta.bin', (Nx,time)
> > >  OBWetaFile = 'OBWeta.bin', (Ny,time)
> > >  OBEetaFile = 'OBEeta.bin', (Ny,time)
> > >
> > > The boundary conditions are obviously read in (only at boundaries
> output shows identical to what is prescribed as boundary condition),
> > >  but they are not applied inside the domain. Except the boundaries,
> rest of the domain does not show any elevation.
> > >
> > > When I convert the sea surface elevation (eta) into barotropic
> velocity and prescribe the OB(N,S,E,W)(u,v) and no elevation at boundaries,
> it works
> > > properly, with meaningful eta, zonal and meridional values.
> > >
> > > I appreciate any suggestions.
> > >
> > > regards,
> > >
> > > Kaveh.
> > >
> > >
> > >
> > >
> > >
> > >
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> >
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