Hi what does inflow for nudging time scale mean??

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kobl1201
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Location: Kongju National Universty

Hi what does inflow for nudging time scale mean??

#1 Unread post by kobl1201 »

Hi

OBCFAC is the radio of inflow and outflow nudging time scale.

Here, I wonder the meaning of inflow and outflow for nudgiinh time scale.

Inflow means data of climatology and outflow means the data calculated in model???

IF i set obcfac =5 to obcfac = 10, what does it mean??

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kate
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Location: CFOS/UAF, USA

Re: Hi what does inflow for nudging time scale mean??

#2 Unread post by kate »

Say TNUDG=200, that means the nudging (if on) will be a timescale of 200 days if the flow is going out. Then an OBCFAC=10 will mean that the inflow nudging timescale will be ten times shorter, or 20 days.

kobl1201
Posts: 60
Joined: Tue Nov 04, 2014 8:29 pm
Location: Kongju National Universty

Re: Hi what does inflow for nudging time scale mean??

#3 Unread post by kobl1201 »

Thanks Kate.

Here, inflow and outflow mean current in the boundary ???

Is it right??

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kate
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Re: Hi what does inflow for nudging time scale mean??

#4 Unread post by kate »

Sort of. The model computes the wave speed (and direction) at each grid point and uses that to determine if things are "inflow" or "outflow". Look at say u3dbc_im.F:

Code: Select all

                dUdt=u(Istr+1,j,k,nstp)-u(Istr+1,j,k,nout)
                dUdx=u(Istr+1,j,k,nout)-u(Istr+2,j,k,nout)
...
                  IF ((dUdt*dUdx).lt.0.0_r8) THEN
                    tau=obc_in
                  ELSE
                    tau=obc_out
                  END IF

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