Hi what does inflow for nudging time scale mean??

[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??

[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]

Thanks Kate.

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

Is it right??

[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