My model's Kuroshio is gone

[tao]

After three months of operation, my model had this problem. As shown in the picture, it lacked the Kuroshio flow from Taiwan Island to the Philippines, which caused a large amount of warm current to flow into the southern waters of Indo-China Peninsula. I want to know how to solve this problem
Thanks for any suggestion

[tao]

Many days passed, but I still couldn't solve the problem, and Kuroshio still didn't show up in my model.
I tried to modify the relevant parameters of obcfac and TNUDG, changing obcfac to 10 and the latter to 3 days, but the result was even worse, there was a strong southward flow field on the northern border, I did not understand why.
I put my cpp file and my.in file here. I really wish someone had a suggestion

[jcwarner]

just a quick look at your setup i see:
VISC2 == 55.0d0 - that is a bit high. how about just = 1.0 or something like that.
did your initial conditions include the current?

[tao]

Dear jcwarner, thank you very much for your advice. I will go back and try to modify the relevant parameters.
My initial file contains current, all from hycom

[tao]

I checked the previous experiment and found that after I changed the value of obcfac to 0, my model had an unexplained vortex in eastern Taiwan. In fact, in most of my other experiments, similar vortexes were present, with a strong current moving south along eastern Taiwan, while the northbound current from the Philippines had to shift east
This is the image at obcfac=0, with the roms model, HYCOM data and satellite data from Oscar from left to right

[jcwarner]

OBCFAC Factor between passive (outflow) and active (inflow) open
! boundary conditions. The nudging time scales for the
! active (inflow) conditions are obtained by multiplying
! the passive values by OBCFAC. If OBCFAC > 1, nudging on
! inflow is stronger than on outflow (recommended).
!

so if you set obc fac =0, the inflow will be 0.
try obcfac = 1 or greater, see if that helps.

[susonic]

Hello,

My recommendation

1.
Run with
Clmap condition for velocity and tracer

2.
Run with
TNU2 == 5.0d0 5.0d0

TNUDG == 360.0d0 ! days
ZNUDG == 0.0d0 ! days
M2NUDG == 0.0d0 ! days
M3NUDG == 360.0d0 ! days
OBCFAC == 360.0d0 ! nondimensional

I think it will be easier for others to find issue if you upload log file.

-JH

[tao]

Dear jcwarner, thank you very much for your helpful explanation. However, this vortex is still bothering me, as it still exists when I set the OBCFAC to 10 or 100, albeit not as noticeably.

Thank you for your suggestion, JH. I will follow your advice and run the model. I sincerely appreciate the warm help from all of you in the forum.