What does OBCFAC mean??

[kobl1201]

i use open boundary in ROMS model.

i was OBCFAC. it mean that ratio of inflow and outflow nudging time scale.

if i set OBCFAC = 1.0d0, what different effect between OBCFAC = 366.0d0 and OBCFAC = 1.0d0 for running model over 1 year.

my output average is 1 day, and M3NUDG = 1.0d0.

[kate]

If OBCFAC is 1, then both the incoming and outgoing timescales are the same. In general, we want the outgoing timescales to be longer, i.e., stronger nudging on inflow. That's OBCFAC > 1. Having M3NUDG=1 is setting the outgoing timescale to one day, stronger than I would recommend. If you are doing LBC=RadNud, you want the radiation to dominate on outflow.

[wilkin]

Since this is a recurring topic I've updated the entries describing TNUDG and OBCFAC in the entry for ocean.in WikiROMS:

https://www.myroms.org/wiki/index.php/ocean.in