[asistas]

Hi!
I'm trying to model a simple gravity current flow Using FLUENT 12.0. It's a very simple one because I'll verify the model results by comparing them with experimental ones. Experimental flume is 4.25 m in length and 0.5 m in depth. first 0.25x0.25 is initially filled with water and at t=0 the lock is opened and gravity flow is recorded. To model this problem I've used. VOF implicit with enabled open channel flow and implicit body force options. For viscous model I've used k-epsilon Realizable with enhanced wall treatment (pressure gradient effects enabled).
The problem with the model is water propagates too slow. Could you let me a hand? Do you have an idea what i have done wrong?

Thank you so much for your time!