For flow situations in which a small, high speed jet of fluid is blowing into a relatively large region filled with fluid, it has been found to be helpful to change the Turb/Lam Ratio to 1000 or greater (the default is 100). This control is accessed with the Turbulence button on the Solve dialog task. An alternative approach is to change the turbulence model to the Low Reynolds Number model and the Advection scheme to ADV 2 (from the Advection button on the Solution Control dialog). This will resolve both the high and low levels of turbulence throughout the domain.