problems with residuals in fluent.

Tan

Hi

I am having problems with my residuals in fluent. Tmy velocities and energy lines are both dropping to 1e-06 but my k , epsiolon and most important contuinity are not dropping below 1e-03??

i am modelling a simple closed cavity in a pipe. my inlet for the pipe has - a massflow = 0.305kg/s - turbulence intensity=5% - length scale=61mm (diamater of my pipe) - temp 291k

outlet;

-gauge pressure of 0 -turbulence intensity=0.01 -length scale=61mm

i have messed around with my mesh to make it finer where i have seen high velocity or turbulence values but no matter how fine i make it i cannot get the residuals to drop??

i am using a p-v coupling= coupled with standard default values

canyone help or suggest anything?

thanks in advance

Tan