Toiletbowl modeling

Shazlan

Hi all,

I am modeling a toiletbowl. In setting up the model, I have a few doubts whether or not my approach is correct.

1. Is it necessary to use 'free surface' option to model the water flow in and the remaining water in the bowl? Or using two materials (one is air and the other is water) is sufficient already? in other words, without using the free surface option, will starcd know that water and air in the toiletbowl, ideally, does not mix and react?

2. as for the boundaries, i am using inlet and pressure boundaries. inlet is self explanatory (i think!). the 'static' pressure boundaries are applied at both, the outlet and the open area (where we sit). now, how do i set the pressure at the outlet that initially it is the same as atmosphere but later, it changes?

i ran many runs already and yet the solution always diverges. i played around with the time steps (i believe it is small enough), under-relaxation factor, # of sweep and relative tolerance and yet, no change. so please help. Thanks in advance!!!

shazlan