[m.uzair]

Dears,

I am simulating a cold flow model of gas-solid fluidized bed. The problem I am having is with inlet boundary conditions.

At first I applied uniform inlet gas velocity (0.259m/s) at the inlet. It worked perfectly. NOw I want to check the effect of variable inlet gas velocity by using pressure inlet boundary condition. I tried it both ways.. 1) by initializing 2) from the already running case of uniform inlet gas velocity (obtained total pressure of air and applied it at the pressure inlet (Gauge total pressure) ). The moment I do this, there is reverse flow at pressure inlet, the simulations show very abnormal behavior. Basically the solids spread all over the freeboard. and the air velocity at the inlet reaches as high as 8 m/s.

What am I doing wrong?

Can anyone please help.