Porous jump modelling: steady vs transient
 

Hi,

I'm modelling a porous disk inside a tank. I run a steady and a transient simulation. Results are very different. The only difference between both simulations is in the solution method for Pressure coupling:

• Steady = SIMPLEC
• Transient = PISO

Does anyone know the reason of thess differences?

http://img40.imageshack.us/img40/9207/steady295ms.jpg
Fig-1: Steady simultaion; maxvelocity 2.95m/s.

http://img836.imageshack.us/img836/6...sient323ms.jpg
Fig-2: Transient simulation; max velocity 3.23m/s.

Any ideas, comments, suggestions??

r u using a porous jump or a porous media? what's the reason for running both steady and transient, is there unsteadiness in your flow?

Regards
Luke