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Porous jump modelling: steady vs transient

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Old   December 13, 2011, 19:04
Default Porous jump modelling: steady vs transient
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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?


Fig-1: Steady simultaion; maxvelocity 2.95m/s.


Fig-2: Transient simulation; max velocity 3.23m/s.
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Old   December 28, 2011, 22:12
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Any ideas, comments, suggestions??
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Old   January 20, 2012, 05:05
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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
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