get instationary response

hugdev · November 17, 2009, 05:14

Hi!
work on a flow around an airbrake, which in reality has transient solutions. The problem is that cfx always send me the same steady response, even when I lauch the transient mode.
How could I do to get a transient solution, how could I insert the instationarity? are there typical initial conditions, typical boundary conditions to get that kind of transient response?
Thanks for your help
hugh

CP85 · November 17, 2009, 05:28

Hi,

some things that come into my mind:

Is the mesh fine enough?
Did you try different turbulence-models?
Is the timestep fine enough when performing an instationary solution?
Are the flow velocity and the fluid parameters compareable to reality?

November 17, 2009, 05:14	get instationary response	#1
hugdev New Member Join Date: Nov 2009 Posts: 1 Rep Power: 0	Hi! work on a flow around an airbrake, which in reality has transient solutions. The problem is that cfx always send me the same steady response, even when I lauch the transient mode. How could I do to get a transient solution, how could I insert the instationarity? are there typical initial conditions, typical boundary conditions to get that kind of transient response? Thanks for your help hugh

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November 17, 2009, 05:28		#2
CP85 New Member Join Date: Sep 2009 Posts: 10 Rep Power: 17	Hi, some things that come into my mind: Is the mesh fine enough? Did you try different turbulence-models? Is the timestep fine enough when performing an instationary solution? Are the flow velocity and the fluid parameters compareable to reality?