External Aero Yaw Case: How Are you Yawing?

stark22 · November 29, 2012, 18:54

Hey Everyone,

I would like to run an external aero case (automotive based) at some degree of yaw. My questions are:

How do you yaw the model? In OpenFOAM or in your CAD system? If you yaw the model in CAD how do you yaw the refinements regions?

Thoughts, comments, suggestions would be greatly appreciated!

Ivanet · November 30, 2012, 05:33

Hi stark22,
why do not you change the wind direction instead of changing the orientation of your car?
Greetings
Ivan

stark22 · November 30, 2012, 11:08

Hey Ivan,
Would changing the inlet velocity angle be considered "best practice" for simulation a ground vehicle at yaw? Would this require any updates the the "wall", "ceiling", "exit plane" "floor" boundary conditions?

Thank you.

Ivanet · November 30, 2012, 13:03

Changing the wind direction is fully correct if you adapt the outer boundaries of your domain.
Greets
Ivan

stark22 · November 30, 2012, 16:14

What would the adaptations be to the outer boundaries?

Ivanet · December 1, 2012, 07:59

The air should flow through all your outer boundaries if you want to simulate yawed inflow. Consider using boundary conditions which are appropriate for that.
Cheers
Ivan

November 29, 2012, 18:54	External Aero Yaw Case: How Are you Yawing?	#1
stark22 New Member Join Date: Nov 2009 Posts: 28 Rep Power: 17	Hey Everyone, I would like to run an external aero case (automotive based) at some degree of yaw. My questions are: How do you yaw the model? In OpenFOAM or in your CAD system? If you yaw the model in CAD how do you yaw the refinements regions? Thoughts, comments, suggestions would be greatly appreciated!

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November 30, 2012, 05:33		#2
Ivanet Member Join Date: Oct 2010 Location: Germany Posts: 39 Rep Power: 16	Hi stark22, why do not you change the wind direction instead of changing the orientation of your car? Greetings Ivan

November 30, 2012, 11:08		#3
stark22 New Member Join Date: Nov 2009 Posts: 28 Rep Power: 17	Hey Ivan, Would changing the inlet velocity angle be considered "best practice" for simulation a ground vehicle at yaw? Would this require any updates the the "wall", "ceiling", "exit plane" "floor" boundary conditions? Thank you.

November 30, 2012, 13:03		#4
Ivanet Member Join Date: Oct 2010 Location: Germany Posts: 39 Rep Power: 16	Changing the wind direction is fully correct if you adapt the outer boundaries of your domain. Greets Ivan

November 30, 2012, 16:14		#5
stark22 New Member Join Date: Nov 2009 Posts: 28 Rep Power: 17	What would the adaptations be to the outer boundaries?

December 1, 2012, 07:59		#6
Ivanet Member Join Date: Oct 2010 Location: Germany Posts: 39 Rep Power: 16	The air should flow through all your outer boundaries if you want to simulate yawed inflow. Consider using boundary conditions which are appropriate for that. Cheers Ivan