3D F1 Front Wing Domain Size

andyjo22 · April 1, 2012, 08:53

Hi,

I have started working on a 3D analysis of an F1 front wing and was wondering what kind of domain sizing I should be using to take account of the wing tip vortices?

I have come across various indications one saying 3 times the span of the wing, the other saying just one times the span.

Cheers

siw · April 1, 2012, 09:27

Give them both a try and see what consequences (if any) it has on the results that matter to your study. Treat it like you would with a mesh independence assessment.

Generally in external aerodynamics simulations the doman should be far enough away so that it does not effect the region of interest, because in real life there is no far-field boundary so it is an artificial but required feature for the simulation.

Martin Hegedus · April 3, 2012, 22:43

A lot depends on your boundary conditions, however,

the dependency of a 2D airfoil load on the farfield placement is negligible at about 150 times the chord. In general, for a 2D airfoil, 100 is probably OK, but I would not go less than 50. For real work at least. 3D shapes are a little more forgiving, so 50 times largest length scale is OK. Unfortunately everything is very nonlinear, so when you do your convergence test you need to pick a case which is about to "fall off the cliff" so to speak. In other words, the solution is on the verge of being kicked into a totally different solution space.

April 1, 2012, 08:53	3D F1 Front Wing Domain Size	#1
andyjo22 New Member Andy Join Date: Mar 2012 Posts: 6 Rep Power: 14	Hi, I have started working on a 3D analysis of an F1 front wing and was wondering what kind of domain sizing I should be using to take account of the wing tip vortices? I have come across various indications one saying 3 times the span of the wing, the other saying just one times the span. Cheers

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April 1, 2012, 09:27		#2
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 742 Rep Power: 26	Give them both a try and see what consequences (if any) it has on the results that matter to your study. Treat it like you would with a mesh independence assessment. Generally in external aerodynamics simulations the doman should be far enough away so that it does not effect the region of interest, because in real life there is no far-field boundary so it is an artificial but required feature for the simulation.

April 3, 2012, 22:43		#3
Martin Hegedus Senior Member Martin Hegedus Join Date: Feb 2011 Posts: 500 Rep Power: 19	A lot depends on your boundary conditions, however, the dependency of a 2D airfoil load on the farfield placement is negligible at about 150 times the chord. In general, for a 2D airfoil, 100 is probably OK, but I would not go less than 50. For real work at least. 3D shapes are a little more forgiving, so 50 times largest length scale is OK. Unfortunately everything is very nonlinear, so when you do your convergence test you need to pick a case which is about to "fall off the cliff" so to speak. In other words, the solution is on the verge of being kicked into a totally different solution space.