How does cfd package like fluent calculate parasite drag and induced drag?

bellalau · July 28, 2023, 10:08

Hello everyone,

I am a newcomer to CFD and have encountered some questions regarding the calculation of induced drag and parasitic drag while using Fluent for simulations. I am wondering if Fluent allows direct output of induced drag and parasitic drag, but it seems that this feature is not available.

I have learned that Fluent can export the lift coefficient CL and the drag coefficient CD. I am curious if we can calculate the induced drag coefficient CDi using the equation : CDi = CL² / (π * e * AR)(Where CL is the lift coefficient, e is the span efficiency factor and AR is the wing aspect ratio), and then use the equation : CD = CD0 + CDi to obtain the parasitic drag coefficient CD0?

I'm really looking forward to hearing from experienced members!

Thank you all!

LuckyTran · July 28, 2023, 20:48

No need for complicated empirical formula.

Fluent does output induced and parasitic drag. Induced drag is nothing but the projection of the lift force.

bellalau · August 2, 2023, 08:54

How can I achieve that?

July 28, 2023, 10:08	How does cfd package like fluent calculate parasite drag and induced drag?	#1
bellalau New Member bella lau Join Date: Jul 2023 Posts: 2 Rep Power: 0	Hello everyone, I am a newcomer to CFD and have encountered some questions regarding the calculation of induced drag and parasitic drag while using Fluent for simulations. I am wondering if Fluent allows direct output of induced drag and parasitic drag, but it seems that this feature is not available. I have learned that Fluent can export the lift coefficient CL and the drag coefficient CD. I am curious if we can calculate the induced drag coefficient CDi using the equation : CDi = CL² / (π * e * AR)(Where CL is the lift coefficient, e is the span efficiency factor and AR is the wing aspect ratio), and then use the equation : CD = CD0 + CDi to obtain the parasitic drag coefficient CD0? I'm really looking forward to hearing from experienced members! Thank you all!

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July 28, 2023, 20:48		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,763 Rep Power: 66	No need for complicated empirical formula. Fluent does output induced and parasitic drag. Induced drag is nothing but the projection of the lift force.

August 2, 2023, 08:54		#3
bellalau New Member bella lau Join Date: Jul 2023 Posts: 2 Rep Power: 0	How can I achieve that?