Why does the upper shockwave move aft with trailing edge deflection?

Transonic · March 29, 2023, 09:26

Hi, I’ve noticed that when I increase the trailing edge deflection of my 0012, the shock moves further towards the trailing edge, but why?

Also, how does the lower shock just disappear?

Flow is Transonic

NickFL · March 29, 2023, 15:50

Just one thought here, Kuta Condition which states that the pressure has to be consistent at the trailing edge.

Transonic · March 29, 2023, 17:08

Hi Nick, thanks, I’ll look into the Kutta condition

LuckyTran · March 29, 2023, 19:16

It looks like you have slip walls on the upper and lower boundaries and when you change the tail geometry, more flow goes through the upper surface of the airfoil and less through the lower.

Transonic · March 30, 2023, 04:58

Hi LuckyTran, about the slip condition, I put no slip as the boundary condition?

March 29, 2023, 15:50		#2
NickFL Senior Member Join Date: Jun 2009 Location: Technische Universität Chemnitz Posts: 107 Rep Power: 16	Just one thought here, Kuta Condition which states that the pressure has to be consistent at the trailing edge. Transonic likes this.

March 29, 2023, 19:16		#4
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,676 Rep Power: 66	It looks like you have slip walls on the upper and lower boundaries and when you change the tail geometry, more flow goes through the upper surface of the airfoil and less through the lower. Transonic likes this.

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March 29, 2023, 17:08		#3
Transonic Member Join Date: Jan 2023 Posts: 32 Rep Power: 3	Hi Nick, thanks, I’ll look into the Kutta condition

March 30, 2023, 04:58		#5
Transonic Member Join Date: Jan 2023 Posts: 32 Rep Power: 3	Hi LuckyTran, about the slip condition, I put no slip as the boundary condition?