Can I analyze morphing airfoil without dynamic mesh?

Yun_YJ · March 28, 2019, 09:40

I want to analyze morphing airfoil in supersonic flow, but I cannot use dynamic mesh since there are some problems. I’m considering to make several sections of airfoil in morphing process. My question is that, is it possible to represent real morphing process?

LuckyTran · March 28, 2019, 11:01

If you don't do the dynamic mesh you can still do the uncoupled (or one-way) fluid-structure interaction problem. You take the aero loads from your aero simulation and import that into a structural solver.

It's uncoupled because you can get how the body deforms under the load but not how the changed body also affects the flow (two-way).

Yun_YJ · March 28, 2019, 12:08

Thanks for answer.

Shape of airfoil is not affected by aerodynamic load; it is changing its shape in mechanical way.
I hope to know if I can select several moments of its mechanical process then analyze each of them with normal (not dynamic) mesh to know the effect of mechanical process on aerodynamics of airfoil.

agd · March 29, 2019, 12:48

If the grid would be deforming during the morphing and you are interested in the transient motion, then you will lose the contribution of the grid motion to the flow solution. The grid velocity terms do contribute to the flow solution unless you are considering several static points where the steady flow solution is being computed.

LuckyTran · March 29, 2019, 14:33

You can treat the solutions you get as the quasi-steady response of the flow (i.e. a very slowly morphing airfoil). This flow is not exactly the same as with the properly morphing airfoil (or a quickly morphing airfoil), but you can probably learn some things from the solution still. It will depend on the flow inertia how significant is this morphing rate.

March 28, 2019, 09:40	Can I analyze morphing airfoil without dynamic mesh?	#1
Yun_YJ New Member Yun Yeong Jun Join Date: Mar 2019 Posts: 2 Rep Power: 0	I want to analyze morphing airfoil in supersonic flow, but I cannot use dynamic mesh since there are some problems. I’m considering to make several sections of airfoil in morphing process. My question is that, is it possible to represent real morphing process?

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March 28, 2019, 11:01		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,750 Rep Power: 66	If you don't do the dynamic mesh you can still do the uncoupled (or one-way) fluid-structure interaction problem. You take the aero loads from your aero simulation and import that into a structural solver. It's uncoupled because you can get how the body deforms under the load but not how the changed body also affects the flow (two-way).

March 28, 2019, 12:08		#3
Yun_YJ New Member Yun Yeong Jun Join Date: Mar 2019 Posts: 2 Rep Power: 0	Thanks for answer. Shape of airfoil is not affected by aerodynamic load; it is changing its shape in mechanical way. I hope to know if I can select several moments of its mechanical process then analyze each of them with normal (not dynamic) mesh to know the effect of mechanical process on aerodynamics of airfoil.

March 29, 2019, 12:48		#4
agd Senior Member Join Date: Jul 2009 Posts: 357 Rep Power: 19	If the grid would be deforming during the morphing and you are interested in the transient motion, then you will lose the contribution of the grid motion to the flow solution. The grid velocity terms do contribute to the flow solution unless you are considering several static points where the steady flow solution is being computed.

March 29, 2019, 14:33		#5
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,750 Rep Power: 66	You can treat the solutions you get as the quasi-steady response of the flow (i.e. a very slowly morphing airfoil). This flow is not exactly the same as with the properly morphing airfoil (or a quickly morphing airfoil), but you can probably learn some things from the solution still. It will depend on the flow inertia how significant is this morphing rate.