Unsteady condition for oscillating wing

L1011 · March 16, 2011, 12:13

Dear all,

I would like to simulate to flow around a 2D airfoil that oscillates at high angle of attack using pisoFoam. To do so, the first idea that came out of my mind was to keep the airfoil at is

angle of attack and impose an unsteady condition on the upstream flow such as: $U=U_{inf}[cos(alpha(t),sin(alpha(t),0]$ , where the function alpha(t) is defined by the user.

Someone has any clues on how I should make this work?

Thanks in advance,

L1011

olivierG · March 17, 2011, 08:55

Hello,

Look at GroovyBC ...

Olivier
P.S: what 's your final settings for airfoil simulation now ?

vinair39 · March 17, 2011, 15:14

Hi All,
I also wanted to do simulation around 2d oscillating airfoil. I tried pimpleDymFoam with dynamic meshing. I used sixDoFRigidBody BC. I am getting the movement of airfoil but not what I wanted. I didnt try groovy BC. Will this groovy BC be useful..
Please someone suggest me ...I dont know whether I am going in the right direction.

flowris · March 18, 2011, 07:23

Hello,

I also work on flapping foils, and at first I also thought to simply apply variable boundary velocities instead of moving the foil. Frank Bos, however, told me that this would give a very "stiff" system of equations, which is hard to solve.

Vinny, if you pass me your case with pimpleDyMFoam, I will take a look at it. You can mail it to snedige@yahoo.com.

vinair39 · March 23, 2011, 14:59

Hi Flowris,
Thank you for the reply. I have sent you the pointDisplacement file through mail. I suppose this would help. Also it would be helpful if anyone tell me about groovy BC..

L1011 · April 15, 2011, 15:34

Sorry for my late response, I've been in a rush for the past weeks.

@olivierG: I'll post my case in the coming days

Up to now I've been investigating two promising solution:

adapting the rigid grid motion to pisoFoam
use mesh deformation as shown in the wing motion tutorial of pimpleDyFoam

FYI, you can find on the following address a FSI package that provides a oscillating wing sample. Even-tough it's does not work directly with the last release of OF, it provides good insight.

Thanks for sharing your ideas/progress!

L1011

milad092 · September 19, 2018, 08:25

Quote:

Originally Posted by L1011

Sorry for my late response, I've been in a rush for the past weeks.

@olivierG: I'll post my case in the coming days

Up to now I've been investigating two promising solution:

adapting the rigid grid motion to pisoFoam
use mesh deformation as shown in the wing motion tutorial of pimpleDyFoam

FYI, you can find on the following address a FSI package that provides a oscillating wing sample. Even-tough it's does not work directly with the last release of OF, it provides good insight.

Thanks for sharing your ideas/progress!

L1011

Hi

This is my problem too. I can not import my mesh in OF because of problems. What is the main boundary condition for pitching airfoil?

March 16, 2011, 12:13	Unsteady condition for oscillating wing	#1
L1011 New Member Join Date: Feb 2011 Posts: 20 Rep Power: 15	Dear all, I would like to simulate to flow around a 2D airfoil that oscillates at high angle of attack using pisoFoam. To do so, the first idea that came out of my mind was to keep the airfoil at is angle of attack and impose an unsteady condition on the upstream flow such as: $U=U_{inf}[cos(alpha(t),sin(alpha(t),0]$ , where the function alpha(t) is defined by the user. Someone has any clues on how I should make this work? Thanks in advance, L1011

April 15, 2011, 15:34		#6
L1011 New Member Join Date: Feb 2011 Posts: 20 Rep Power: 15	Sorry for my late response, I've been in a rush for the past weeks. @olivierG: I'll post my case in the coming days Up to now I've been investigating two promising solution: adapting the rigid grid motion to pisoFoam use mesh deformation as shown in the wing motion tutorial of pimpleDyFoam FYI, you can find on the following address a FSI package that provides a oscillating wing sample. Even-tough it's does not work directly with the last release of OF, it provides good insight. Thanks for sharing your ideas/progress! L1011

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March 17, 2011, 08:55		#2
olivierG Senior Member Olivier Join Date: Jun 2009 Location: France, grenoble Posts: 272 Rep Power: 17	Hello, Look at GroovyBC ... Olivier P.S: what 's your final settings for airfoil simulation now ?

March 17, 2011, 15:14		#3
vinair39 New Member vinny Join Date: Feb 2011 Posts: 4 Rep Power: 15	Hi All, I also wanted to do simulation around 2d oscillating airfoil. I tried pimpleDymFoam with dynamic meshing. I used sixDoFRigidBody BC. I am getting the movement of airfoil but not what I wanted. I didnt try groovy BC. Will this groovy BC be useful.. Please someone suggest me ...I dont know whether I am going in the right direction.

March 18, 2011, 07:23		#4
flowris Senior Member Join Date: Apr 2010 Posts: 151 Rep Power: 16	Hello, I also work on flapping foils, and at first I also thought to simply apply variable boundary velocities instead of moving the foil. Frank Bos, however, told me that this would give a very "stiff" system of equations, which is hard to solve. Vinny, if you pass me your case with pimpleDyMFoam, I will take a look at it. You can mail it to snedige@yahoo.com.

March 23, 2011, 14:59		#5
vinair39 New Member vinny Join Date: Feb 2011 Posts: 4 Rep Power: 15	Hi Flowris, Thank you for the reply. I have sent you the pointDisplacement file through mail. I suppose this would help. Also it would be helpful if anyone tell me about groovy BC..