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flapping wings/fishlike propulsion

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Old   April 26, 2006, 05:12
Default flapping wings/fishlike propulsion
  #1
joegi
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Hi,

Currently I'm using an academic software to simulate flappings wings. At this point I would like to compare my results with the results obtained with another software, for instance fluent. I'm wondering if it's possible to do this kind of simulation on fluent.

In a few words, what I need to do is to move my geometry up and down and make it rotate around its spanwise axis, just to simulate the kinematics of a wing. Is this possible in fluent?

I really appreciate your comments and suggestions,

Cheers,

joel
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Old   April 26, 2006, 05:31
Default Re: flapping wings/fishlike propulsion
  #2
Luca
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Yes you can by using the dynamic mesh in Fluent. I deal with fluttering wings but I do not the order of magnitude of your displacements. I'm interested in how you deal with flapping wings with your own code. If you want to contact me my mail is: lucav79@alice.it Luca
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Old   April 28, 2006, 04:11
Default Re: flapping wings/fishlike propulsion
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kelvin
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this is what I am doing now. my thesis is to simulate the bionic propulsion with FLUENT.
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Old   April 28, 2006, 09:02
Default Re: flapping wings/fishlike propulsion
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joegi
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Can you share with us some information?

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Old   May 1, 2006, 12:37
Default Re: flapping wings/fishlike propulsion
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Astozzia
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hey there,

I'd be very interested in getting informed about teh way you tackle this problem.

I a simulating the kinematics of a flapping wing also, using Fluent. I am resorting to a compiled UDF and dynamic meshing.

However, whenever I lauch the simulation, there sems to be negative volumes at the first time step...

Does anyone have a clue? Or did anyone encountered the same error? by the way, my mesh is fine before any iteration.

Thx a billion! Astozzia
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Old   May 12, 2006, 04:12
Default Re: flapping wings/fishlike propulsion
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desantis
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the reason for the negative volumes is that ur time step size is too large. reduce ur time step size. by the way, my msn: [de_santis1981@hotmail.com] i really appreciate anyone who interested in the bionic propulsion to communicate with me.
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Old   May 19, 2006, 02:23
Default Re: flapping wings/fishlike propulsion
  #7
V. Malolan
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Hello !

I am trying to use Fluent for flapping wing studies. I wish to know if RNG K-e model with enhanced wall treatment functions will be OK. If any other simpler model will suit it may be better (because unsteadiness eats away all the time and computer resiurces)
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Old   May 19, 2006, 02:29
Default Re: flapping wings/fishlike propulsion
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desantis
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In my calculations, i found K-w model is much better.
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