# simulating wing motion of an insect???

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January 18, 2012, 00:25
simulating wing motion of an insect???
#1
Member

aerosapien
Join Date: Sep 2010
Posts: 59
Rep Power: 6
Hi, I am trying to simulate the motion of a insect wing (uniaxial motion i.e just rotation) in CCM+. I have selected the following physical conditions.

Morpher
3 dimesnsional
constant density
segregated flow
gas
turbulent
K-epsilon model

Can nay one tell me how to specify motion for the wing.

regards
www.aerosapien.blogspot.com
Attached Images
 wing mesh top.jpg (19.9 KB, 55 views) iso wing.jpg (25.4 KB, 55 views)

 February 13, 2012, 03:17 #2 Senior Member   Ping Join Date: Mar 2009 Posts: 223 Rep Power: 8 simple next step - create a field function which specifies the rotation velocity of the wing as a function of radius - eg using a sin function and a local cylindrical coordinate system. then for the wing change morpher setting to grid velocity and apply the field function. we are promised overset mesh is version 7.02 coming soon and this will make this case faster to solve since the morpher adds another set of equations to solve. sanjay likes this.

 February 13, 2012, 04:27 #3 Member     aerosapien Join Date: Sep 2010 Posts: 59 Rep Power: 6 thanks for the reply, Il work on it and get back for more discussion regards www.aerosapien.blogspot.com

 February 16, 2012, 09:41 #4 Member   Ryan Coe Join Date: Jun 2010 Location: Albuquerque, NM Posts: 98 Rep Power: 6 You could also create a field function, as ping suggests, but use the rotation and translation motion module to move the entire domain. This would be less computationally intensive than morphing the mesh. Ryan __________________ Ryan

 February 18, 2012, 08:26 #5 Senior Member   Join Date: Oct 2009 Location: Germany Posts: 637 Rep Power: 12 Ryan, he needs to morph the mesh since not all of the domain will rotate. Just the wing will do the rotation while the body won't. Sanjay, you can also directly apply a motion as boundary condition for the morpher. That's much easier than creating a field function specifying the grid velocity etc. I agree to ping that overset mesh (once it's released, should be at beginning of march) will be a better approach, since morphing sometimes needs much more computing time than the flow solver and needs a significant amount of memory, especially on big meshes.

 February 18, 2012, 10:54 #6 Member   Ryan Coe Join Date: Jun 2010 Location: Albuquerque, NM Posts: 98 Rep Power: 6 Didn't realize there was a body involved. Good catch! __________________ Ryan

March 6, 2012, 02:53
#7
Member

aerosapien
Join Date: Sep 2010
Posts: 59
Rep Power: 6
thanks a lot for those replies.
I decided that I will first do 2D simulation of flapping and then go for 3D

Can any one tell me how to create the flapping in 2D

regards
www.aerosapien.blogspot.com
Attached Images
 aerofoil 2d1.jpg (26.7 KB, 14 views) aerofoil 2d2.jpg (88.3 KB, 18 views)

 May 11, 2012, 07:44 #8 New Member   alireza Join Date: Jul 2009 Posts: 25 Rep Power: 6 Hi Dear users. I write a UDF for flapping wing for fluent and compiled it and dont have any problem. But i can not use dynamic mesh? can you help me. 1- in gambit creat a zone aroud airfoil and implement a interface boundary condition. 2- in fluent i use define-interface 3- enable dynamic mesh with layering and smoothing. 4- selected airfoil and use UDF. But airfoil is fixed and dont move! albeit: fluent have this error: cg motion is incorrect.

 May 11, 2012, 18:40 #9 Senior Member   Join Date: Oct 2009 Location: Germany Posts: 637 Rep Power: 12 alireza_b, this is the star-ccm+ forum. __________________ We do three types of jobs here: GOOD, FAST AND CHEAP You may choose any two! Last edited by abdul099; May 12, 2012 at 08:10.

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