Learning Forum

[qamar]

Hi Everyone,

I have a 3D airfoil with symmetry on both sides. I am trying to use this UDF for pitching motion, but I don't see any pitching motion. I have used this UDF for 2D cases successfully. Can you please update what to add to this to use it for the 3D case?

Thank you.

include
#include
#include "udf.h"
#include "dynamesh_tools.h"
/******************************************************************/
/*User-defined function for dynamic mesh */
/*****************************************************************/
#define pi 3.1415926535897932384626433832795
#define ff 1.317803
DEFINE_CG_MOTION(move_body, dt, vel,omega, time, dtime)
{ 
real alphabar,ome;
/* reset velocities */
NV_S(vel,=,0.0);
NV_S(omega,=,0.0);
/* motion */
       alphabar=20*pi/180; /* amplitude, pi/180 used for have rad instead of deg */
       ome=alphabar * ff*2*pi*cos(ff*2*pi*time);
  vel[0] = 0.0;
  vel[1] = 0.0;
  vel[2] = 0.0;
  omega[0] = 0.0;
  omega[1] = 0.0;
  omega[2] = ome;
}

Kindly update soon as it is needed for my urgent project. Thank you in advance.

[Federico Alzamora Previtali]

Hello,

how are you assigning this motion in Fluent? Can you share a screenshot of the Dynamic Mesh zones settings?

[qamar]

Thank you Federico,

I am hereby attaching the pics with assigned motion. Please update me accordingly.

[Federico Alzamora Previtali]

Can you tell me what internalfluid and externalfluid zones are? Can you show a screenshot of the domain?

Also, what are the Motion Attributes for the airfoil?