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- - **Dynamic mesh with DEFINE_CG_MOTION problem**
(*https://www.cfd-online.com/Forums/fluent-udf/103797-dynamic-mesh-define_cg_motion-problem.html*)

Dynamic mesh with DEFINE_CG_MOTION problemHi all user!
I trying to simulate pitching of airfoil using UDF code as below. While I running simulation, I tried to check pitching angle at every time step that can be written in Fluent window. Additional, I accessed pitching angle of airfoil by using GUI like: Define---Dynamic Mesh-->ZonesIn Dynamic mesh zones form, I checked Center of Gravitation Orientation, and I found that there are slightly different pitch angle between this value and output value in Fluent window.Anybody have experience in this case, please tell me. Thanks in advanced #include "udf.h" #include "stdio.h" float pitch_angle,pi,rad; DEFINE_CG_MOTION(trans1, dt, vel, omega, time, dtime) { pi = 3.1415926536; rad=pi/180.0; vel[0] = 0.0 ; vel[1] = 0.0 ; vel[2] = 0.0 ; omega[0] = 0.0 ; omega[1] = 0.0 ; omega[2] = 0.34906585*(pi/2)*cos((pi/2)*time); pitch_angle = 0.34906585*sin((pi/2)*time)*(1/rad); Message0("\n Time = %g\n",time); Message0("\n Omega = %g\n",omega[2]); Message0("\n Pitch = %g\n",pitch_angle); } |

(Emergence) Dynamic mesh with DEFINE_CG_MOTION problemHi,
I have exactly the same problem that calculated AOA does not correspond to orientation of angle in the simulation. how did you solve this problem ?? |

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