- **Fluent UDF and Scheme Programming**
(*https://www.cfd-online.com/Forums/fluent-udf/*)

- - **UDF code**
(*https://www.cfd-online.com/Forums/fluent-udf/104800-udf-code.html*)

UDF codeI'm simulating a flapping wing aircraft and have designed a rectangular wing to model that. I have to use dynamic motion to model the flapping motion. However, I am not familiar with dynamic mesh. What I know is that I have to use a UDF code to define the motion. I am using the following UDF code which has been posted by a member on the forum to simulate the motion but everytime I compile the code I get an error. has anyone faced this problem before?
#include "udf.h" #include "dynamesh_tools.h" DEFINE_CG_MOTION(asymflap, dt, v_cg, omega, time, dtime) { Thread *t; NV_S(v_cg, =, 0.0); NV_S(omega, =, 0.0); if (!Data_Valid_P()) { Message("Wrong\n"); return; } t=DT_THREAD((Dynamic_Thread*)dt); frequency = 3.0; pi = 3.141592654; /* define motion variables */ Ar = 30.0; /*roll amplitude*/ Ap = 5.0; /*pitch amplitude*/ Ay = 0.0; /*yaw amplitude*/ Aroll = Ar*pi/180.0; /*conversion to radians*/ Apitch = Ap*pi/180.0; /*conversion to radians*/ w=2.0*pi*frequency; /*omega (radians)*/ T=1.0/frequency; roll = Aroll*sin(w*time + pi/2); droll = w*Aroll*cos(w*time + pi/2); pitch = Apitch*sin(w*time); dpitch = w*Apitch*cos(w*time); /*euler angles initial frame mod 1*/ omega[0] = droll; omega[1] = dpitch*1.0*cos(roll); omega[2] = dpitch*1.0*sin(roll); Message("time:%f omegax:%f omegay:%f omegaz:%f \n", time, omega[0], omega[1],omega[2]); |

What kind of error do you get when trying to compile the UDF?
Did you try interpreting it instead? |

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