[Hanvo]

Hello everyone
I am facing issue in my case using ANSYS Fluent ,pitch is not changing ,there are four blades aero foils at 0, 90 , 180 , 270, and want to change pitch at 90 and 270 degree but its not working. I can share my UDF code , case picture for better understanding , any suggestions for correction ?


/**********************************************/
/* blade_pitch.c */
/* UDF for specifying time-varying blade pitch */
/* Simulates +/- 35 deg pitch with a cycle of */
/* 20 ms for four blades. */
/**********************************************/
#include "udf.h"
#define PI 3.141592654
#define MAX_PITCH 35.0 // Maximum pitch in degrees
#define PERIOD 0.02 // Time for one full rotation (seconds)

// Function for Blade 1 (No Phase Shift)
DEFINE_TRANSIENT_PROFILE(blade_pitch_blade1, time)
{
real ampl = MAX_PITCH * (PI / 180.0); // Convert MAX_PITCH to radians
real freq = 2.0 * PI / PERIOD; // Frequency of oscillation
real omega;

omega = ampl * sin(freq * time); // Pitch variation
return omega; // Return pitch in radians
}

// Function for Blade 2 (90° Phase Shift)
DEFINE_TRANSIENT_PROFILE(blade_pitch_blade2, time)
{
real ampl = MAX_PITCH * (PI / 180.0);
real freq = 2.0 * PI / PERIOD;
real omega;

omega = ampl * sin(freq * time + (PI / 2)); // 90° phase shift
return omega;
}

// Function for Blade 3 (180° Phase Shift)
DEFINE_TRANSIENT_PROFILE(blade_pitch_blade3, time)
{
real ampl = MAX_PITCH * (PI / 180.0);
real freq = 2.0 * PI / PERIOD;
real omega;

omega = ampl * sin(freq * time + PI); // 180° phase shift
return omega;
}

// Function for Blade 4 (270° Phase Shift)
DEFINE_TRANSIENT_PROFILE(blade_pitch_blade4, time)
{
real ampl = MAX_PITCH * (PI / 180.0);
real freq = 2.0 * PI / PERIOD;
real omega;

omega = ampl * sin(freq * time + (3 * PI / 2)); // 270° phase shift
return omega;
}