[Rcfd1]

As the tile suggest I am trying to run an oscilating plate transient simulations.

Basically I repeating all the steps from this video: https://www.youtube.com/watch?v=YTxch2vyphk&t=987s

But instead of Mesh Motion Rotation I am trying to insert the UDF (Cell Zones-> Inner Plate -> Mesh Motion)

But Ansys cannot recognize the UDF in that tab. (It recognizes it in the 6DOF tab though)

Can someone guide me on how should I load my UDF for that specific case and also maybe help me with the code?

My current code is this one.

#include "udf.h"

#define AMP 5.0 // Amplitude of pitch oscillation (degrees)
#define FREQ 1.0 // Frequency of oscillation (Hz)
#define PHASE 0.0 // Phase shift (radians)

DEFINE_CG_MOTION(pitching_airfoil, dt, vel, omega, time, dtime)
{
real angle_of_attack;
real angular_velocity;

// Calculate the oscillating angle of attack (in degrees)
angle_of_attack = AMP * sin(2 * M_PI * FREQ * time + PHASE); // Sinusoidal oscillation from -AMP to +AMP

// Convert the angle of attack to radians (since Fluent uses radians for rotation)
angle_of_attack = angle_of_attack * M_PI / 180.0; // Convert degrees to radians

// Calculate the angular velocity (time derivative of angle of attack)
angular_velocity = 2 * M_PI * FREQ * AMP * cos(2 * M_PI * FREQ * time + PHASE); // Derivative of sin for velocity

// Apply the angular velocity to the airfoil's rotation (about the z-axis, for pitch)
omega[0] = 0.0; // No rotation about x-axis
omega[1] = 0.0; // No rotation about y-axis
omega[2] = angular_velocity; // Rotation about the z-axis for pitching

// Translational velocity components (no translation in this case)
vel[0] = 0.0; // No velocity in the x-direction
vel[1] = 0.0; // No velocity in the y-direction
vel[2] = 0.0; // No velocity in the z-direction
}

This code is with the help of ChatGPT.