Hi everyone
I am simulating a 2D airfoil pitching and plunging motion simulation.
I run the simulation in fluent by compiling the UDF .c file and set the airfoil as the rigid body and it adjacent zone as deforming.
I tick smoothing and remeshing box under the "mesh method"
My problem is when I try to preview the mesh motion in the window1 "grid", I cant see any grid and mesh display on the screen. I also unable to see any image for the saved picture at each time step.
Based on my understanding Fluent be able to capture and save images of the mesh motion at each time step if we tick the "save picture" box.
It was a blank picture has been saved into my working folder.
can anybody help me.
Hi
Pls, check these:
1. you should compiled your UDF not interpreted.
2. set airfoil as rigid (if you use c_g motion command)
3. your solver must be in unsteady situation
There is an example for UDF:
# include "udf.h"
#define h 0.325 /* Amplitude */
#define K 0.16 /* Reduced Frequency */
DEFINE_CG_MOTION(airfoil, dt, vel, omega, time, dtime)
{
omega[1]=sin(2.0*K*time);
vel[1]=-h*2.0*K*sin(2.0*K*time);
}
Best Regards
According to my experience, if your mesh has a great number, you should display you mesh before your preview.
I am trying to do something similar using fluent, i am using this equation alpha(t)=alpha(0)+alpha(1)sin(2*pi*f*t) to a frefined inner region using mesh motion on that zone. However the inlet fresstream is sinusoidal oscillating freastrem so do i need to specify another udf at the inlet? Do you have any advice, thank you
#include #include #include "udf.h"
DEFINE_CG_MOTION(airfoil_pitch, dt, vel, omega, time, dtime){ real pitchampl, pitchdispl, omg, pi, count;
pi = 3.14159265;
/* reset velocities */ NV_S(vel, =, 0.0); NV_S(omega, =, 0.0);
/* motion */ pitchampl = 20 * pi / 180; /* angular pitch amplitude */ omg = 2 * pi * 40; /* angular frequency */ pitchdispl = pitchampl * sin(omg * time); /* resultant displacement */
omega[2] = pitchampl * omg * cos(omg * time);}
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