[Daban]

HELLO WORLD
i am doing a simulation on effect of vortex induced vibration on cylinders, i wrote a udf file like this:
#include "udf.h"
DEFINE_SDOF_PROPERTIES(sdof_props, prop, dt, time, dtime)
{
real cgy;
real k = 170;
cgy = DT_CG(dt)[1];
prop[SDOF_MASS] = 170;
prop[SDOF_ZERO_TRANS_Y] = TRUE;
prop[SDOF_IXX] = 122.4;
prop[SDOF_IYY] = 122.4;
prop[SDOF_IZZ] = 40.8;
prop[SDOF_LOAD_F_Y] = -k*cgy;
printf("\n updated 6DOF properties");
}
what i expect is a movement (vibration) in y direction but when i do the analysis my cylinder moves in x direction. can anyone tell me if i wrote the correct udf file !!? von karman effect.PNG