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VIV; Relation between CL and stiffness of the cylinder.

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Old   October 5, 2015, 08:22
Default VIV; Relation between CL and stiffness of the cylinder.
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I am doing a VIV investigation on a square cylinder in ANSYS Fluent and Im trying to replicate the results from this article;

But so far without any luck. A recent test showed that the lift coefficient changed with changed stiffness of the cylinder which feels strange?

My UDF looks like follows:

#include "udf.h"

DEFINE_SDOF_PROPERTIES(sdof_props,prop,dt,time,dti me)
real cg;
real k = 118.435;
cg = DT_CG(dt)[1];
prop[SDOF_MASS] = 3;
prop[SDOF_LOAD_F_Y] = -k*cg;

The lift coefficient should be indepedent of the stiffness, k, right?

Thanks in advance
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