I'm simulating droplet impact onto a moving particle (axisymmetric VOF+6DOF in dynamic mesh). I tried to increase the particle mass in UDF by a factor of 1000 (for the same particle size). But, as you can see in the attached picture, apparently Fluent doesn't realize this huge change in mass.

I guess the reason my results are quite different compared to what I get in experiments is that Fluent doesn't have a sense of the particle mass (and so kinetic energy). How should I define the mass for Fluent?

Here is UDF that I currently use (in SI units):

#include "udf.h"

DEFINE_SDOF_PROPERTIES(test_box, prop, dt, time, dtime)

{

prop[SDOF_MASS] = 4.4e-6;

prop[SDOF_IXX] = 1.76e-12;

prop[SDOF_IYY] = 1.76e-12;

prop[SDOF_IZZ] = 1.76e-12;

prop[SDOF_ZERO_TRANS_X] = FALSE;

prop[SDOF_ZERO_TRANS_Y] = TRUE;

prop[SDOF_ZERO_TRANS_Z] = TRUE;

prop[SDOF_ZERO_ROT_X] = TRUE;

prop[SDOF_ZERO_ROT_Y] = TRUE;

prop[SDOF_ZERO_ROT_Z] = TRUE;

printf ("\n2d_test_box: Updated 6DOF properties");

}

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