[Mar777]

Dear all,
Can anyone tell me what is the problem next message to appear:

"6DOF object must have positive mass"

After compilation, dynamic mesh options set-up I used next option in Fluent: "Mesh motion/Preview" and the program returned the message above.

Here it is the udf:

#include "udf.h"
DEFINE_SDOF_PROPERTIES(airvehicle, prop, dt, time, dtime)
{
prop[SDOF_MASS] = 90.185;
prop[SDOF_IXX] = 27.116;
prop[SDOF_IYY] = 395.094;
prop[SDOF_IZZ] = 395.094;

}

Thank you very much for your help