Learning Forum

[vikram chahal]

i want to apply a moment around z axis of a partially filled tank at its base or CG, after compiling while i am hooking this UDF under dynamic mesh, In base as rigid body  its showing incorrect CG motion(Assume No motion)

#include "udf.h"

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

{

    real t = CURRENT_TIME; // Obtain the current simulation time

   

    prop[SDOF_LOAD_M_Z] = 0.0; // Initialize moment load to 0.0

    if (t <= 2.0)

    {

     

        prop[SDOF_LOAD_M_Z] = 5000.0; // Moment load in the z-direction

    }

    printf("\ntank_moment: updated SDOF properties");

}

[SRP]

Hi,

Since you are not seeing the intended motion, it may be beneficial to add additional debugging output to your UDF to track the CG's motion over time.