[daviqperez]

Hello everyone.

Im trying to move a 4 mm particle on a normal flow of a pipe 10 mm inlet and 200 mm lenght with the 6DOF implementation, but every time i start the simulation i get a negative volumen cell and my particle move far away from my mesh.

i want to make something like this videos:


https://www.youtube.com/watch?v=_VLUbhNz6Dk
https://www.youtube.com/watch?v=lVmNGA3w-gs
https://www.youtube.com/watch?v=Jfqpv3jQH_A

my set up:

transient analysis
Laminar flow
material water
velocity-inlet: 0.005 m/s
Pressure-outlet: 0

Dynamic mesh:

smoothing (spring factor 0.5)+ remeshing (default parameters) + 6DOF (gravity 0)

Solution Methods:

p-v : simple
pressure: second order
momentom: second order


This its my UDF

#include "udf.h"


DEFINE_SDOF_PROPERTIES(falling_box, prop, dt, time, dtime)
{
prop[SDOF_MASS] = 7e-4;
prop[SDOF_IZZ] = 1.0993061e-6;
prop[SDOF_IXX] = 1.0993061e-6;
prop[SDOF_IYY] = 1.0993061e-6;

prop[SDOF_ZERO_ROT_Z] = TRUE;
prop[SDOF_ZERO_ROT_X] = TRUE;
prop[SDOF_ZERO_ROT_Y] = TRUE;


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

[daviqperez]

Finnaly i do it, i was setting wrong my mass for my 2D particle. The mass need to be calculate with 1m depth. i will try know to run the 3D case and i will update if i need help or i got it.