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Hull UDF - 3D to 2D

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Old   July 12, 2022, 15:10
Default Hull UDF - 3D to 2D
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Hello,

I am developing the simulation of hull with approaching wave. I have already used overset mesh in my model and the next step is to make the hull to move. To do that, as i understand i need to use the udf file with 6dof parameters.

Due to that, i found the udf in some book for similar 3D model:

Code:
#include "udf.h"
DEFINE_SDOF_PROPERTIES(fourdof, prop, dt, time, dtime)
{
prop[SDOF_MASS] = 500.0; /*mass*/
prop[SDOF_IXX] = 0.0; /*x revolve center*/
prop[SDOF_IYY] = 0.0; /*y revolve center*/
prop[SDOF_IZZ] = 0.0; /*z revolve center*/
prop[SDOF_ZERO_TRANS_X]=TRUE;
prop[SDOF_ZERO_TRANS_Y]=TRUE;
prop[SDOF_ZERO_TRANS_Z]=FALSE;
prop[SDOF_ZERO_ROT_X]=FALSE;
prop[SDOF_ZERO_ROT_Y]=FALSE;
prop[SDOF_ZERO_ROT_Z]=TRUE;
}
But of course i need to rearrange it to 2D case (X-Y). To do that, i should skip parts that refers to third additional axis? I did it in a following way:

Code:
#include "udf.h"
DEFINE_SDOF_PROPERTIES(fourdof, prop, dt, time, dtime)
{
prop[SDOF_MASS] = 500.0; /*mass*/
prop[SDOF_IXX] = 0.0; /*x revolve center*/
prop[SDOF_IYY] = 0.0; /*y revolve center*/
prop[SDOF_ZERO_TRANS_X]=TRUE;
prop[SDOF_ZERO_TRANS_Y]=TRUE;
prop[SDOF_ZERO_ROT_Z]=TRUE;
}
I want boat to move in X,Y axis and also rotate in Z axis but it stands still in the center of the domain, even after the wave passes through it.

Does my UDF is incorrect, or should I focus on other settings of my Fluent Setup? Or maybe in such an easy case should i use the GUI 6dof input? Here i'm sending sample photo of my simulation: https://i.imgur.com/v5rwqLo.png
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6dof, hull, multiphase, overset

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