[Rowing]

Hi all! Thanks for everyone's help so far!

I want to implement a velocity set function in a udf over a period. Thus having a velocity over the first half and no velocity over the second.

This will simulate the velocity inlet during rowing

Here is my udf:

#include "udf.h"
#include "dynamesh_tools.h"

DEFINE_CG_MOTION(trans, dt, vel, omega, t, dtime)
{

float t;
face_t f;
float T;

T = 1.79; /*period of full cycle*/

/*reset velocities*/
NV_S(vel, =, 0.0);
NV_S(omega, =, 0.0);

if (!Data_Valid_P ())

{
Message0("\n\nNo data->No mesh motion\n\n");
return;
}

while (t < 1000) /*will run until end specified in FLUENT*/
{
t = 0; /*set current time to zero*/

for (t < (T/2)) /*first half of period*/
{
vel[0] = 3;
}

for (t >= (T/2) && t < T ) /*second half of period*/
{
vel[0] = 0;
}

}
}

Any tips?

I am also struggling with negative cell volumes? Can anyone point me where I should look?

Thank you in advance