[suga]

Hallo.
Could you advise on issues that I'm working on now?

I'm going the simulation to be ejected into the atmosphere in a helium gas as a two-dimensional jet.

Computational domain is a rectangular solid of x * y * z = 30 * 40 * 12.
Inflow boundary conditions
In the center of the yz bottom has been set to the velocity-inlet to create a rectangular area.
Further, rectangular side periodic (Figure ①) boundary short side, sides and rectangular upper surface of the long side is set to Pressure-outlet (Figure ②).

To see the shear layer, give How can the Top-Hat velocity distribution of the inflow section as UDF, for 3D calculations, will give the velocity distribution on the short side, we do not get the appropriate result.
Please give me a good advice to solve this problem.

Thank you.

↓UDF source from here

/************************************************** *********************
vprofile.c
UDF for specifying steady-state velocity profile boundary condition
************************************************** **********************/
#include "udf.h"

DEFINE_PROFILE(inlet_x_velocity, thread, position)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
face_t f;

begin_f_loop(f, thread)
{
F_CENTROID(x,f,thread);
y = x[0];
y = fabs(y);
F_PROFILE(f, thread, position) = ((6.05/2.)*(1. - tanh((1./4.)*18.89*(y/0.0017-0.0017/y))));
}
end_f_loop(f, thread)
}