fluent udf:DEFINE_CG_MOTION 宏1
2017-01-16 by:CAE仿真在線 來(lái)源:互聯(lián)網(wǎng)
fluent udf:DEFINE_CG_MOTION 宏1:
#include "udf.h"
#include "mem.h"
#include "dynamesh_tools.h"
static real v_x = 0.0,v_y=0.0,omega_z=0.0;
DEFINE_CG_MOTION(piston,dt,vel,omega,time,dtime)
{
face_t f;
cell_t c;
real
f_glob[ND_ND],m_glob[ND_ND],x_cg[ND_ND],dv_x,dv_y,domega_z;
Domain *domain= Get_Domain (1);
Thread *tf1 = Lookup_Thread (domain, 3);
int i;
/* reset velocities */
NV_S(vel, =, 0.0);
NV_S(omega, =, 0.0);
if (!Data_Valid_P())
return;
for(i=0;i<=ND_ND;i++)
{
f_glob[i]=0;
m_glob[i]=0;
}
/* get the thread pointer for which this motion is defined */
for(i=0;i<ND_ND;i++)
x_cg[i]=DT_CG(dt)[i];
if(time<=0.001)
{
vel[1]=34.5;
Message ("\ntime=%f ,x=%.10lf ,y=%.10lf , force_x=%.1f
,force_y=%.1f ,moment_x=%f,moment_y=%f,moment_z=%f ,Vx=%f ,Vy=%f
,omega_z=%f\n",
time,x_cg[0],x_cg[1],f_glob[0],f_glob[1],m_glob[0],m_glob[1],m_glob[2],v_x,v_y,omega_z);
return;
}
/* compute pressure force , viscosity force and moment on body
by looping through all faces */
Compute_Force_And_Moment (domain, tf1, x_cg, f_glob, m_glob,
TRUE);
/* compute change in velocity and angle velocity, i.e., dv = F *
dt / mass
velocity update using explicit Euler formula */
dv_x = dtime * f_glob[0] / 39400;
v_x += dv_x;
dv_y = dtime * f_glob[1] / 39400;
v_y += dv_y;
domega_z=dtime*m_glob[2]/390000;
omega_z+=domega_z;
Message ("\ntime=%f ,x=%.10lf ,y=%.10lf , force_x=%.1f
,force_y=%.1f ,moment_x=%f,moment_y=%f,moment_z=%f ,Vx=%f ,Vy=%f
,omega_z=%f\n",
time,x_cg[0],x_cg[1],f_glob[0],f_glob[1],m_glob[0],m_glob[1],m_glob[2],v_x,v_y,omega_z);
/* set components of velocity */
vel[0] = v_x,vel[1]=v_y,omega[2]=omega_z;
}
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