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January 10, 2016 03:13 |
Environmental Monitoring. CFD-technology. UDF-function
Kuptsov A.I. "Environmental Monitoring. CFD-technology. UDF-function ". - The scientific journal "Vestnik teknologicheskogo universiteta", №20 - 2015, p. 203-207;
UDF unstable atmospheric stratification
Quote:
#include "udf.h"
#include "mem.h"
#include "flow.h"
DEFINE_PROFILE(inlet_velocity, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real ud=0.0497;
real kk=0.41;
real zz=0.002;
real lmo=-108.1;
face_t f;
real fm;
real f1;
real fe;
real AA;
real BB;
real CC;
real DD;
begin_f_loop(f, thread) /* loops over all faces in the thread passed
in the DEFINE macro argument */
{
F_CENTROID(x,f,thread);
y = x[1];
f1 = 1-(16*y/lmo);
fm = pow(f1, -0.25);
AA = 8*pow(fm, 4);
BB = pow((fm+1), 2);
CC = pow(fm, 2)+1;
DD = -(3.14/2)+2*atan(1/fm);
F_PROFILE(f, thread, index) = (ud/kk) * ( log(y/zz) + log(AA / (BB *CC))+DD );
}
end_f_loop(f, thread)
}
DEFINE_PROFILE(temperature, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real tz=303.15;
real mt=-0.1779;
real kk=0.41;
real zz=0.002;
real lmo=-108.1;
face_t f;
real fm;
real f1;
begin_f_loop(f, thread) /* loops over all faces in the thread passed
in the DEFINE macro argument */
{
F_CENTROID(x,f,thread);
y = x[1];
f1 = 1-(16*y/lmo);
fm = pow(f1, -1/4);
F_PROFILE(f, thread, index) = tz+((mt/kk)*(log(y/zz)-(log(1+(1/(fm*fm))))))-(0.01*(y-zz))+(-0.009775*y);
}
end_f_loop(f, thread)
}
DEFINE_PROFILE(k_profile,t,i)
{
real y, del, h, ufree, x[ND_ND];
real ff, utau, knw, kinf;
real ud=0.0497;
real lmo=-108.1;
face_t f;
real fm;
real f1;
real fe;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
y=x[1];
f1 = 1-(16*y/lmo);
fm = pow(f1, -1/4);
fe = 1-(y/lmo);
F_PROFILE(f,t,i)=5.48*ud*ud*sqrt((fe)/(fm));
}
end_f_loop(f,t)
}
DEFINE_PROFILE(dissip_profile,t,i)
{
real y, x[ND_ND], del, h, ufree;
real ff, utau, knw, kinf;
real mix, kay;
real ud=0.0497;
real lmo=-108.1;
real kk=0.41;
face_t f;
real fm;
real f1;
real fe;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
y=x[1];
f1 = 1-(16*y/lmo);
fm = pow(f1, -1/4);
fe = 1-(y/lmo);
F_PROFILE(f,t,i)= ud*ud*ud*(fe)/(kk*y) ;
}
end_f_loop(f,t)
}
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UDF neutral atmospheric stratification
Quote:
#include "udf.h"
#include "mem.h"
#include "flow.h"
DEFINE_PROFILE(inlet_velocity, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real ud=0.0481;
real kk=0.41;
real zz=0.002;
face_t f;
begin_f_loop(f, thread) /* loops over all faces in the thread passed
in the DEFINE macro argument */
{
F_CENTROID(x,f,thread);
y = x[1];
F_PROFILE(f, thread, index) = ud*(log(y/zz))/kk;
}
end_f_loop(f, thread)
}
DEFINE_PROFILE(temperature, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real tz=303.15;
face_t f;
begin_f_loop(f, thread) /* loops over all faces in the thread passed
in the DEFINE macro argument */
{
F_CENTROID(x,f,thread);
y = x[1];
F_PROFILE(f, thread, index) = tz+(-0.009775*y);
}
end_f_loop(f, thread)
}
DEFINE_PROFILE(k_profile,t,i)
{
real y, del, h, ufree, x[ND_ND];
real ff, utau, knw, kinf;
real ud=0.0481;
face_t f;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
y=x[1];
F_PROFILE(f,t,i)=5.48*ud*ud;
}
end_f_loop(f,t)
}
DEFINE_PROFILE(dissip_profile,t,i)
{
real y, x[ND_ND], del, h, ufree;
real ff, utau, knw, kinf;
real mix, kay;
real ud=0.0481;
real kk=0.41;
face_t f;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
y=x[1];
F_PROFILE(f,t,i)= ud*ud*ud/(kk*y) ;
}
end_f_loop(f,t)
}
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UDF stable atmospheric stratification
Quote:
#include "udf.h"
#include "mem.h"
#include "flow.h"
DEFINE_PROFILE(inlet_velocity, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real ud=0.0472;
real kk=0.41;
real zz=0.002;
real lmo=309.5;
face_t f;
begin_f_loop(f, thread) /* loops over all faces in the thread passed
in the DEFINE macro argument */
{
F_CENTROID(x,f,thread);
y = x[1];
F_PROFILE(f, thread, index) = ud*(log(y/zz)+(5*y/lmo))/kk;
}
end_f_loop(f, thread)
}
DEFINE_PROFILE(temperature, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real tz=303.15;
real mt=0.0507;
real kk=0.41;
real zz=0.002;
real lmo=109.5;
face_t f;
begin_f_loop(f, thread)
{
F_CENTROID(x,f,thread);
y = x[1];
F_PROFILE(f, thread, index) = tz+((mt/kk)*(log(y/zz)+(5*y/lmo)));
}
end_f_loop(f, thread)
}
DEFINE_PROFILE(k_profile,t,i)
{
real y, del, h, ufree, x[ND_ND];
real ud=0.0472;
real lmo=309.5;
face_t f;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
y=x[1];
F_PROFILE(f,t,i)=5.48*ud*ud*sqrt((lmo+(4*y))/(lmo+(5*y)));
}
end_f_loop(f,t)
}
DEFINE_PROFILE(dissip_profile,t,i)
{
real y, x[ND_ND], del, h, ufree;
real ud=0.0472;
real lmo=309.5;
real kk=0.41;
face_t f;
begin_f_loop(f,t)
{
F_CENTROID(x,f,t);
y=x[1];
F_PROFILE(f,t,i)= ud*ud*ud*(1+((4*y)/lmo))/(kk*y) ;
}
end_f_loop(f,t)
}
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and UDF source term
Kuptsov A.I., Akberov R.R., Islamkhuzin D.Y., Gimranov F.M. Numerical modeling of the atmospheric boundary layer with the account of its stratification // Fundamental research. – 2014. – No.9. – P.1452-1460.
Quote:
#include "udf.h"
#include "mem.h"
#include "flow.h"
DEFINE_SOURCE(xmom_source_K, c, t, dS, eqn)
{
real y, x[ND_ND];
real source;
real mut = C_MU_T(c,t);
C_CENTROID(x, c, t);
y = x[1];
source = -0.00367*(-9.81)*(-9.81)*mut/(0.85*1005);
dS[eqn]=0;
return source;
}
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