Fluid::Fluid()
{
int i;
for (i=0; i<10; i++)
clear_buffer(buffers[i]);
i=0;
d=buffers[i++]; d0=buffers[i++];
T=buffers[i++]; T0=buffers[i++];
u=buffers[i++]; u0=buffers[i++];
v=buffers[i++]; v0=buffers[i++];
w=buffers[i++]; w0=buffers[i++];
clear_sources();
int size=(N+2)*(N+2)*(N+2);
for (i=0; i<size; i++)
v[i] = -0.5f;
}
void Alert::set_sources(const std::vector<Alert::Node> &sources) {
clear_sources();
for (unsigned int i = 0; i < sources.size(); i++)
add_source(sources[i]);
}
int vtt_ini (void)
{
int i, j, cnst_delay;
float Alip;
float pi = 3.141593;
/*** Initialize decimation filter ***/
deci = simfrq/smpfrq;
dt_sim = 1./simfrq;
cnst_delay = decim_init();
/*** Initialize random number generation ***/
if(noise_source == ON)
{ frictionNoise3(0, inMemGlt, outMemGlt, &lowMemGlt);
frictionNoise3(0, inMemAc, outMemAc, &lowMemAc);
}
/*** Coefficients for computing acoustic-aerodynamic elements ***/
/* flow registance */
K_Bernoulli = Kc*ro; /* Bernoulli kinetic resistance */
/* The Kc value depends on the cross-section shape: =1.42 for
the glottis (rectangular) and more close to 1. for a supraglottal
constriction. For the simplicity sake, the single value is
used for the two cases. R = K_Bernoulli*Udc/(A*A) for full length
*/
K_viscous_glotte = 12.*lg*lg*xg*mu/2.;
/* The K formula assumes a rectangular duct, and is applicable
only at the glottis. R = K_viscous_glotte/(A*A*A) for a half
length */
K_viscous_const = (8.*pi*mu)/2.0; /* viscous resistance */
/* The K formula assumes a circular duct, and is applicable
only at the superglottal constriction (Stevens, 1971).
R = K_viscous_const*dx/(A*A) for a half length. Note that
viscous resistance is not same as "wall friction loss" used
in the frequency domain calculation, which is a function of
wall surface and frequency */
/* acoustic elements */
La = (2.0/dt_sim)*(ro/2.0); /* acoustic mass (La) */
Ca = (2.0/dt_sim)/(ro*c*c); /* acoustic stiffness (1/Ca) */
/* walls */
Rw = wall_resi/(2.0*sqrt(pi)); /* VT walls */
Lw = (2.0/dt_sim)*wall_mass/(2.0*sqrt(pi));
Cw = (dt_sim/2.0)*wall_comp/(2.0*sqrt(pi));
if(subGLTsystem == ON)
{ Rt = trachea_resi/(2.0*sqrt(pi)); /* VT walls */
Lt = (2.0/dt_sim)*trachea_mass/(2.0*sqrt(pi));
Ct = (dt_sim/2.0)*trachea_comp/(2.0*sqrt(pi));
}
/* radiation impedance; 1/G_rad and 1/S_rad in parallel */
Grad = (9.0*pi*pi)/(128.0*ro*c); /* conductance (G_rad) */
Srad = (dt_sim/2.0)*(3.0*pi*sqrt(pi))/(8.0*ro);/* suceptance (S_rad) */
/* radiated sound pressure at 1 m */
Kr = ro*simfrq/(2.0*pi*100.0);
/*** address and memory allocation ***/
/* tracheal tube */
Ng = 0;
if(subGLTsystem == ON)
{ Ng = ntr;
ntr1 = ntr + 1;
actr = (td_acoustic_elements *) calloc(ntr1, sizeof(td_acoustic_elements));
}
/* main tract : parynx + {mouth} */
if(nasal_tract == ON) nvt0 = nbp; /* pharynx */
else nvt0 = nvt; /* parynx + mouth */
nvt1 = nvt0 + 1;
af = (area_function *) calloc(nvt0, sizeof(area_function));
daf = (area_function *) calloc(nvt0, sizeof(area_function));
ac = (td_acoustic_elements *) calloc(nvt1, sizeof(td_acoustic_elements));
/* entire tract for equation elements : {trachea}+glottis+pyarynx+{mouth} */
if(nasal_tract == ON) n0 = nbp; /* pharynx */
else n0 = nvt; /* parynx + mouth */
n0++; /* +1 for glottal section */
if(subGLTsystem == ON) n0 += ntr; /* + tracheal sections */
n2 = 2*n0;
n3 = n2 + 1;
n4 = n2 + 2;
n5 = n2 + 3;
eq = (td_linear_equation *) calloc(n5, sizeof(td_linear_equation));
if(nasal_tract == ON)
{
/* mouth cavity */
nbu0 = nvt - nbp; /* # of bucal sections */
nbu1 = nbu0 + 1;
nbu3 = 2*nbu0 + 1;
nbu4 = 2*nbu0 + 2;
nbu5 = 2*nbu0 + 3;
nbu6 = 2*nbu0 + 4;
afbu = (area_function *) calloc(nbu0, sizeof(area_function));
dafbu = (area_function *) calloc(nbu0, sizeof(area_function));
acbu = (td_acoustic_elements *) calloc(nbu1, sizeof(td_acoustic_elements));
eqbu = (td_linear_equation *) calloc(nbu6, sizeof(td_linear_equation));
/* nasal coupling sections */
nnc1 = nnc + 1;
afnc = (area_function *) calloc(nnc, sizeof(area_function));
dafnc = (area_function *) calloc(nnc, sizeof(area_function));
acnc = (td_acoustic_elements *) calloc(nnc1, sizeof(td_acoustic_elements));
/* fixed nasal tract */
nna0 = nnt - nnc;
nna1 = nna0 + 1;
afna = (area_function *) calloc(nna0, sizeof(area_function));
acna = (td_acoustic_elements *) calloc(nna1, sizeof(td_acoustic_elements));
/* entire nasal tract */
nnt3 = 2*nnt + 1;
nnt4 = 2*nnt + 2;
nnt5 = 2*nnt + 3;
nnt6 = 2*nnt + 4;
eqnt = (td_linear_equation *) calloc(nnt6, sizeof(td_linear_equation));
}
/*** Clear memories ***/
/* current/voltage sources associated with reactances */
if(subGLTsystem == ON) clear_sources(ntr1, actr);
clear_sources(nglt1, acglt);
clear_sources(nvt1, ac);
iLrad_lip = 0.;
if(nasal_tract == ON)
{ clear_sources(nbu1, acbu);
clear_sources(nnc1, acnc);
clear_sources(nna1, acna);
iLrad_nos = 0.;
}
/* clear volume velocities and central pressures */
clear_PU(n5, eq);
U1_lip = 0;
if(nasal_tract == ON)
{ clear_PU(nbu6, eqbu);
clear_PU(nnt6, eqnt);
U1_nos = 0;
}
/* set constant values for S and W */
eq[0].S = H2O_bar*Psub; /* lung air-pressure */
eq[0].W = 1.0;
if(nasal_tract == ON)
{ eqbu[nbu5].S = 0.;
eqbu[nbu5].W = 1.0;
eqnt[nnt5].S = 0;
eqnt[nnt5].W = 1.0;
}
/*** Copy initial area function of time-varying tubes ***/
copy_initial_af_t();
/*** find the constriction forward and farest from the glottis ***/
find_constriction();
/**** Fixed acoustic elements ****/
/* lungs */
Rlungs = 1.5/sqrt(600); /* ?? */
/* trachea */
if(subGLTsystem == ON) acous_elements_t(TRACHEA, ntr, aftr, actr);
/* fixed part of the nasal tract */
if(nasal_tract == ON)
{ NTacous_elements_t(nna0, afna, acna);
/* radiation load at the nostrils */
if(rad_boundary == RL_CIRCUIT)
{ Grad_nos = Grad*afnt[nnt-1].A;
Lrad_nos = Srad*sqrt(afnt[nnt-1].A);
}
else
{ Grad_nos = 5000.; /* short circuit */
Lrad_nos = 0.;
}
eqnt[nnt4].w = Grad_nos + Lrad_nos;
}
/* stationary case */
if(vocal_tract == STATIONARY) refresh_acoustic_elements();
return( cnst_delay );
}
int vtt_ini ( void )
{
int i, cnst_delay;
float pi = 3.141593f;
nph2 = 2*nph; nph3 = nph2+1; nph4 = nph2+2;
nbu2 = 2*nbu; nbu3 = nbu2+1; nbu4 = nbu2+2;
nna2 = 2*nna; nna3 = nna2+1; nna4 = nna2+2;
deci = (int)(simfrq/smpfrq);
dt_sim = (float)(1./simfrq);
cnst_delay = decim_init();
/*** Coefficients for computing acoustic-aerodynamic elements ***/
/* flow registance */
Rk = (float)(1.2*ro); /* kinetic resistance */
/* The Rk value depends on the cross-section shape: =1.38 for
the glottis (rectangular) and =1. for a supragrottal
constriction. For the simplicity sake, the single value is
used for the two cases. */
Rv = (float)((0.8*pi*mu)/2.0); /* viscus resistance */
/* The vr value depends on the shapes. The difference is
relativly small, and the single value will be used. */
/* acoustic elements */
La = (float)((2.0/dt_sim)*(ro/2.0)); /* acoustic mass (La) */
Ca = (float)((2.0/dt_sim)/(ro*c*c)); /* acoustic stiffness (1/Ca) */
/* walls */
Rw = (float)(wall_resi/(2.0*sqrt(pi)));
Lw = (float)((2.0/dt_sim)*wall_mass/(2.0*sqrt(pi)));
Cw = (float)((dt_sim/2.0)*wall_comp/(2.0*sqrt(pi)));
/* radiation impedance; 1/G_rad and 1/S_rad in parallel */
Grad = (float)((9.0*pi*pi)/(128.0*ro*c)); /* conductance (G_rad) */
Srad = (float)((dt_sim/2.0)*(3.0*pi*sqrt(pi))/(8.0*ro));/* suceptance (S_rad) */
/* radiated sound pressure at 1 m */
Kr = (float)(ro*simfrq/(2.0*pi*100.0));
/*** memory allocations ***/
afph = (area_function *) calloc( nph, sizeof(area_function) );
dph = (area_function *) calloc( nph, sizeof(area_function) );
acph = (td_acoustic_elements *) calloc( nph+1, sizeof(td_acoustic_elements) );
eqph = (td_linear_equation *) calloc( 2*nph+3, sizeof(td_linear_equation) );
afbu = (area_function *) calloc( nbu, sizeof(area_function) );
dbu = (area_function *) calloc( nbu, sizeof(area_function) );
acbu = (td_acoustic_elements *) calloc( nbu+1, sizeof(td_acoustic_elements) );
eqbu = (td_linear_equation *) calloc( 2*nbu+3, sizeof(td_linear_equation) );
dna = (area_function *) calloc( nna, sizeof(area_function) );
acna = (td_acoustic_elements *) calloc( nna+1, sizeof(td_acoustic_elements) );
eqna = (td_linear_equation *) calloc( 2*nna+3, sizeof(td_linear_equation) );
/*** Initalization of memory terms ***/
/* current/voltage sources associated with reactances */
clear_sources( nph, acph );
clear_sources( nbu, acbu );
irad_lips = 0;
clear_sources( nna, acna );
irad_nose = 0;
/* initial volume velocities and central pressures (the rest condition) */
clear_pu( nph4, eqph );
clear_pu( nbu4, eqbu );
U1_lips = 0;
clear_pu( nna4, eqna );
U1_nose = 0;
/**** Acoustic and matrix elements ****/
copy_initial_af_t(); /* copy the initial area function */
dax();
/* pharyngeal tract */
acou_mtrx( nph, afph, dph, acph, eqph, 0., 0.);
Ag = nonzero_t( Ag ); /* add glottal resistance */
eqph[1].w = (float)(eqph[1].w +( Rv*xg/Ag + Rk*fabs(eqph[1].x) )/(Ag*Ag));
/* bucal cavity */
acou_mtrx( nbu, afbu, dbu, acbu, eqbu, 0., 0.);
/* nasal tract */
acou_mtrx( nna-1, afnt, dna, acna, eqna, 0., 0. );
for(i=1; i<=nna3; i+=2) eqna[i].w += 0.1f; /* add some extra loss */
Rs_na = acna[nna-2].Rs; /* left arm of the inlet*/
Ls_na = acna[nna-2].Ls; /* to the nasal tract. */
acou_mtrx(1, afnc, dnc, acna+nna-1, eqna+2*(nna-1), Rs_na, Ls_na);
/* Radiation loads */
if( rad_boundary == RL_CIRCUIT )
{ Grad_lips = Grad*afbu[0].A; /* radiation conductance */
Lrad_lips = (float)(Srad*sqrt(afbu[0].A)); /* radiation suceptance */
eqbu[0].w = Grad_lips + Lrad_lips; /* rad. admitance */
Grad_nose = Grad*afnt[0].A;
Lrad_nose = (float)(Srad*sqrt(afnt[0].A));
eqna[0].w = Grad_nose + Lrad_nose;
}
else
{ eqbu[0].w = 5.0; /* short circuit */
eqna[0].w = 5.0;
}
return( cnst_delay );
}
