void Cconfig::iterate(double time_step)
{
dt=time_step;
dt_on_2 = dt/2.;
dt2_on_2=dt*dt/2.;
predictor(); //motion integration
update_contact(); //find contact and get the force and torque
sum_force(); //sum the force moment of each contact on particle
if(simule_thermal_conduction) sum_heat(); //Heat transfer
//AK addition
if(MELT_SURFTEN){melt_dist();}
cell.rigid_velocity *= 0.0;
corrector(); //acceleration of particles according to the sum of force/moment they experience
cell.rigid_velocity /= parameter.total_mass;
// Velocity offset by rigid motion
#pragma omp parallel for num_threads(NTHREADS) // YG, MPI
for(int ip=0; ip< P.size(); ip++)
P[ip].V -= cell.rigid_velocity;
}
void Cconfig::iterate(double time_step)
{
dt=time_step;
dt_on_2 = dt/2.;
dt2_on_2=dt*dt/2.;
predictor(); //motion integration
update_contact(); //find contact and get the force and torque
sum_force(); //sum the force moment of each contact on particle
if(simule_thermal_conduction) sum_heat(); //Heat transfer
if(LIQUID_TRANSFER) liquid_transfer();
// water input, controlling water volume
if(LIQUID_TRANSFER){
for(int ip=0; ip< P.size(); ip++)
{
// initial
if(dt==0) P[ip].water_volume = parameter.INITIAL_SATURATION * P[ip].void_volume;
if(P[ip].X.x[0]>=-0.5 && P[ip].X.x[0]<=0.5)
P[ip].water_volume = parameter.FIXED_SATURATION * P[ip].void_volume; //exp
P[ip].saturation = P[ip].water_volume/P[ip].void_volume; // update the saturation of each cell
if(P[ip].saturation > MAX_SATURATION) P[ip].saturation = MAX_SATURATION; //exp
}}
cell.rigid_velocity *= 0.0;
corrector(); //acceleration of particles according to the sum of force/moment they experience
cell.rigid_velocity /= parameter.total_mass;
// Velocity offset by rigid motion
//#pragma omp parallel for num_threads(NTHREADS) // YG, MPI
// for(int ip=0; ip< P.size(); ip++)
// P[ip].V -= cell.rigid_velocity;
if(dt==0) {
for(int ip=0; ip< P.size(); ip++) P[ip].V *= 0.0;}
for(int ip=0; ip< P.size(); ip++) {
P[ip].V *= (1.0 - 1.0*dt); // Global damping
P[ip].Ome *= (1.0 - 1.0*dt);
}
// calculation of global and local water pressure.
cap_pressure=0;
for(int ip=0; ip< P.size(); ip++) {
P[ip].water_pressure = 0.0;}
for(int ic=0;ic<C.size();ic++) if(C[ic].fcap >0) {
// cap_pressure -= C[ic].fcap * C[ic].dx;
P[C[ic].A].water_pressure -= C[ic].fcap * C[ic].dx * P[C[ic].A].R /(P[C[ic].A].R+P[C[ic].B].R);
P[C[ic].B].water_pressure -= C[ic].fcap * C[ic].dx * P[C[ic].B].R /(P[C[ic].A].R+P[C[ic].B].R);
}
for(int ip=0; ip< P.size(); ip++) {
// Modified effective stress term with the degree of saturation (micro-scale).
if(P[ip].voronoi_volume>1.0e-10) P[ip].water_pressure /= (3.0 *P[ip].voronoi_volume);
P[ip].positive_pressure = 0.0;
if(P[ip].saturation > 1.0) {
P[ip].positive_pressure = WATER_K*parameter.SURFACE_TENSION *(P[ip].saturation - 1.0); // positive pressure
P[ip].water_pressure += P[ip].positive_pressure;
}
if(P[ip].saturation>=1.0e-10) P[ip].water_pressure /= P[ip].saturation;
}
//Overall saturation and pressure
saturation = 0.0;
// cap_pressure = 0.0;
double void_volume=0.0;
double water_volume=0.0;
for(int ip=0; ip< P.size(); ip++){
void_volume += P[ip].void_volume;
water_volume += P[ip].water_volume;
// Modified effective stress term with the degree of saturation (macro-scale).
// if(P[ip].saturation <= 1.0) cap_pressure -= P[ip].water_pressure * P[ip].water_volume; // modified cap pressure
// else cap_pressure -= P[ip].water_pressure * P[ip].void_volume;
cap_pressure -= P[ip].water_pressure * P[ip].saturation *P[ip].voronoi_volume;
}
saturation = water_volume / void_volume;
if(saturation<1.0e-10) saturation = 1.e-10;
double total_volume = cell.L.x[0]* cell.L.x[1]* cell.L.x[2];
cap_pressure /= saturation * total_volume;
water_content = water_volume /total_volume;
}
void Cconfig::iterate(double time_step)
{
dt=time_step;
dt_on_2 = dt/2.;
dt2_on_2=dt*dt/2.;
predictor(); //motion integration
update_contact(); //find contact and get the force and torque
sum_force(); //sum the force moment of each contact on particle
if(simule_thermal_conduction) sum_heat(); //Heat transfer
if(LIQUID_TRANSFER) liquid_transfer();
// water input, controlling water volume
if(LIQUID_TRANSFER){
if(dt==0) flag_wetting = true;
for(int ip=0; ip< P.size(); ip++)
{
// initial
if(dt==0) {P[ip].water_volume = parameter.INITIAL_SATURATION * P[ip].void_volume;
P[ip].water_volume_old = P[ip].water_volume; }
if(P[ip].void_volume <= 1e-3 * P[ip].grain_volume)
P[ip].void_volume = 1e-3 * P[ip].grain_volume; // avoid negative Void volume
P[ip].saturation = P[ip].water_volume/P[ip].void_volume; // update the saturation of each cell
if(P[ip].saturation > MAX_SATURATION) P[ip].saturation = MAX_SATURATION; //exp
}}
if(!LIQUID_TRANSFER){ // for pre-packing stage
for(int ip=0; ip< P.size(); ip++)
{
P[ip].saturation = 0.1;
P[ip].water_volume = 0.1 * P[ip].void_volume; }}
cell.rigid_velocity *= 0.0;
corrector(); //acceleration of particles according to the sum of force/moment they experience
cell.rigid_velocity /= parameter.total_mass;
// Velocity offset by rigid motion
//#pragma omp parallel for num_threads(NTHREADS) // YG, MPI
for(int ip=0; ip< P.size(); ip++)
P[ip].V -= cell.rigid_velocity;
if(dt==0) {
for(int ip=0; ip< P.size(); ip++) P[ip].V *= 0.0;}
for(int ip=0; ip< P.size(); ip++) {
P[ip].V *= (1.0 - GLOBAL_DAMPING*dt); // Global damping
P[ip].Ome *= (1.0 - GLOBAL_DAMPING*dt);
}
// calculation of global and local water pressure.
for(int ip=0; ip< P.size(); ip++) {
P[ip].water_pressure = 0.0;}
for(int ic=0;ic<C.size();ic++) if(C[ic].fcap >0) {
P[C[ic].A].water_pressure -= C[ic].fcap * C[ic].dx * P[C[ic].A].R /(P[C[ic].A].R+P[C[ic].B].R);
P[C[ic].B].water_pressure -= C[ic].fcap * C[ic].dx * P[C[ic].B].R /(P[C[ic].A].R+P[C[ic].B].R);
}
for(int ip=0; ip< P.size(); ip++) {
// Modified effective stress term with the degree of saturation (micro-scale).
if(P[ip].voronoi_volume>1.0e-10) P[ip].water_pressure /= (3.0 *P[ip].voronoi_volume);
P[ip].positive_pressure = 0.0;
if(P[ip].saturation > MAX_SATURATION_AIR && P[ip].saturation < 1.0) {
P[ip].positive_pressure =
AIR_K *(P[ip].saturation - MAX_SATURATION_AIR)/(1.0 - P[ip].saturation); // positive pressure
P[ip].water_pressure += P[ip].positive_pressure*1.0; // air compression the whole cell experiencing the pressure
}
if(P[ip].saturation>=1.0e-10) P[ip].water_pressure /= P[ip].saturation;
}
//Overall saturation and pressure
saturation = 0.0;
cap_pressure = 0.0;
double void_volume=0.0;
double water_volume=0.0;
double total_volume_mid = 0.0;
cap_pressure_mid = 0.0;
double void_volume_mid=0.0;
double water_volume_mid=0.0;
for(int ip=0; ip< P.size(); ip++){
void_volume += P[ip].void_volume;
water_volume += P[ip].water_volume;
// Modified effective stress term with the degree of saturation (macro-scale).
// if(P[ip].saturation <= 1.0) cap_pressure -= P[ip].water_pressure * P[ip].water_volume; // modified cap pressure
// else cap_pressure -= P[ip].water_pressure * P[ip].void_volume;
cap_pressure -= P[ip].water_pressure * P[ip].saturation *P[ip].voronoi_volume;
if(P[ip].X.x[1] <= 5.0 && P[ip].X.x[1] >= -5.0){
void_volume_mid += P[ip].void_volume;
water_volume_mid += P[ip].water_volume;
cap_pressure_mid -= P[ip].water_pressure * P[ip].saturation *P[ip].voronoi_volume;
total_volume_mid += P[ip].voronoi_volume;
}
}
saturation = water_volume / void_volume;
if(saturation < 1.0e-10) saturation = 1.e-10;
double total_volume = cell.L.x[0]* cell.L.x[1]* cell.L.x[2];
cap_pressure /= saturation * total_volume;
water_content = water_volume /total_volume;
saturation_mid = water_volume_mid / void_volume_mid;
if(saturation_mid<1.0e-10) saturation_mid = 1.e-10;
if(total_volume_mid > 0.0){
cap_pressure_mid /= saturation_mid * total_volume_mid;
water_content_mid = water_volume_mid /total_volume_mid;
}
if(saturation >= MAX_SCAN && t>1.0 && flag_wetting) flag_wetting=false;
if(saturation <= MIN_SCAN && t>1.0 && !flag_wetting) flag_wetting=true;
}