static vec3 expected_acceleration(double time, const struct rocket_state *rocket_state)
{
/* TODO: add coefficient of normal force at the center of pressure */
vec3 force = vec_add(thrust_force(rocket_state, (microseconds) time), drag_force(rocket_state));
vec3 accel = vec_add(gravity_acceleration(rocket_state), vec_scale(force, 1/mass));
geodetic pos = ECEF_to_geodetic(rocket_state->pos);
if(pos.altitude <= initial_geodetic.altitude){
mat3 rot = make_LTP_rotation(pos);
ground_clip(&accel, rot);
}
return accel;
}
void Cconfig::sum_force()
{
Cmatrix stress;
Cvector g;//vector gravity
if(cell.boundary=="WALL_INCLINED"){
g.x[0]= cell.gravity*sin(PI/180 * cell.slope );
g.x[1]= -cell.gravity*cos(PI/180 * cell.slope );
g.x[2]=0;
}// else g is null
#pragma omp parallel for num_threads(NTHREADS) // YG, MPI
for(int ip=0; ip< P.size();ip++)
{
P[ip].Fsum = (g*P[ip].m);
P[ip].Gsum*=0;
}
if(LIQUID_TRANSFER) drag_force();
// YG, no MPI
for(int ic=0;ic<C.size();ic++)
{
Cvector dx;
P[C[ic].A].Fsum += C[ic].F;
P[C[ic].B].Fsum -= C[ic].F;
P[C[ic].A].Gsum += (C[ic].RA^C[ic].F) +C[ic].G;
P[C[ic].B].Gsum -= (C[ic].RB^C[ic].F) +C[ic].G;
// Additional force due to positive water pressure, CHECK !!
Cvector FWATER_A = C[ic].nA * (P[C[ic].B].positive_pressure)*C[ic].voronoi_area;
Cvector FWATER_B = C[ic].nA * (P[C[ic].A].positive_pressure)*C[ic].voronoi_area;
P[C[ic].A].Fsum -= FWATER_A;
P[C[ic].B].Fsum += FWATER_B;
dx = C[ic].dX;
stress+= (C[ic].F| dx);
}
double positive_pressure =0.0;
for(int ip=0; ip<P.size();ip++){
// positive pressure, contribute to the full domain, using voronoi_volume !
positive_pressure += P[ip].positive_pressure * P[ip].voronoi_volume;
// if(P[ip].saturation <= 1.0) positive_pressure += P[ip].positive_pressure * P[ip].water_volume;
// else positive_pressure += P[ip].positive_pressure * P[ip].void_volume;
}
for(int ii=0;ii<3;ii++)
stress.x[ii][ii] -= positive_pressure;
if(PSEUDO_2D) stress/=(cell.L.x[0]*cell.L.x[1]);
else stress/=(cell.L.x[0]*cell.L.x[1]*cell.L.x[2]);
//cell.stress = stress.symetric();
cell.stress =stress;
if(cell.boundary!="WALL_INCLINED") return;
cell.normal_stress_in=0;
cell.shear_stress_in=0;
for(int ic=0;ic<C.size();ic++)
{
if(P[C[ic].A].AM_I_BOUNDARY==-1||P[C[ic].A].AM_I_BOUNDARY==-2){ cell.normal_stress_in+=C[ic].F.x[1]; cell.shear_stress_in+=C[ic].F.x[0];}
if(P[C[ic].B].AM_I_BOUNDARY==-1||P[C[ic].B].AM_I_BOUNDARY==-2){ cell.normal_stress_in-=C[ic].F.x[1]; cell.shear_stress_in-=C[ic].F.x[0];}
}
cell.normal_stress_in/=(cell.L.x[0]* cell.L.x[2]);cell.shear_stress_in/=(cell.L.x[0]* cell.L.x[2]);
cell.normal_stress_in*=-1;//get it positive in compression
}
void Cconfig::sum_force()
{
Cmatrix stress, stressEff;
// stress *= 0; stressEff *= 0;
Cvector g = cell.g;
#pragma omp parallel for num_threads(NTHREADS) // YG, MPI
for(int ip=0; ip< P.size();ip++)
{
P[ip].Fsum = (g*P[ip].m);
P[ip].Gsum*=0;
}
if(LIQUID_TRANSFER) drag_force();
// YG, no MPI
for(int ic=0;ic<C.size();ic++)
{
Cvector dx;
P[C[ic].A].Fsum += C[ic].F;
if(C[ic].B >=0) P[C[ic].B].Fsum -= C[ic].F;
P[C[ic].A].Gsum += (C[ic].RA^C[ic].F) +C[ic].G;
if(C[ic].B >=0) P[C[ic].B].Gsum -= (C[ic].RB^C[ic].F) +C[ic].G;
if(LIQUID_TRANSFER && C[ic].B >=0){
// Additional force due to positive water pressure, CHECK !!
Cvector FWATER_A = C[ic].nA * (P[C[ic].B].positive_pressure)*C[ic].voronoi_area;
Cvector FWATER_B = C[ic].nA * (P[C[ic].A].positive_pressure)*C[ic].voronoi_area;
// C[ic].fwater = (P[C[ic].A].positive_pressure + P[C[ic].B].positive_pressure)*C[ic].voronoi_area/2.0;
P[C[ic].A].Fsum += FWATER_A;
P[C[ic].B].Fsum -= FWATER_B;
}
dx = C[ic].dX;
stress+= (C[ic].F| dx);
stressEff += (C[ic].FEff| dx); // Effective stress
}
if(LIQUID_TRANSFER){
double positive_pressure =0.0;
for(int ip=0; ip<P.size();ip++){
// positive pressure, contribute to the full domain, using voronoi_volume !
positive_pressure += P[ip].positive_pressure * P[ip].voronoi_volume;
// if(P[ip].saturation <= 1.0) positive_pressure += P[ip].positive_pressure * P[ip].water_volume;
// else positive_pressure += P[ip].positive_pressure * P[ip].void_volume;
}
for(int ii=0;ii<3;ii++)
stress.x[ii][ii] -= positive_pressure;
}
if(PSEUDO_2D) stress/=(cell.L.x[0]*cell.L.x[1]);
else stress/=(cell.L.x[0]*cell.L.x[1]*cell.L.x[2]);
if(PSEUDO_2D) stressEff /=(cell.L.x[0]*cell.L.x[1]);
else stressEff /=(cell.L.x[0]*cell.L.x[1]*cell.L.x[2]);
//cell.stress = stress.symetric();
cell.stress =stress;
cell.stressEff =stressEff;
cell.normal_stress_in = stress.x[1][1];
cell.shear_stress_in = stress.x[0][1];
if(cell.boundary!="WALL_INCLINED" && cell.boundary != "BALL_BOX_Y") return;
cell.normal_stress_bottom = 0.0;
cell.shear_stress_bottom = 0.0;
cell.normal_stress_top = 0.0;
cell.shear_stress_top = 0.0;
for(int ic=0;ic<C.size();ic++)
{
if(C[ic].B >= 0){
// grain-grain contact at the bottom
if(P[C[ic].A].AM_I_BOUNDARY==-1||P[C[ic].A].AM_I_BOUNDARY==-2){ cell.normal_stress_bottom+=C[ic].F.x[1]; cell.shear_stress_bottom+=C[ic].F.x[0];}
if(P[C[ic].B].AM_I_BOUNDARY==-1||P[C[ic].B].AM_I_BOUNDARY==-2){ cell.normal_stress_bottom-=C[ic].F.x[1]; cell.shear_stress_bottom-=C[ic].F.x[0];}
// grain-grain contact at the top
if(P[C[ic].A].AM_I_BOUNDARY==1||P[C[ic].A].AM_I_BOUNDARY==2){ cell.normal_stress_top+=C[ic].F.x[1]; cell.shear_stress_top+=C[ic].F.x[0];}
if(P[C[ic].B].AM_I_BOUNDARY==1||P[C[ic].B].AM_I_BOUNDARY==2){ cell.normal_stress_top-=C[ic].F.x[1]; cell.shear_stress_top-=C[ic].F.x[0];}
}
if(C[ic].B == -3) // grain-wall contact at the bottom
{cell.normal_stress_bottom-=C[ic].F.x[1]; cell.shear_stress_bottom-=C[ic].F.x[0];}
if(C[ic].B == -4) // grain-wall contact at the top
{cell.normal_stress_top-=C[ic].F.x[1]; cell.shear_stress_top-=C[ic].F.x[0];}
}
cell.normal_stress_bottom/=(cell.L.x[0]* cell.L.x[2]);
cell.shear_stress_bottom/=(cell.L.x[0]* cell.L.x[2]);
cell.normal_stress_bottom*=-1; //bottom: normal stress direction, get it positive in compression
cell.normal_stress_top/=(cell.L.x[0]* cell.L.x[2]);
cell.shear_stress_top/=(cell.L.x[0]* cell.L.x[2]);
cell.shear_stress_top*=-1; // top: shear stress direction
}
