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Traction.cpp
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Traction.cpp
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/***********************************************************************************
* PersianSPH - A C++ library to simulate Mechanical Systems (solids, fluids *
* and soils) using Smoothed Particle Hydrodynamics method *
* Copyright (C) 2013 Maziar Gholami Korzani and Sergio Galindo-Torres *
* *
* This file is part of PersianSPH *
* *
* This is free software; you can redistribute it and/or modify it under the *
* terms of the GNU General Public License as published by the Free Software *
* Foundation; either version 3 of the License, or (at your option) any later *
* version. *
* *
* This program is distributed in the hope that it will be useful, but WITHOUT ANY *
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A *
* PARTICULAR PURPOSE. See the GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License along with *
* PersianSPH; if not, see <http://www.gnu.org/licenses/> *
************************************************************************************/
#include "Domain.h"
#include "InteractionAlt.cpp"
#include "SolverFraser.cpp"
#include "SolverLeapfrog.cpp"
#define TAU 0.005
#define VMAX 1.0
#define DX 0.012
std::ofstream of;
void UserAcc(SPH::Domain & domi)
{
double vtraction;
if (domi.getTime() < TAU )
vtraction = VMAX/TAU * domi.getTime();
else
vtraction = VMAX;
double ext_work = 0.;
#pragma omp parallel for schedule (static) num_threads(domi.Nproc)
#ifdef __GNUC__
for (size_t i=0; i<domi.Particles.Size(); i++)
#else
for (int i=0; i<domi.Particles.Size(); i++)
#endif
{
if (domi.Particles[i]->ID == 3)
{
domi.Particles[i]->a = Vec3_t(0.0,0.0,0.0);
domi.Particles[i]->v = Vec3_t(0.0,0.0,vtraction);
domi.Particles[i]->va = Vec3_t(0.0,0.0,vtraction);
domi.Particles[i]->vb = Vec3_t(0.0,0.0,vtraction);
ext_work += domi.Particles[i]->Sigma (2,2) * DX * DX * domi.Particles[i]->Displacement(2);
// domi.Particles[i]->VXSPH = Vec3_t(0.0,0.0,0.0);
}
if (domi.Particles[i]->ID == 2)
{
domi.Particles[i]->a = Vec3_t(0.0,0.0,0.0);
domi.Particles[i]->v = Vec3_t(0.0,0.0,0.0);
domi.Particles[i]->va = Vec3_t(0.0,0.0,0.0);
domi.Particles[i]->vb = Vec3_t(0.0,0.0,0.0);
domi.Particles[i]->VXSPH = Vec3_t(0.0,0.0,0.0);
}
}
of << domi.getTime() << ", " << domi.int_energy_sum << ", "<< domi.kin_energy_sum<<", "<<ext_work<<endl;
}
using std::cout;
using std::endl;
int main(int argc, char **argv) try
{
SPH::Domain dom;
dom.Dimension = 3;
dom.Nproc = 4;
dom.Kernel_Set(Qubic_Spline);
dom.Scheme = 1; //Mod Verlet
//dom.XSPH = 0.5; //Very important
double dx,h,rho,K,G,Cs,Fy;
double R,L,n;
double Lz_side,Lz_neckmin,Lz_necktot,Rxy_center;
R = 0.075;
Lz_side =0.2;
Lz_neckmin = 0.050;
Lz_necktot = 0.100;
Rxy_center = 0.050;
L = 2. * Lz_side + Lz_necktot;
double E = 210.e9;
//double Et = 0.1 * E;
double Et = 0.0 * E;
double Ep = E*Et/(E-Et); //TODO: Move To Material
double nu = 0.3;
rho = 7850.0;
K= E / ( 3.*(1.-2*nu) );
G= E / (2.* (1.+nu));
Fy = 350.e6;
//dx = 0.0085;
dx = DX;
h = dx*1.2; //Very important
Cs = sqrt(K/rho);
double timestep;
//timestep = (0.2*h/(Cs));
//timestep = 2.5e-6;
timestep = 5.e-7;
cout<<"t = "<<timestep<<endl;
cout<<"Cs = "<<Cs<<endl;
cout<<"K = "<<K<<endl;
cout<<"G = "<<G<<endl;
cout<<"Fy = "<<Fy<<endl;
dom.GeneralAfter = & UserAcc;
dom.DomMax(0) = L;
dom.DomMin(0) = -L;
// inline void Domain::AddCylinderLength(int tag, Vec3_t const & V, double Rxy, double Lz,
// double r, double Density, double h, bool Fixed) {
//dom.auto_ts = false;
dom.AddTractionProbeLength(1, Vec3_t(0.,0.,-Lz_side/5.), R, Lz_side + Lz_side/5.,
Lz_neckmin,Lz_necktot,Rxy_center,
dx/2., rho, h, false);
cout << "Particle count: "<<dom.Particles.Size()<<endl;
//dom.Particles[6777]->print_history = true;
// dom.Particles[4081]->print_history = true; //If dx=10mm
// dom.Particles[4081]->ID = 4;
//If dx=12mm
dom.Particles[2421]->print_history = true; //Particle 2421, 3 [ -0.006 -0.006 0.242 ]
dom.ts_nb_inc = 1.;
cout << "Ep: " <<Ep<<endl;
for (size_t a=0; a<dom.Particles.Size(); a++)
{
dom.Particles[a]->Ep = Ep;//HARDENING
dom.Particles[a]->G = G;
dom.Particles[a]->PresEq = 0;
dom.Particles[a]->Cs = Cs;
dom.Particles[a]->Shepard = false;
dom.Particles[a]->Material = 2;
dom.Particles[a]->Fail = 1;
dom.Particles[a]->Sigmay = Fy;
dom.Particles[a]->Alpha = 1.0;
dom.Particles[a]->TI = 0.3;
dom.Particles[a]->TIInitDist = dx;
double z = dom.Particles[a]->x(2);
if ( z < 0 ){
dom.Particles[a]->ID=2;
// dom.Particles[a]->IsFree=false;
// dom.Particles[a]->NoSlip=true;
}
if ( z > L )
dom.Particles[a]->ID=3;
}
dom.WriteXDMF("maz");
// dom.m_kernel = SPH::iKernel(dom.Dimension,h);
of = std::ofstream ("cf.csv", std::ios::out);
of << "Time, int_energy, kin_energy, ext_work"<<endl;
//dom.Solve(/*tf*/0.0505,/*dt*/timestep,/*dtOut*/0.0001,"test06",999);
timestep = (1.0*h/(Cs)); //Standard modified Verlet do not accept such step
dom.auto_ts=false;
//dom.SolveDiffUpdateLeapFrog(/*tf*/0.0105,/*dt*/timestep,/*dtOut*/1.e-4 ,"test06",1000);
dom.SolveDiffUpdateFraser(/*tf*/0.105,/*dt*/timestep,/*dtOut*/1.e-4 ,"test06",1000);
return 0;
}
// // IF dx = 0.0085 (about 12k particles)
// // Particle 6106, 3 [ -0.00425 -0.00425 0.23925 ]
// // Particle 6107, 3 [ 0.00425 -0.00425 0.23925 ]
// // Particle 6116, 3 [ -0.00425 0.00425 0.23925 ]
// // Particle 6117, 3 [ 0.00425 0.00425 0.23925 ]
// // Particle 6194, 3 [ -0.00425 -0.00425 0.24775 ]
// // Particle 6195, 3 [ 0.00425 -0.00425 0.24775 ]
// // Particle 6204, 3 [ -0.00425 0.00425 0.24775 ]
// // Particle 6205, 3 [ 0.00425 0.00425 0.24775 ]
MECHSYS_CATCH