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openEMS/FDTD/extensions/operator_ext_pml_sf.cpp

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/*
* Copyright (C) 2010 Thorsten Liebig (Thorsten.Liebig@gmx.de)
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "operator_ext_pml_sf.h"
#include "engine_ext_pml_sf.h"
#include "FDTD/operator_cylinder.h"
#include "tools/array_ops.h"
#include "fparser.hh"
bool Build_Split_Field_PML(Operator* op, int BC[6], int size[6], string gradFunc)
{
for (int n=0; n<6; ++n)
{
if (BC[n]==3) //split field PML
{
Operator_Ext_PML_SF_Plane* op_pml_sf = new Operator_Ext_PML_SF_Plane(op);
op_pml_sf->SetDirection(n/2,n%2);
if ((size[n]<4) || (size[n]>50))
{
cerr << "Build_Split_Field_PML: Warning, pml size invalid, skipping pml..." << endl;
delete op_pml_sf;
continue;
}
op_pml_sf->SetPMLLength(size[n]);
op_pml_sf->SetBoundaryCondition(BC);
if (!op_pml_sf->SetGradingFunction(gradFunc))
{
cerr << "Build_Split_Field_PML: Warning, pml grading function invalid, skipping pml..." << endl;
delete op_pml_sf;
continue;
}
cerr << "Build_Split_Field_PML:: Warning, currently only pml planes are implemented... edges and corner coming soon..." << endl;
op->AddExtension(op_pml_sf);
}
}
return true;
}
/************************************************ Operator_Ext_PML_SF **************************************************************************/
Operator_Ext_PML_SF::Operator_Ext_PML_SF(Operator* op) : Operator_Extension(op)
{
m_SetupDone = false;
m_numLines[0]=0;
m_numLines[1]=0;
m_numLines[2]=0;
vv[0] = NULL;
vv[1] = NULL;
vi[0] = NULL;
vi[1] = NULL;
ii[0] = NULL;
ii[1] = NULL;
iv[0] = NULL;
iv[1] = NULL;
for (int n=0; n<6; ++n)
m_BC[n]=0;
m_GradingFunction = new FunctionParser();
//default grading function
SetGradingFunction(" -log(1e-6)*log(2.5)/(2*dl*pow(2.5,W/dl)-1) * pow(2.5, D/dl) / Z ");
}
Operator_Ext_PML_SF::~Operator_Ext_PML_SF()
{
delete m_GradingFunction;
m_GradingFunction = NULL;
DeleteOP();
}
void Operator_Ext_PML_SF::InitOP()
{
if (!m_SetupDone)
return;
vv[0] = Create_N_3DArray<FDTD_FLOAT>(m_numLines);
vv[1] = Create_N_3DArray<FDTD_FLOAT>(m_numLines);
vi[0] = Create_N_3DArray<FDTD_FLOAT>(m_numLines);
vi[1] = Create_N_3DArray<FDTD_FLOAT>(m_numLines);
ii[0] = Create_N_3DArray<FDTD_FLOAT>(m_numLines);
ii[1] = Create_N_3DArray<FDTD_FLOAT>(m_numLines);
iv[0] = Create_N_3DArray<FDTD_FLOAT>(m_numLines);
iv[1] = Create_N_3DArray<FDTD_FLOAT>(m_numLines);
}
void Operator_Ext_PML_SF::DeleteOP()
{
if (!m_SetupDone)
return;
Delete_N_3DArray<FDTD_FLOAT>(vv[0],m_numLines);
vv[0] = NULL;
Delete_N_3DArray<FDTD_FLOAT>(vv[1],m_numLines);
vv[1] = NULL;
Delete_N_3DArray<FDTD_FLOAT>(vi[0],m_numLines);
vi[0] = NULL;
Delete_N_3DArray<FDTD_FLOAT>(vi[1],m_numLines);
vi[1] = NULL;
Delete_N_3DArray<FDTD_FLOAT>(ii[0],m_numLines);
ii[0] = NULL;
Delete_N_3DArray<FDTD_FLOAT>(ii[1],m_numLines);
ii[1] = NULL;
Delete_N_3DArray<FDTD_FLOAT>(iv[0],m_numLines);
iv[0] = NULL;
Delete_N_3DArray<FDTD_FLOAT>(iv[1],m_numLines);
iv[1] = NULL;
}
bool Operator_Ext_PML_SF::SetGradingFunction(string func)
{
if (func.empty())
return true;
m_GradFunc = func;
int res = m_GradingFunction->Parse(m_GradFunc.c_str(), "D,dl,W,Z,N");
if (res < 0) return true;
cerr << "Operator_Ext_PML_SF::SetGradingFunction: Warning, an error occured parsing the pml grading function (see below) ..." << endl;
cerr << func << "\n" << string(res, ' ') << "^\n" << m_GradingFunction->ErrorMsg() << "\n";
return false;
}
bool Operator_Ext_PML_SF::BuildExtension()
{
if (!m_SetupDone)
{
cerr << "Operator_Ext_PML_SF::BuildExtension: Warning, Extension not initialized! Abort build!!" << endl;
return false;
}
double dT = m_Op->GetTimestep();
unsigned int pos[] = {0,0,0};
DeleteOP();
InitOP();
double inEC[4];
for (int n=0; n<3; ++n)
{
for (pos[0]=0; pos[0]<m_numLines[0]; ++pos[0])
{
for (pos[1]=0; pos[1]<m_numLines[1]; ++pos[1])
{
for (pos[2]=0; pos[2]<m_numLines[2]; ++pos[2])
{
Calc_ECPos(0,n,pos,inEC);
if (inEC[0]>0)
GetVV(0,n,pos[0],pos[1],pos[2]) = (1-dT*inEC[1]/2/inEC[0])/(1+dT*inEC[1]/2/inEC[0]);
if (inEC[2]>0)
GetII(0,n,pos[0],pos[1],pos[2]) = (1-dT*inEC[3]/2/inEC[2])/(1+dT*inEC[3]/2/inEC[2]);
if (inEC[0]>0)
GetVI(0,n,pos[0],pos[1],pos[2]) = (dT/inEC[0])/(1+dT*inEC[1]/2/inEC[0]);
if (inEC[2]>0)
GetIV(0,n,pos[0],pos[1],pos[2]) = (dT/inEC[2])/(1+dT*inEC[3]/2/inEC[2]);
// if (n==0)
// cerr << pos[0] << " " << pos[1] << " " << pos[2] << " " << inEC[1] << endl;
Calc_ECPos(1,n,pos,inEC);
if (inEC[0]>0)
GetVV(1,n,pos[0],pos[1],pos[2]) = (1-dT*inEC[1]/2/inEC[0])/(1+dT*inEC[1]/2/inEC[0]);
if (inEC[2]>0)
GetII(1,n,pos[0],pos[1],pos[2]) = (1-dT*inEC[3]/2/inEC[2])/(1+dT*inEC[3]/2/inEC[2]);
if (inEC[0]>0)
GetVI(1,n,pos[0],pos[1],pos[2]) = (dT/inEC[0])/(1+dT*inEC[1]/2/inEC[0]);
if (inEC[2]>0)
GetIV(1,n,pos[0],pos[1],pos[2]) = (dT/inEC[2])/(1+dT*inEC[3]/2/inEC[2]);
// if (n==0)
// cerr << pos[0] << " " << pos[1] << " " << pos[2] << " " << inEC[1] << endl;
}
}
}
}
ApplyBC();
return true;
}
/************************************************ Operator_Ext_PML_SF_Plane **************************************************************************/
Operator_Ext_PML_SF_Plane::Operator_Ext_PML_SF_Plane(Operator* op) : Operator_Ext_PML_SF(op)
{
}
Operator_Ext_PML_SF_Plane::~Operator_Ext_PML_SF_Plane()
{
}
void Operator_Ext_PML_SF_Plane::SetDirection(int ny, bool top_ny)
{
if ((ny<0) || (ny>2))
return;
m_ny = ny;
m_nyP = (ny+1)%3;
m_nyPP = (ny+2)%3;
m_top = top_ny;
m_numLines[m_ny] = 8; //default width of the pml plane
m_numLines[m_nyP] = m_Op->GetNumberOfLines(m_nyP);
m_numLines[m_nyPP] = m_Op->GetNumberOfLines(m_nyPP);
unsigned int pos[] = {0,0,0};
m_LineNr = (unsigned int)((int)m_top * (int)(m_Op->GetNumberOfLines(m_ny)-1));
pos[m_ny] = m_LineNr;
m_pml_delta = m_Op->GetEdgeLength(m_ny,pos);
}
void Operator_Ext_PML_SF_Plane::SetPMLLength(int width)
{
if (m_ny<0)
{
cerr << "Operator_Ext_PML_SF_Plane::SetPMLLength: Warning, Direction not set! Use SetDirection first!!" << endl;
return;
}
if (width<4)
{
cerr << "Operator_Ext_PML_SF_Plane::SetPMLLength: Warning: A pml width smaller than 4 lines is not allowed, skipping..." << endl;
return;
}
if (width>50)
{
cerr << "Operator_Ext_PML_SF_Plane::SetPMLLength: Warning: A pml width greater than 20 lines is not allowed, skipping..." << endl;
return;
}
m_SetupDone = true;
m_numLines[m_ny] = width;
m_pml_width = (width - 1.5) * m_pml_delta;
}
double Operator_Ext_PML_SF_Plane::GetEdgeArea(int ny, unsigned int pos[3], bool dualMesh) const
{
unsigned int l_pos[] = {pos[0],pos[1],pos[2]};
l_pos[m_ny] = m_LineNr;
return m_Op->GetEdgeArea(ny,l_pos,dualMesh);
}
double Operator_Ext_PML_SF_Plane::GetEdgeLength(int ny, unsigned int pos[3], bool dualMesh) const
{
if (ny==m_ny)
return m_pml_delta;
unsigned int l_pos[] = {pos[0],pos[1],pos[2]};
l_pos[m_ny] = m_LineNr;
return m_Op->GetEdgeLength(ny,l_pos,dualMesh);
}
double Operator_Ext_PML_SF_Plane::GetKappaGraded(double depth, double Zm) const
{
if (depth<0)
return 0.0;
double vars[5] = {depth, m_pml_delta, m_pml_width, Zm, m_numLines[m_ny]};
return m_GradingFunction->Eval(vars);
}
bool Operator_Ext_PML_SF_Plane::Calc_ECPos(int nP, int n, unsigned int* pos, double* inEC) const
{
unsigned int l_pos[] = {pos[0],pos[1],pos[2]};
l_pos[m_ny] = m_LineNr;
double inMat[4];
m_Op->Calc_EffMatPos(n,l_pos,inMat);
double Zm2 = inMat[2] / inMat[0]; // Zm^2 = mue/eps
double Zm = sqrt(Zm2); // Zm = sqrt(Zm^2) = sqrt(mue/eps)
double kappa = 0;
double sigma = 0;
double depth = 0;
if ( (n + nP + 1)%3 == m_ny )
{
if (m_top)
{
depth = pos[m_ny]*m_pml_delta - 0.5*m_pml_delta;
kappa = GetKappaGraded(depth, Zm);
sigma = GetKappaGraded(depth + 0.5*m_pml_delta, Zm) * Zm2;
}
else
{
depth = m_pml_width - (pos[m_ny])*m_pml_delta;
kappa = GetKappaGraded(depth, Zm) ;
sigma = GetKappaGraded(depth-0.5*m_pml_delta, Zm) * Zm2;
}
if ((inMat[0]<=0) || (inMat[2]<=0)) //check if material properties are valid (necessary for cylindrical coords)
{
kappa = sigma = 0;
}
}
double geomFactor = GetEdgeArea(n,pos) / GetEdgeLength(n,pos);
if (geomFactor<=0 || isnan(geomFactor) || isinf(geomFactor)) //check if geomFactor is positive, not zero and a valid number (necessary for cylindrical coords)
geomFactor = 0;
inEC[0] = inMat[0] * geomFactor;
inEC[1] = (inMat[1]+kappa) * geomFactor;
geomFactor = GetEdgeArea(n,pos,true) / GetEdgeLength(n,pos,true);
if (geomFactor<=0 || isnan(geomFactor) || isinf(geomFactor)) //check if geomFactor is positive, not zero and a valid number (necessary for cylindrical coords)
geomFactor = 0;
inEC[2] = inMat[2] * geomFactor;
inEC[3] = (inMat[3]+sigma) * geomFactor;
return true;
}
void Operator_Ext_PML_SF_Plane::ApplyBC()
{
bool PEC[6] = {1,1,1,1,1,1};
bool PMC[6] = {0,0,0,0,0,0};
if (m_top==false)
PEC[2*m_ny+1] = 0;
for (int n=0; n<6; ++n)
{
PMC[n] = (m_BC[n] == 1);
if (n/2 == m_ny)
PMC[n] = false;
}
//apply BC
unsigned int pos[3] = {0,0,0};
for (int n=0; n<3; ++n)
{
int nP = (n+1)%3;
int nPP = (n+2)%3;
for (pos[nP]=0; pos[nP]<m_numLines[nP]; ++pos[nP])
{
for (pos[nPP]=0; pos[nPP]<m_numLines[nPP]; ++pos[nPP])
{
for (int m=0; m<2; ++m)
{
pos[n]=0;
GetVV(m,nP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PEC[2*n];
GetVI(m,nP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PEC[2*n];
GetVV(m,nPP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PEC[2*n];
GetVI(m,nPP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PEC[2*n];
GetII(m,n,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n];
GetIV(m,n,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n];
GetII(m,nP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n];
GetIV(m,nP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n];
GetII(m,nPP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n];
GetIV(m,nPP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n];
pos[n]=m_numLines[n]-1;
GetVV(m,n,pos[0],pos[1],pos[2]) = 0; // these are outside the FDTD-domain as defined by the main disc
GetVI(m,n,pos[0],pos[1],pos[2]) = 0; // these are outside the FDTD-domain as defined by the main disc
GetVV(m,nP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PEC[2*n+1];
GetVI(m,nP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PEC[2*n+1];
GetVV(m,nPP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PEC[2*n+1];
GetVI(m,nPP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PEC[2*n+1];
pos[n]=m_numLines[n]-2;
GetII(m,nP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n+1];
GetIV(m,nP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n+1];
GetII(m,nPP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n+1];
GetIV(m,nPP,pos[0],pos[1],pos[2]) *= (FDTD_FLOAT)!PMC[2*n+1];
}
}
}
}
}
Engine_Extension* Operator_Ext_PML_SF_Plane::CreateEngineExtention()
{
Engine_Ext_PML_SF_Plane* eng_ext = new Engine_Ext_PML_SF_Plane(this);
return eng_ext;
}
bool Operator_Ext_PML_SF_Plane::IsCylinderCoordsSave() const
{
if (m_ny==2)
{
Operator_Cylinder* op_cyl = dynamic_cast<Operator_Cylinder*>(m_Op);
if (op_cyl==NULL)
{
cerr << "Operator_Ext_PML_SF_Plane::IsCylinderCoordsSave(): Error!!! Sanity check failed!!! ==> Developer is not sane.... this should never have happend.. exit..." << endl;
exit(0);
}
if (op_cyl->GetClosedAlpha())
{
cerr << "Operator_Ext_PML_SF_Plane::IsCylinderCoordsSave(): Warning... this extension can not handle a closed alpha cylinder operator... " << endl;
return false;
}
return true;
}
return false;
}
void Operator_Ext_PML_SF_Plane::ShowStat(ostream &ostr) const
{
Operator_Extension::ShowStat(ostr);
string XYZ[3] = {"x","y","z"};
string top_bot[2] = {"bottom", "top"};
ostr << " Active direction\t: " << XYZ[m_ny] << " (" << top_bot[m_top] << ")" << endl;
ostr << " PML width (cells)\t: " << m_numLines[m_ny] << endl;
ostr << " Grading function\t: \"" << m_GradFunc << "\"" << endl;
}
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