From f15c04cd43409a6b37805bd8c1345431f7369a63 Mon Sep 17 00:00:00 2001
From: FLE_Knight <ujwalkishore.jinaga@mail.polimi.it>
Date: Wed, 27 Apr 2022 14:21:30 +0200
Subject: [PATCH] April27
---
.../materialLaw/mlawHyperelastic.cpp | 50 ++++++++-----------
.../materialLaw/mlawHyperelastic.h | 11 ++--
.../mlawNonLocalDamageHyperelastic.cpp | 6 +--
dG3D/src/dG3DIPVariable.cpp | 4 +-
dG3D/src/dG3DIPVariable.h | 5 +-
dG3D/src/dG3DMaterialLaw.cpp | 12 ++---
dG3D/src/dG3DMaterialLaw.h | 4 +-
7 files changed, 42 insertions(+), 50 deletions(-)
diff --git a/NonLinearSolver/materialLaw/mlawHyperelastic.cpp b/NonLinearSolver/materialLaw/mlawHyperelastic.cpp
index df3c8ed49..a33770601 100644
--- a/NonLinearSolver/materialLaw/mlawHyperelastic.cpp
+++ b/NonLinearSolver/materialLaw/mlawHyperelastic.cpp
@@ -314,7 +314,7 @@ mlawHyperViscoElastic::mlawHyperViscoElastic(const mlawHyperViscoElastic& src):
_I4(src._I4), _I(src._I), _Idev(src._Idev)
{
- _temFunc_mu = NULL; // shear modulus;
+/* _temFunc_mu = NULL; // shear modulus;
if (src._temFunc_mu!=NULL){
_temFunc_mu = src._temFunc_mu->clone();
}
@@ -329,7 +329,7 @@ mlawHyperViscoElastic::mlawHyperViscoElastic(const mlawHyperViscoElastic& src):
for(int i=0;i<_N;i++){
if (src._temFunc_Gi[i]!=NULL)
_temFunc_Gi[i] = src._temFunc_Gi[i]->clone();
- }
+ }*/
};
@@ -839,8 +839,7 @@ void mlawPowerYieldHyper::tangent_full_perturbation(
const STensor3 &P,
const STensor3 &F,
const IPHyperViscoElastoPlastic* q0,
- IPHyperViscoElastoPlastic* q1,
- const double Tc
+ IPHyperViscoElastoPlastic* q1
) const{
static STensor43 tmpSTensor43;
@@ -851,7 +850,7 @@ void mlawPowerYieldHyper::tangent_full_perturbation(
for (int j=0; j<3; j++){
Fplus = F;
Fplus(i,j)+=_perturbationfactor;
- this->predictorCorrector(Fplus,q0,&q11,Pplus,false,tmpSTensor43,tmpSTensor43,tmpSTensor43,NULL, Tc);
+ this->predictorCorrector(Fplus,q0,&q11,Pplus,false,tmpSTensor43,tmpSTensor43,tmpSTensor43,NULL);
q1->_DgammaDF(i,j) = (q11._epspbarre - q1->_epspbarre)/_perturbationfactor;
q1->_DirreversibleEnergyDF(i,j) = (q11._irreversibleEnergy - q1->_irreversibleEnergy)/_perturbationfactor;
for (int k=0; k<3; k++){
@@ -882,23 +881,18 @@ void mlawPowerYieldHyper::constitutive(
const bool dTangent,
STensor63* dCalgdeps) const{
-//FLE
- // double Tc =_Tref;
- double Tc = 298.;
-//FLE
-
const IPHyperViscoElastoPlastic *q0=dynamic_cast<const IPHyperViscoElastoPlastic *>(q0i);
IPHyperViscoElastoPlastic *q1 = dynamic_cast<IPHyperViscoElastoPlastic *>(q1i);
static STensor43 dFedF, dFpdF;
if (_tangentByPerturbation){
- this->predictorCorrector(Fn,q0,q1,P,false,Tangent,dFedF,dFpdF,elasticTangent,Tc);
+ this->predictorCorrector(Fn,q0,q1,P,false,Tangent,dFedF,dFpdF,elasticTangent);
if (stiff)
- this->tangent_full_perturbation(Tangent,dFedF,dFpdF,P,Fn,q0,q1,Tc);
+ this->tangent_full_perturbation(Tangent,dFedF,dFpdF,P,Fn,q0,q1);
}
else{
- this->predictorCorrector(Fn,q0,q1,P,stiff,Tangent,dFedF,dFpdF,elasticTangent,Tc);
+ this->predictorCorrector(Fn,q0,q1,P,stiff,Tangent,dFedF,dFpdF,elasticTangent);
}
};
@@ -950,7 +944,7 @@ void mlawPowerYieldHyper::getYieldCoefficientDerivatives(const IPHyperViscoElast
};
void mlawPowerYieldHyper::predictorCorrector_nonAssociatedFlow(const STensor3& F, const IPHyperViscoElastoPlastic *q0, IPHyperViscoElastoPlastic *q1,
- STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF, const double Tc) const{
+ STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF) const{
/* compute elastic predictor */
STensor3& Fp1 = q1->_Fp;
const STensor3& Fp0 = q0->_Fp;
@@ -985,7 +979,7 @@ void mlawPowerYieldHyper::predictorCorrector_nonAssociatedFlow(const STensor3& F
// update A, B
double Ge, Ke;
- viscoElasticPredictor(Ee,q0->_Ee,q0,q1,Ke,Ge,Tc); // This should update the moduli values to the current temperature right?
+ viscoElasticPredictor(Ee,q0->_Ee,q0,q1,Ke,Ge); // This should update the moduli values to the current temperature right?
static STensor3 PhiPr;
PhiPr = q1->_kirchhoff;
@@ -1149,7 +1143,7 @@ void mlawPowerYieldHyper::predictorCorrector_nonAssociatedFlow(const STensor3& F
STensorOperation::logSTensor3(Ce,_order,Ee,&DlnDCe,&DDlnDDCe);
Ee *= 0.5;
// update A, B
- updateViscoElasticFlow(q0,q1,Ke,Ge,Tc); // This wont cause a problem because the moduli are reinitiated inside the function.
+ updateViscoElasticFlow(q0,q1,Ke,Ge); // This wont cause a problem because the moduli are reinitiated inside the function.
// backstress
static STensor3 DB; // increment
@@ -1503,7 +1497,7 @@ void mlawPowerYieldHyper::dPlasticEnergydF(const STensor3 &N, double Gamma, doub
}
void mlawPowerYieldHyper::predictorCorrector_associatedFlow(const STensor3& F, const IPHyperViscoElastoPlastic *q0, IPHyperViscoElastoPlastic *q1,
- STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF, const double Tc) const{
+ STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF) const{
/* compute elastic predictor */
STensor3& Fp1 = q1->_Fp;
const STensor3& Fp0 = q0->_Fp;
@@ -1537,7 +1531,7 @@ void mlawPowerYieldHyper::predictorCorrector_associatedFlow(const STensor3& F, c
// update A, B
double Ge, Ke;
- viscoElasticPredictor(Ee,q0->_Ee,q0,q1,Ke,Ge,Tc); //Moduli being updated here.
+ viscoElasticPredictor(Ee,q0->_Ee,q0,q1,Ke,Ge); //Moduli being updated here.
static STensor3 devKpr; // dev corotational kirchoff stress predictor
static double ppr; // pressure predictor
@@ -1710,7 +1704,7 @@ void mlawPowerYieldHyper::predictorCorrector_associatedFlow(const STensor3& F, c
STensorOperation::logSTensor3(Ce,_order,Ee,&DlnDCe,&DDlnDDCe);
Ee *= 0.5;
- updateViscoElasticFlow(q0,q1,Ke,Ge,Tc); // Moduli being updated here.
+ updateViscoElasticFlow(q0,q1,Ke,Ge); // Moduli being updated here.
}
else{
q1->getRefToDissipationActive() = false;
@@ -2040,27 +2034,27 @@ void mlawPowerYieldHyper::predictorCorrector_associatedFlow(const STensor3& F, c
void mlawPowerYieldHyper::predictorCorrector(const STensor3& F, const IPHyperViscoElastoPlastic *q0, IPHyperViscoElastoPlastic *q1,
STensor3&P, const bool stiff, STensor43& Tangent,STensor43& dFedF, STensor43& dFpdF,
- STensor43* elasticTangent, const double Tc) const{
+ STensor43* elasticTangent) const{
if (_tangentByPerturbation){
if (_nonAssociatedFlow){
- this->predictorCorrector_nonAssociatedFlow(F,q0,q1,P,false,Tangent,dFedF,dFpdF,Tc);
+ this->predictorCorrector_nonAssociatedFlow(F,q0,q1,P,false,Tangent,dFedF,dFpdF);
}
else{
- this->predictorCorrector_associatedFlow(F,q0,q1,P,false,Tangent,dFedF,dFpdF,Tc);
+ this->predictorCorrector_associatedFlow(F,q0,q1,P,false,Tangent,dFedF,dFpdF);
}
if (stiff){
- tangent_full_perturbation(Tangent,dFedF,dFpdF,P,F,q0,q1,Tc);
+ tangent_full_perturbation(Tangent,dFedF,dFpdF,P,F,q0,q1);
}
}
else{
if (_nonAssociatedFlow){
- this->predictorCorrector_nonAssociatedFlow(F,q0,q1,P,stiff,Tangent,dFedF,dFpdF,Tc);
+ this->predictorCorrector_nonAssociatedFlow(F,q0,q1,P,stiff,Tangent,dFedF,dFpdF);
}
else{
- this->predictorCorrector_associatedFlow(F,q0,q1,P,stiff,Tangent,dFedF,dFpdF,Tc);
+ this->predictorCorrector_associatedFlow(F,q0,q1,P,stiff,Tangent,dFedF,dFpdF);
}
}
// compute mechanical tengent
@@ -2070,7 +2064,7 @@ void mlawPowerYieldHyper::predictorCorrector(const STensor3& F, const IPHyperVis
static IPHyperViscoElastoPlastic q1tmp(*q1);
q1tmp.operator=(*(dynamic_cast<const IPVariable*> (q1)));
mlawHyperViscoElastic::predictorCorrector_ViscoElastic(q0->getConstRefToFe(), q1->getConstRefToFe(), Ptmp, q0, &q1tmp,
- true, *elasticTangent, Tc);
+ true, *elasticTangent);
}
};
@@ -2193,8 +2187,8 @@ void mlawPowerYieldHyperWithFailure::checkInternalState(IPVariable* ipv, const I
void mlawPowerYieldHyperWithFailure::predictorCorrector(const STensor3& F, const IPHyperViscoElastoPlastic *q0, IPHyperViscoElastoPlastic *q1,
STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF,
- STensor43* elasticTangent, const double Tc) const{
- mlawPowerYieldHyper::predictorCorrector(F,q0,q1,P,stiff,Tangent,dFedF,dFpdF, elasticTangent,Tc);
+ STensor43* elasticTangent) const{
+ mlawPowerYieldHyper::predictorCorrector(F,q0,q1,P,stiff,Tangent,dFedF,dFpdF, elasticTangent);
// compute failure r and DrDF
double& gF = q1->getRefToFailurePlasticity();
diff --git a/NonLinearSolver/materialLaw/mlawHyperelastic.h b/NonLinearSolver/materialLaw/mlawHyperelastic.h
index d2b482280..3876ee4c2 100644
--- a/NonLinearSolver/materialLaw/mlawHyperelastic.h
+++ b/NonLinearSolver/materialLaw/mlawHyperelastic.h
@@ -279,16 +279,16 @@ class mlawPowerYieldHyper : public mlawHyperViscoElastic{
const STensor43 &DdevNDCepr, const STensor3 &DtrNDCepr, const STensor3 &KS, const STensor43 &CeprToF, STensor3 &dPlasticEnergydF) const;
virtual void predictorCorrector_nonAssociatedFlow(const STensor3& F, const IPHyperViscoElastoPlastic *q0_, IPHyperViscoElastoPlastic *q1,
- STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF, const double Tc) const;
+ STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF) const;
virtual void predictorCorrector_associatedFlow(const STensor3& F, const IPHyperViscoElastoPlastic *q0_, IPHyperViscoElastoPlastic *q1,
- STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF, const double Tc) const;
+ STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF) const;
protected:
virtual void predictorCorrector(const STensor3& F, const IPHyperViscoElastoPlastic *q0_, IPHyperViscoElastoPlastic *q1,
STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF,
- STensor43* elasticTangent, const double Tc) const;
+ STensor43* elasticTangent) const;
virtual void tangent_full_perturbation( // compute tangent by perturbation
STensor43 &T, // current tangent
STensor43& dFedF,
@@ -296,8 +296,7 @@ class mlawPowerYieldHyper : public mlawHyperViscoElastic{
const STensor3 &P, // current PK stress
const STensor3 &F, // current deformation gradient
const IPHyperViscoElastoPlastic* q0, // previous internal variables
- IPHyperViscoElastoPlastic* q1, // current internal variables
- const double Tc
+ IPHyperViscoElastoPlastic* q1
) const;
#endif // SWIG
@@ -355,7 +354,7 @@ class mlawPowerYieldHyperWithFailure : public mlawPowerYieldHyper{
protected:
virtual void predictorCorrector(const STensor3& F, const IPHyperViscoElastoPlastic *q0_, IPHyperViscoElastoPlastic *q1,
STensor3&P, const bool stiff, STensor43& Tangent, STensor43& dFedF, STensor43& dFpdF,
- STensor43* elasticTangent, const double Tc) const;
+ STensor43* elasticTangent) const;
#endif // SWIG
public:
mlawPowerYieldHyperWithFailure(const int num,const double E,const double nu, const double rho,
diff --git a/NonLinearSolver/materialLaw/mlawNonLocalDamageHyperelastic.cpp b/NonLinearSolver/materialLaw/mlawNonLocalDamageHyperelastic.cpp
index 9a94d0a96..0ca5f6a90 100644
--- a/NonLinearSolver/materialLaw/mlawNonLocalDamageHyperelastic.cpp
+++ b/NonLinearSolver/materialLaw/mlawNonLocalDamageHyperelastic.cpp
@@ -135,7 +135,7 @@ void mlawNonLocalDamagePowerYieldHyper::constitutive(
static STensor43 dFedF, dFpdF;
static STensor3 Peff;
- mlawPowerYieldHyper::predictorCorrector(Fn,ipvprev,ipvcur,Peff,stiff,Tangent,dFedF,dFpdF,elasticTangent,Tc);
+ mlawPowerYieldHyper::predictorCorrector(Fn,ipvprev,ipvcur,Peff,stiff,Tangent,dFedF,dFpdF,elasticTangent);
const STensor3& Fe = ipvcur->_Fe;
const STensor3& dgammadF = ipvcur->_DgammaDF;
@@ -324,7 +324,7 @@ void mlawLocalDamagePowerYieldHyperWithFailure::constitutive(
double Tc = _Tref;
static STensor43 dFedF, dFpdF;
static STensor3 Peff;
- mlawPowerYieldHyperWithFailure::predictorCorrector(Fn,ipvprev,ipvcur,Peff,stiff,Tangent,dFedF,dFpdF,NULL,Tc);
+ mlawPowerYieldHyperWithFailure::predictorCorrector(Fn,ipvprev,ipvcur,Peff,stiff,Tangent,dFedF,dFpdF,NULL);
// get result from effective law
const STensor3& Fe = ipvcur->_Fe;
@@ -621,7 +621,7 @@ void mlawNonLocalDamagePowerYieldHyperWithFailure::predictorCorrector(
// FLE
double Tc = _Tref;
- mlawPowerYieldHyperWithFailure::predictorCorrector(Fn,ipvprev,ipvcur,Peff,stiff,Tangent,dFedF,dFpdF, elasticTangent,Tc);
+ mlawPowerYieldHyperWithFailure::predictorCorrector(Fn,ipvprev,ipvcur,Peff,stiff,Tangent,dFedF,dFpdF, elasticTangent);
// get result from effective law
const STensor3& Fe = ipvcur->_Fe;
diff --git a/dG3D/src/dG3DIPVariable.cpp b/dG3D/src/dG3DIPVariable.cpp
index 9a65fbb63..a31a273b0 100644
--- a/dG3D/src/dG3DIPVariable.cpp
+++ b/dG3D/src/dG3DIPVariable.cpp
@@ -4133,8 +4133,8 @@ NonLinearTVMDG3DIPVariable::NonLinearTVMDG3DIPVariable(const mlawNonLinearTVM& v
_ipViscoElastic = new IPNonLinearTVM(viscoLaw.getViscoElasticNumberOfElement());
};
*/
-NonLinearTVMDG3DIPVariable::NonLinearTVMDG3DIPVariable(const mlawNonLinearTVM& viscoLaw, double Tinitial, const bool oninter) :
- ThermoMechanicsDG3DIPVariableBase(oninter){
+NonLinearTVMDG3DIPVariable::NonLinearTVMDG3DIPVariable(const mlawNonLinearTVM& viscoLaw, double Tinitial, const bool createBodyForceHO, const bool oninter) :
+ ThermoMechanicsDG3DIPVariableBase(createBodyForceHO, oninter){
_ipViscoElastic = new IPNonLinearTVM(viscoLaw.getViscoElasticNumberOfElement());
this->getRefToTemperature()=Tinitial;
};
diff --git a/dG3D/src/dG3DIPVariable.h b/dG3D/src/dG3DIPVariable.h
index 65f58ade1..58274723b 100644
--- a/dG3D/src/dG3DIPVariable.h
+++ b/dG3D/src/dG3DIPVariable.h
@@ -4753,13 +4753,12 @@ class NonLinearTVMDG3DIPVariable : public ThermoMechanicsDG3DIPVariableBase{ /
protected:
IPNonLinearTVM * _ipViscoElastic;
- NonLinearTVMDG3DIPVariable(const bool oninter=false) {Msg::Error("NonLinearTVMDG3DIPVariable: Cannot use the default constructor of ThermoMechanicsDG3DIPVariableBase");}
+ NonLinearTVMDG3DIPVariable(const bool createBodyForceHO, const bool oninter):ThermoMechanicsDG3DIPVariableBase(createBodyForceHO, oninter) {Msg::Error("NonLinearTVMDG3DIPVariable: Cannot use the default constructor of ThermoMechanicsDG3DIPVariableBase");}
public:
// Constructor Changed
// NonLinearTVMDG3DIPVariable(const mlawNonLinearTVM& viscoLaw, const bool oninter=false, int nbExtraDof=0); // ?? - WHAT to add/change?
- NonLinearTVMDG3DIPVariable(const mlawNonLinearTVM& viscoLaw, double Tinitial, const bool oninter=false); // Changed
-
+ NonLinearTVMDG3DIPVariable(const mlawNonLinearTVM& viscoLaw, double Tinitial, const bool createBodyForceHO, const bool oninter); // Changed
NonLinearTVMDG3DIPVariable(const NonLinearTVMDG3DIPVariable& src);
virtual NonLinearTVMDG3DIPVariable& operator = (const IPVariable& src);
virtual ~NonLinearTVMDG3DIPVariable();
diff --git a/dG3D/src/dG3DMaterialLaw.cpp b/dG3D/src/dG3DMaterialLaw.cpp
index 4b1ae0d27..7cdf57ca0 100644
--- a/dG3D/src/dG3DMaterialLaw.cpp
+++ b/dG3D/src/dG3DMaterialLaw.cpp
@@ -7423,20 +7423,20 @@ void NonLinearTVMDG3DMaterialLaw::setTemperatureFunction_BranchThermalDilationCo
};
// Added extra argument in the NonLinearTVMDG3DIPVariable contructor - Tinitial (added from LinearThermoMech)
-void NonLinearTVMDG3DMaterialLaw::createIPState(IPStateBase* &ips,const bool* state_,const MElement *ele, const int nbFF_, const IntPt *GP, const int gpt) const
+void NonLinearTVMDG3DMaterialLaw::createIPState(IPStateBase* &ips, bool hasBodyForce, const bool* state_,const MElement *ele, const int nbFF_, const IntPt *GP, const int gpt) const
{
// check interface element
bool inter=true;
const MInterfaceElement *iele = dynamic_cast<const MInterfaceElement*>(ele);
if(iele==NULL) inter=false;
- IPVariable* ipvi = new NonLinearTVMDG3DIPVariable(_viscoLaw,_viscoLaw.getInitialTemperature(),inter); // Why 3 times? --- WHAT?? Add getInitialTemperature in Material Law
- IPVariable* ipv1 = new NonLinearTVMDG3DIPVariable(_viscoLaw,_viscoLaw.getInitialTemperature(),inter);
- IPVariable* ipv2 = new NonLinearTVMDG3DIPVariable(_viscoLaw,_viscoLaw.getInitialTemperature(),inter);
+ IPVariable* ipvi = new NonLinearTVMDG3DIPVariable(_viscoLaw,_viscoLaw.getInitialTemperature(),hasBodyForce,inter); // Why 3 times? --- WHAT?? Add getInitialTemperature in Material Law
+ IPVariable* ipv1 = new NonLinearTVMDG3DIPVariable(_viscoLaw,_viscoLaw.getInitialTemperature(),hasBodyForce,inter);
+ IPVariable* ipv2 = new NonLinearTVMDG3DIPVariable(_viscoLaw,_viscoLaw.getInitialTemperature(),hasBodyForce,inter);
if(ips != NULL) delete ips;
ips = new IP3State(state_,ipvi,ipv1,ipv2);
}
-void NonLinearTVMDG3DMaterialLaw::createIPVariable(IPVariable* &ipv,const MElement *ele, const int nbFF_, const IntPt *GP, const int gpt) const
+void NonLinearTVMDG3DMaterialLaw::createIPVariable(IPVariable* &ipv, bool hasBodyForce, const MElement *ele, const int nbFF_, const IntPt *GP, const int gpt) const
{
if(ipv !=NULL) delete ipv;
bool inter=true;
@@ -7444,7 +7444,7 @@ void NonLinearTVMDG3DMaterialLaw::createIPVariable(IPVariable* &ipv,const MEleme
if(iele == NULL){
inter=false;
}
- ipv = new NonLinearTVMDG3DIPVariable(_viscoLaw,_viscoLaw.getInitialTemperature(),inter);
+ ipv = new NonLinearTVMDG3DIPVariable(_viscoLaw,_viscoLaw.getInitialTemperature(),hasBodyForce,inter);
}
// 2 Member Functions added from LinearThermoMechanicsDG3DMaterialLaw -- Add these functions in the material law
diff --git a/dG3D/src/dG3DMaterialLaw.h b/dG3D/src/dG3DMaterialLaw.h
index 0f2bfd394..f62764b42 100644
--- a/dG3D/src/dG3DMaterialLaw.h
+++ b/dG3D/src/dG3DMaterialLaw.h
@@ -2580,8 +2580,8 @@ class NonLinearTVMDG3DMaterialLaw : public dG3DMaterialLaw{ // public Material
_viscoLaw.setTime(t,dtime);
}
virtual materialLaw::matname getType() const {return _viscoLaw.getType();}
- virtual void createIPState(IPStateBase* &ips,const bool* state_=NULL,const MElement *ele=NULL, const int nbFF_=0, const IntPt *GP=NULL, const int gpt = 0) const;
- virtual void createIPVariable(IPVariable* &ipv,const MElement *ele, const int nbFF_, const IntPt *GP, const int gpt) const;
+ virtual void createIPState(IPStateBase* &ips, bool hasBodyForce, const bool* state_=NULL,const MElement *ele=NULL, const int nbFF_=0, const IntPt *GP=NULL, const int gpt = 0) const;
+ virtual void createIPVariable(IPVariable* &ipv, bool hasBodyForce, const MElement *ele, const int nbFF_, const IntPt *GP, const int gpt) const;
virtual void initLaws(const std::map<int,materialLaw*> &maplaw){}
virtual double soundSpeed() const{return _viscoLaw.soundSpeed();} // or change value ??
virtual void stress(IPVariable*ipv, const IPVariable*ipvprev, const bool stiff=true, const bool checkfrac=true, const bool dTangent=false);
--
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