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Wilson flow with adaptive steps

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This commit is contained in:
Guido Cossu 2017-06-02 16:55:53 +01:00
parent aaf1e33a77
commit 7da4856e8e
1 changed files with 37 additions and 10 deletions
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47
lib/qcd/smearing/WilsonFlow.h
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@ -43,7 +43,7 @@ class WilsonFlow: public Smear<Gimpl>{
mutable WilsonGaugeAction<Gimpl> SG; mutable WilsonGaugeAction<Gimpl> SG;
void evolve_step(typename Gimpl::GaugeField&) const; void evolve_step(typename Gimpl::GaugeField&) const;
void evolve_step_adaptive(typename Gimpl::GaugeField&) const; void evolve_step_adaptive(typename Gimpl::GaugeField&, RealD);
RealD tau(unsigned int t)const {return epsilon*(t+1.0); } RealD tau(unsigned int t)const {return epsilon*(t+1.0); }
public: public:
@ -75,7 +75,9 @@ class WilsonFlow: public Smear<Gimpl>{
// undefined for WilsonFlow // undefined for WilsonFlow
} }
void smear_adaptive(GaugeField&, const GaugeField&, RealD maxTau);
RealD energyDensityPlaquette(unsigned int step, const GaugeField& U) const; RealD energyDensityPlaquette(unsigned int step, const GaugeField& U) const;
RealD energyDensityPlaquette(const GaugeField& U) const;
}; };
@ -102,7 +104,11 @@ void WilsonFlow<Gimpl>::evolve_step(typename Gimpl::GaugeField &U) const{
} }
template <class Gimpl> template <class Gimpl>
void WilsonFlow<Gimpl>::evolve_step_adaptive(typename Gimpl::GaugeField &U) const { void WilsonFlow<Gimpl>::evolve_step_adaptive(typename Gimpl::GaugeField &U, RealD maxTau) {
if (maxTau - taus < epsilon){
epsilon = maxTau-taus;
}
std::cout << GridLogMessage << "Integration epsilon : " << epsilon << std::endl;
GaugeField Z(U._grid); GaugeField Z(U._grid);
GaugeField Zprime(U._grid); GaugeField Zprime(U._grid);
GaugeField tmp(U._grid), Uprime(U._grid); GaugeField tmp(U._grid), Uprime(U._grid);
@ -142,10 +148,14 @@ void WilsonFlow<Gimpl>::evolve_step_adaptive(typename Gimpl::GaugeField &U) cons
template <class Gimpl> template <class Gimpl>
RealD WilsonFlow<Gimpl>::energyDensityPlaquette(unsigned int step, const GaugeField& U) const { RealD WilsonFlow<Gimpl>::energyDensityPlaquette(unsigned int step, const GaugeField& U) const {
RealD td = tau(step); RealD td = tau(step);
//RealD td = tau;
return 2.0 * td * td * SG.S(U)/U._grid->gSites(); return 2.0 * td * td * SG.S(U)/U._grid->gSites();
} }
template <class Gimpl>
RealD WilsonFlow<Gimpl>::energyDensityPlaquette(const GaugeField& U) const {
return 2.0 * taus * taus * SG.S(U)/U._grid->gSites();
}
//#define WF_TIMING //#define WF_TIMING
@ -154,7 +164,6 @@ RealD WilsonFlow<Gimpl>::energyDensityPlaquette(unsigned int step, const GaugeFi
template <class Gimpl> template <class Gimpl>
void WilsonFlow<Gimpl>::smear(GaugeField& out, const GaugeField& in) const { void WilsonFlow<Gimpl>::smear(GaugeField& out, const GaugeField& in) const {
out = in; out = in;
taus = epsilon;
for (unsigned int step = 1; step <= Nstep; step++) { for (unsigned int step = 1; step <= Nstep; step++) {
auto start = std::chrono::high_resolution_clock::now(); auto start = std::chrono::high_resolution_clock::now();
std::cout << GridLogMessage << "Evolution time :"<< tau(step) << std::endl; std::cout << GridLogMessage << "Evolution time :"<< tau(step) << std::endl;
@ -173,14 +182,32 @@ void WilsonFlow<Gimpl>::smear(GaugeField& out, const GaugeField& in) const {
<< WilsonLoops<PeriodicGimplR>::TopologicalCharge(out) << std::endl; << WilsonLoops<PeriodicGimplR>::TopologicalCharge(out) << std::endl;
} }
} }
std::cout << GridLogMessage << "[WilsonFlow] Energy density (plaq) : "
<< step << " "
<< energyDensityPlaquette(Nstep,out) << std::endl;
std::cout << GridLogMessage << "[WilsonFlow] Top. charge : "
<< step << " "
<< WilsonLoops<PeriodicGimplR>::TopologicalCharge(out) << std::endl;
} }
template <class Gimpl>
void WilsonFlow<Gimpl>::smear_adaptive(GaugeField& out, const GaugeField& in, RealD maxTau){
out = in;
taus = epsilon;
unsigned int step = 0;
do{
step++;
std::cout << GridLogMessage << "Evolution time :"<< taus << std::endl;
evolve_step_adaptive(out, maxTau);
std::cout << GridLogMessage << "[WilsonFlow] Energy density (plaq) : "
<< step << " "
<< energyDensityPlaquette(out) << std::endl;
if( step % measure_interval == 0){
std::cout << GridLogMessage << "[WilsonFlow] Top. charge : "
<< step << " "
<< WilsonLoops<PeriodicGimplR>::TopologicalCharge(out) << std::endl;
}
} while (taus < maxTau);
}
} // namespace QCD } // namespace QCD
} // namespace Grid } // namespace Grid