G4DNASmoluchowskiReactionModel Class Reference

#include <G4DNASmoluchowskiReactionModel.hh>

Inheritance diagram for G4DNASmoluchowskiReactionModel:

Public Member Functions
	G4DNASmoluchowskiReactionModel ()
	~G4DNASmoluchowskiReactionModel () override
	G4DNASmoluchowskiReactionModel (const G4DNASmoluchowskiReactionModel &)=delete
G4DNASmoluchowskiReactionModel &	operator= (const G4DNASmoluchowskiReactionModel &)=delete
void	Initialise (const G4MolecularConfiguration *, const G4Track &) override
void	InitialiseToPrint (const G4MolecularConfiguration *) override
G4double	GetReactionRadius (const G4MolecularConfiguration *, const G4MolecularConfiguration *) override
G4double	GetReactionRadius (const G4int &) override
G4bool	FindReaction (const G4Track &, const G4Track &, G4double, G4double &, G4bool) override
Public Member Functions inherited from G4VDNAReactionModel
	G4VDNAReactionModel ()
	G4VDNAReactionModel (const G4VDNAReactionModel &)=delete
G4VDNAReactionModel &	operator= (const G4VDNAReactionModel &)=delete
virtual	~G4VDNAReactionModel ()
void	SetReactionTable (const G4DNAMolecularReactionTable *)
const G4DNAMolecularReactionTable *	GetReactionTable ()

Additional Inherited Members
Protected Attributes inherited from G4VDNAReactionModel
const G4DNAMolecularReactionTable *	fpReactionTable {nullptr}

Detailed Description

G4DNASmoluchowskiReactionModel should be used for very fast reactions (high reaction rate) : the reactions between reactants occuring at encounter. When the time step is constrained this model uses brownian bridge : "Absorbing (Smoluchowski) boundary condition" Reference : On the simulation of diffusion processes close to boundaries, N. J. B. Green, Molecular Physics, 65: 6, 1399 — 1408(1988)

Definition at line 63 of file G4DNASmoluchowskiReactionModel.hh.

Constructor & Destructor Documentation

G4DNASmoluchowskiReactionModel() [1/2]

G4DNASmoluchowskiReactionModel::G4DNASmoluchowskiReactionModel ( )

default

~G4DNASmoluchowskiReactionModel()

G4DNASmoluchowskiReactionModel::~G4DNASmoluchowskiReactionModel ( )

overridedefault

G4DNASmoluchowskiReactionModel() [2/2]

G4DNASmoluchowskiReactionModel::G4DNASmoluchowskiReactionModel ( const G4DNASmoluchowskiReactionModel & )

delete

Member Function Documentation

FindReaction()

G4bool G4DNASmoluchowskiReactionModel::FindReaction ( const G4Track & __trackA, const G4Track & __trackB, G4double __reactionRadius, G4double & __separationDistance, G4bool __alongStepReaction )

overridevirtual

Implements G4VDNAReactionModel.

Definition at line 63 of file G4DNASmoluchowskiReactionModel.cc.

{
    const G4double R2 = __reactionRadius * __reactionRadius;
    G4double postStepSeparation = 0.;
    bool do_break = false;
    int k = 0;
 
    for (; k < 3; ++k)
    {
        postStepSeparation += std::pow(
            __trackA.GetPosition()[k] - __trackB.GetPosition()[k], 2);
 
        if (postStepSeparation > R2)
        {
            do_break = true;
            break;
        }
    }
 
    if (!do_break)
    {
        // The loop was not break
        // => r^2 < R^2
        __separationDistance = std::sqrt(postStepSeparation);
        return true;
    }
    if (__alongStepReaction)
    {
        //Along step check and the loop has break
 
        // Continue loop
        for (; k < 3; ++k)
        {
            postStepSeparation += std::pow(
                __trackA.GetPosition()[k] - __trackB.GetPosition()[k], 2);
        }
        // Use Green approach : the Brownian bridge
        __separationDistance = (postStepSeparation = std::sqrt(postStepSeparation));
 
        auto pMoleculeA = GetMolecule(__trackA);
        auto pMoleculeB = GetMolecule(__trackB);
 
        G4double D = pMoleculeA->GetDiffusionCoefficient()
                     + pMoleculeB->GetDiffusionCoefficient();
 
        const auto& preStepPositionA = __trackA.GetStep()->GetPreStepPoint()->GetPosition();
        const auto& preStepPositionB = __trackB.GetStep()->GetPreStepPoint()->GetPosition();
 
        G4double preStepSeparation = (preStepPositionA - preStepPositionB).mag();
 
        //===================================
        // Brownian bridge
        G4double __probabiltyOfEncounter = G4Exp(-(preStepSeparation - __reactionRadius)
                                                    * (postStepSeparation - __reactionRadius)
                                                 / (D * (__trackB.GetStep()->GetDeltaTime()))
                                            );
        G4double __selectedPOE = G4UniformRand();
 
        if (__selectedPOE <= __probabiltyOfEncounter)
        {
            return true;
        }
        //===================================
    }
 
    return false;
}

GetReactionRadius() [1/2]

G4double G4DNASmoluchowskiReactionModel::GetReactionRadius ( const G4int & __i )

overridevirtual

Implements G4VDNAReactionModel.

Definition at line 57 of file G4DNASmoluchowskiReactionModel.cc.

{
    G4double __output = (*fpReactionData)[__i]->GetEffectiveReactionRadius();
    return __output;
}

GetReactionRadius() [2/2]

G4double G4DNASmoluchowskiReactionModel::GetReactionRadius ( const G4MolecularConfiguration * pMol1, const G4MolecularConfiguration * pMol2 )

overridevirtual

Implements G4VDNAReactionModel.

Definition at line 50 of file G4DNASmoluchowskiReactionModel.cc.

{
    G4double __output = fpReactionTable->GetReactionData(pMol1, pMol2)->GetEffectiveReactionRadius();
    return __output;
}

Initialise()

void G4DNASmoluchowskiReactionModel::Initialise ( const G4MolecularConfiguration * pMolecule, const G4Track &  )

overridevirtual

Reimplemented from G4VDNAReactionModel.

Definition at line 39 of file G4DNASmoluchowskiReactionModel.cc.

{
    fpReactionData = fpReactionTable->GetReactionData(pMolecule);
}

InitialiseToPrint()

void G4DNASmoluchowskiReactionModel::InitialiseToPrint ( const G4MolecularConfiguration * pMolecule )

overridevirtual

Implements G4VDNAReactionModel.

Definition at line 45 of file G4DNASmoluchowskiReactionModel.cc.

{
    fpReactionData = fpReactionTable->GetReactionData(pMolecule);
}

operator=()

G4DNASmoluchowskiReactionModel & G4DNASmoluchowskiReactionModel::operator= ( const G4DNASmoluchowskiReactionModel & )

delete

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The documentation for this class was generated from the following files:

• G4DNASmoluchowskiReactionModel.hh
• G4DNASmoluchowskiReactionModel.cc