ISAT.H

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License
    This file is part of OpenFOAM.
 
    OpenFOAM 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.
 
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    You should have received a copy of the GNU General Public License
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Class
    Foam::chemistryTabulationMethods::ISAT
 
Description
    Implementation of the ISAT (In-situ adaptive tabulation), for chemistry
    calculation.
 
    Reference:
    \verbatim
        Pope, S. B. (1997).
        Computationally efficient implementation of combustion chemistry using
        in situ adaptive tabulation.
        Combustion Theory and Modelling, 1, 41-63.
    \endverbatim
 
\*---------------------------------------------------------------------------*/
 
#ifndef ISAT_H
#define ISAT_H
 
#include "chemistryTabulationMethod.H"
#include "binaryTree.H"
#include "volFields.H"
#include "OFstream.H"
#include "cpuTime.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace chemistryTabulationMethods
{
 
/*---------------------------------------------------------------------------*\
                            Class ISAT Declaration
\*---------------------------------------------------------------------------*/
 
class ISAT
:
    public chemistryTabulationMethod
{
    // Private Data
 
        const dictionary coeffsDict_;
 
        const odeChemistryModel& chemistry_;
 
        //- Switch to select performance logging
        Switch log_;
 
        //- Is reduction applied to the state vectors
        const bool reduction_;
 
        //- List of the stored 'points' organised in a binary tree
        binaryTree chemisTree_;
 
        //- List of scale factors for species, temperature and pressure
        scalarField scaleFactor_;
 
        const Time& runTime_;
 
        label timeSteps_;
 
        //- Lifetime (number of time steps) of a stored point
        label chPMaxLifeTime_;
 
        //- Maximum number of growths before removing from the tree
        label maxGrowth_;
 
        //- Check the binary tree for leafs to remove every interval
        label checkEntireTreeInterval_;
 
        //- Factor that multiply the ideal depth of a binary tree to decide
        // whether to try to balance of not
        scalar maxDepthFactor_;
 
        //- Minimal size before trying to balance the tree
        label minBalanceThreshold_;
 
        //- After a failed primary retrieve, look in the MRU list
        Switch MRURetrieve_;
 
        //- Most Recently Used (MRU) list of chemPoint
        SLList<chemPointISAT*> MRUList_;
 
        //- Maximum size of the MRU list
        label maxMRUSize_;
 
        //- Store a pointer to the last chemPointISAT found
        chemPointISAT* lastSearch_;
 
        //- Switch to allow growth (on by default)
        Switch growPoints_;
 
        scalar tolerance_;
 
        // Statistics on ISAT usage
        label nRetrieved_;
        label nGrowth_;
        label nAdd_;
        scalar addNewLeafCpuTime_;
        scalar growCpuTime_;
        scalar searchISATCpuTime_;
 
        cpuTime cpuTime_;
 
        autoPtr<OFstream> nRetrievedFile_;
        autoPtr<OFstream> nGrowthFile_;
        autoPtr<OFstream> nAddFile_;
        autoPtr<OFstream> sizeFile_;
 
        //- Log file for the average time spent adding tabulated data
        autoPtr<OFstream> cpuAddFile_;
 
        //- Log file for the average time spent growing tabulated data
        autoPtr<OFstream> cpuGrowFile_;
 
        //- Log file for the average time spent retrieving tabulated data
        autoPtr<OFstream> cpuRetrieveFile_;
 
        // Field containing information about tabulation:
        // 0 -> add (direct integration)
        // 1 -> grow
        // 2 -> retrieve
        volScalarField::Internal tabulationResults_;
 
        bool cleaningRequired_;
 
 
    // Private Member Functions
 
        //- Add a chemPoint to the MRU list
        void addToMRU(chemPointISAT* phi0);
 
        //- Compute and return the mapping of the composition phiq
        //  Input : phi0 the nearest chemPoint used in the linear interpolation
        //  phiq the composition of the query point for which we want to
        //  compute the mapping
        //  Rphiq the mapping of the new composition point (given as empty)
        //  Output: void (the mapping is stored in the Rphiq array)
        //  Rphiq = Rphi0 + A * (phiq-phi0)
        void calcNewC
        (
            chemPointISAT* phi0,
            const scalarField& phiq,
            scalarField& Rphiq
        );
 
        //- Check if the composition of the query point phiq lies in the
        //  ellipsoid of accuracy approximating the region of accuracy of the
        //  stored chemPoint phi0
        //  Input : phi0 the nearest chemPoint used in the linear interpolation
        //  phiq the composition of the query point for which we want to
        //  compute the mapping
        //  Output: true if phiq is in the EOA, false if not
        bool grow
        (
            chemPointISAT* phi0,
            const scalarField& phiq,
            const scalarField& Rphiq
        );
 
        //- Clean and balance the tree
        bool cleanAndBalance();
 
        //- Functions to construct the gradients matrix
        //  When mechanism reduction is active, the A matrix is given by
        //        Aaa Aad
        //  A = ( Ada Add ), where the sub gradient matrices are:
        //  (Aaa) active species according to active species, (Aad) active
        //  species according to disabled species, (Ada) disabled species
        //  according to active species, and (Add) disabled species according to
        //  disabled species.
        //  The current implementation computes Aaa with the Jacobian of the
        //  reduced set of species. Aad = 0, Ada = 0, and Add = I.
        //  To be implemented: add options to compute the A matrix for different
        //  strategies
        void computeA
        (
            scalarSquareMatrix& A,
            const scalarField& Rphiq,
            const label li,
            const scalar dt
        );
 
 
public:
 
    //- Runtime type information
    TypeName("ISAT");
 
 
    // Constructors
 
        //- Construct from dictionary
        ISAT
        (
            const dictionary& chemistryProperties,
            const odeChemistryModel& chemistry
        );
 
        //- Disallow default bitwise copy construction
        ISAT(const ISAT&) = delete;
 
 
    // Destructor
    virtual ~ISAT();
 
 
    // Member Functions
 
        //- Return true as this tabulation method tabulates
        virtual bool tabulates()
        {
            return true;
        }
 
        //- Return true if reduction is applied to the state variables
        bool reduction() const
        {
            return reduction_;
        }
 
        const odeChemistryModel& chemistry()
        {
            return chemistry_;
        }
 
        inline binaryTree& chemisTree()
        {
            return chemisTree_;
        }
 
        inline const scalarField& scaleFactor() const
        {
            return scaleFactor_;
        }
 
        //- Return the number of chemistry evaluations
        inline label timeSteps() const
        {
            return timeSteps_;
        }
 
        virtual void writePerformance();
 
        //- Find the closest stored leaf of phiQ and store the result in
        // RphiQ or return false.
        virtual bool retrieve
        (
            const Foam::scalarField& phiq,
            scalarField& Rphiq
        );
 
        //- Add information to the tabulation.
        //  This function can grow an existing point or add a new leaf to the
        //  binary tree Input : phiq the new composition to store Rphiq the
        //  mapping of the new composition point
        virtual label add
        (
            const scalarField& phiq,
            const scalarField& Rphiq,
            const label nActive,
            const label li,
            const scalar deltaT
        );
 
        virtual void reset();
 
        virtual bool update();
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace chemistryTabulationMethods
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //