Shake.hpp

/*
 * Copyright (c) 2004-present, The University of Notre Dame. All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *
 * [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
 * [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
 * [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
 * [4] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [5] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [6] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [7] Lamichhane, Newman & Gezelter, J. Chem. Phys. 141, 134110 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 */
 
#ifndef CONSTRAINTS_SHAKE_HPP
#define CONSTRAINTS_SHAKE_HPP
 
#include "brains/SimInfo.hpp"
#include "constraints/ConstraintPair.hpp"
#include "io/ConstraintWriter.hpp"
 
namespace OpenMD {
 
  class Shake {
  public:
    enum ConsStatus {
      consFail    = -1,  // Constraint Fail
      consSuccess = 0,   // constrain the pair by moving two elements
      consAlready = 1    // current pair is already constrained, do not need to
                         // move the elements
    };
 
    Shake(SimInfo* info);
    void constraintR();
    void constraintF();
 
    int getMaxConsIteration() { return maxConsIteration_; }
    void setMaxConsIteration(int iteration) { maxConsIteration_ = iteration; }
 
    RealType getConsTolerance() { return consTolerance_; }
    void setConsTolerance(RealType tolerance) { consTolerance_ = tolerance; }
 
  private:
    typedef int (Shake::*ConstraintPairFuncPtr)(ConstraintPair*);
    void doConstraint(ConstraintPairFuncPtr func);
    int constraintPairR(ConstraintPair* consPair);
    int constraintPairF(ConstraintPair* consPair);
 
    SimInfo* info_ {nullptr};
    int maxConsIteration_;
    RealType consTolerance_;
    Snapshot* currentSnapshot_;
    bool doShake_;
    std::string constraintOutputFile_;
    ConstraintWriter* constraintWriter_;
    RealType constraintTime_;
    RealType currConstraintTime_;
  };
}  // namespace OpenMD
 
#endif