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/*
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fix_rhok.h
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A fix to do umbrella sampling on rho(k).
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The usage is as follows:
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fix [name] [groupID] rhoKUmbrella [kx] [ky] [kz] [kappa = spring constant] [rhoK0]
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where k_i = (2 pi / L_i) * n_i
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Written by Ulf Pedersen and Patrick Varilly, 4 Feb 2010
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Tweaked for LAMMPS 15 Jan 2010 version by Ulf Pedersen, 19 Aug 2010
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*/
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#ifdef FIX_CLASS
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FixStyle(rhok,FixRhok)
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#else
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#ifndef __FIX_RHOK__
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#define __FIX_RHOK__
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#include "fix.h"
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namespace LAMMPS_NS {
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class FixRhok : public Fix
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{
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public:
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// Constructor: all the parameters to this fix specified in
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// the LAMMPS input get passed in
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FixRhok( LAMMPS* inLMP, int inArgc, char** inArgv );
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virtual ~FixRhok();
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// Methods that this fix implements
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// --------------------------------
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// Tells LAMMPS where this fix should act
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int setmask();
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// Initializes the fix at the beginning of a run
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void init();
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// Initial application of the fix to a system (when doing MD / minimization)
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void setup( int inVFlag );
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void min_setup( int inVFlag );
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// Modify the forces calculated in the main force loop, either when
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// doing usual MD, RESPA MD or minimization
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void post_force( int inVFlag );
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void post_force_respa( int inVFlag, int inILevel, int inILoop );
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void min_post_force( int inVFlag );
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// Compute the change in the potential energy induced by this fix
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double compute_scalar();
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// Compute the ith component of the vector associated with this fix
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double compute_vector( int inI );
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private:
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// RESPA boilerplate
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int mNLevelsRESPA;
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// Defining parameters for this umbrella
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double mK[3], mKappa, mRhoK0;
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// Number of particles affected by the fix
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int mNThis;
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double mSqrtNThis;
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// Real and imaginary parts of rho_k := sum_i exp( - i k . r_i )
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double mRhoKLocal[2], mRhoKGlobal[2];
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};
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} // namespace LAMMPS_NS
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#endif // __FIX_RHOK__
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#endif // FIX_CLASS
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