src/nonbonded/SC.cpp

/*
 * Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
 *
 * The University of Notre Dame grants you ("Licensee") a
 * non-exclusive, royalty free, license to use, modify and
 * redistribute this software in source and binary code form, 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.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. All express or implied conditions, representations and
 * warranties, including any implied warranty of merchantability,
 * fitness for a particular purpose or non-infringement, are hereby
 * excluded.  The University of Notre Dame and its licensors shall not
 * be liable for any damages suffered by licensee as a result of
 * using, modifying or distributing the software or its
 * derivatives. In no event will the University of Notre Dame or its
 * licensors be liable for any lost revenue, profit or data, or for
 * direct, indirect, special, consequential, incidental or punitive
 * damages, however caused and regardless of the theory of liability,
 * arising out of the use of or inability to use software, even if the
 * University of Notre Dame has been advised of the possibility of
 * such damages.
 *
 * 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, 24107 (2008).          
 * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
 * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 */

#include <stdio.h>
#include <string.h>

#include <cmath>
#include "nonbonded/SC.hpp"
#include "utils/simError.h"
#include "types/NonBondedInteractionType.hpp"

namespace OpenMD {


  SC::SC() : name_("SC"), initialized_(false), forceField_(NULL), 
             scRcut_(0.0), np_(3000) {}
  
  SCParam SC::getSCParam(AtomType* atomType) {
    
    // Do sanity checking on the AtomType we were passed before
    // building any data structures:
    if (!atomType->isSC()) {
      sprintf( painCave.errMsg,
               "SC::getSCParam was passed an atomType (%s) that does not\n"
               "\tappear to be a Sutton-Chen (SC) atom.\n",
               atomType->getName().c_str());
      painCave.severity = OPENMD_ERROR;
      painCave.isFatal = 1;
      simError();
    }
    
    GenericData* data = atomType->getPropertyByName("SC");
    if (data == NULL) {
      sprintf( painCave.errMsg, "SC::getSCParam could not find SC\n"
               "\tparameters for atomType %s.\n", 
               atomType->getName().c_str());
      painCave.severity = OPENMD_ERROR;
      painCave.isFatal = 1;
      simError(); 
    }
    
    SCParamGenericData* scData = dynamic_cast<SCParamGenericData*>(data);
    if (scData == NULL) {
      sprintf( painCave.errMsg,
               "SC::getSCParam could not convert GenericData to SCParamGenericData\n"
               "\tfor atom type %s\n", atomType->getName().c_str());
      painCave.severity = OPENMD_ERROR;
      painCave.isFatal = 1;
      simError();          
    }
    
    return scData->getData();
  }

  RealType SC::getC(AtomType* atomType) {    
    SCParam scParam = getSCParam(atomType);
    return scParam.c;
  }

  RealType SC::getM(AtomType* atomType) {    
    SCParam scParam = getSCParam(atomType);
    return scParam.m;
  }

  RealType SC::getM(AtomType* atomType1, AtomType* atomType2) {    
    RealType m1 = getM(atomType1);
    RealType m2 = getM(atomType2);
    return 0.5 * (m1 + m2);
  }

  RealType SC::getN(AtomType* atomType) {    
    SCParam scParam = getSCParam(atomType);
    return scParam.n;
  }

  RealType SC::getN(AtomType* atomType1, AtomType* atomType2) {    
    RealType n1 = getN(atomType1);
    RealType n2 = getN(atomType2);
    return 0.5 * (n1 + n2);
  }

  RealType SC::getAlpha(AtomType* atomType) {    
    SCParam scParam = getSCParam(atomType);
    return scParam.alpha;
  }

  RealType SC::getAlpha(AtomType* atomType1, AtomType* atomType2) {    
    RealType alpha1 = getAlpha(atomType1);
    RealType alpha2 = getAlpha(atomType2);

    ForceFieldOptions& fopts = forceField_->getForceFieldOptions();
    std::string DistanceMix = fopts.getDistanceMixingRule();
    toUpper(DistanceMix);

    if (DistanceMix == "GEOMETRIC") 
      return sqrt(alpha1 * alpha2);
    else 
      return 0.5 * (alpha1 + alpha2);
  }

  RealType SC::getEpsilon(AtomType* atomType) {    
    SCParam scParam = getSCParam(atomType);
    return scParam.epsilon;
  }

  RealType SC::getEpsilon(AtomType* atomType1, AtomType* atomType2) {    
    RealType epsilon1 = getEpsilon(atomType1);
    RealType epsilon2 = getEpsilon(atomType2);
    return sqrt(epsilon1 * epsilon2);
  }

  void SC::initialize() { 
    // find all of the SC atom Types:
    ForceField::AtomTypeContainer* atomTypes = forceField_->getAtomTypes();
    ForceField::AtomTypeContainer::MapTypeIterator i;
    AtomType* at;

    for (at = atomTypes->beginType(i); at != NULL; 
         at = atomTypes->nextType(i)) {
      if (at->isSC())
        addType(at);
    }    
    initialized_ = true;
  }
  
  
  void SC::addType(AtomType* atomType){

    SCAtomData scAtomData;
    
    scAtomData.c = getC(atomType);
    scAtomData.m = getM(atomType);
    scAtomData.n = getN(atomType);
    scAtomData.alpha = getAlpha(atomType);
    scAtomData.epsilon = getEpsilon(atomType);
    scAtomData.rCut = 2.0 * scAtomData.alpha;

    // add it to the map:
    AtomTypeProperties atp = atomType->getATP();    

    pair<map<int,AtomType*>::iterator,bool> ret;    
    ret = SClist.insert( pair<int, AtomType*>(atp.ident, atomType) );
    if (ret.second == false) {
      sprintf( painCave.errMsg,
               "SC already had a previous entry with ident %d\n",
               atp.ident);
      painCave.severity = OPENMD_INFO;
      painCave.isFatal = 0;
      simError();         
    }

    SCMap[atomType] = scAtomData;
    
    // Now, iterate over all known types and add to the mixing map:
    
    map<AtomType*, SCAtomData>::iterator it;
    for( it = SCMap.begin(); it != SCMap.end(); ++it) {
      
      AtomType* atype2 = (*it).first;
      
      SCInteractionData mixer;

      mixer.alpha = getAlpha(atomType, atype2);
      mixer.rCut = 2.0 * mixer.alpha;
      mixer.epsilon = getEpsilon(atomType, atype2);
      mixer.m = getM(atomType, atype2);
      mixer.n = getN(atomType, atype2);

      RealType dr = mixer.rCut / (np_ - 1);
      vector<RealType> rvals;
      vector<RealType> vvals;
      vector<RealType> phivals;
    
      rvals.push_back(0.0);
      vvals.push_back(0.0);
      phivals.push_back(0.0);

      for (int k = 1; k < np_; k++) {
        RealType r = dr * k;
        rvals.push_back(r);
        vvals.push_back( mixer.epsilon * pow(mixer.alpha/r, mixer.n) );
        phivals.push_back( pow(mixer.alpha/r, mixer.m) );
      }

      mixer.vCut = mixer.epsilon * pow(mixer.alpha/mixer.rCut, mixer.n);
    
      CubicSpline* V = new CubicSpline();
      V->addPoints(rvals, vvals);
      
      CubicSpline* phi = new CubicSpline();
      phi->addPoints(rvals, phivals);
      
      mixer.V = V;
      mixer.phi = phi;

      mixer.explicitlySet = false;

      pair<AtomType*, AtomType*> key1, key2;
      key1 = make_pair(atomType, atype2);
      key2 = make_pair(atype2, atomType);
      
      MixingMap[key1] = mixer;
      if (key2 != key1) {
        MixingMap[key2] = mixer;
      }
    }      
    return;
  }
  
  void SC::addExplicitInteraction(AtomType* atype1, AtomType* atype2, 
                                  RealType epsilon, RealType m, RealType n,
                                  RealType alpha) {
    
    // in case these weren't already in the map
    addType(atype1);
    addType(atype2);

    SCInteractionData mixer;

    mixer.epsilon = epsilon;
    mixer.m = m;
    mixer.n = n;
    mixer.alpha = alpha;
    mixer.rCut = 2.0 * mixer.alpha;
    
    RealType dr = mixer.rCut / (np_ - 1);
    vector<RealType> rvals;
    vector<RealType> vvals;
    vector<RealType> phivals;
    
    rvals.push_back(0.0);
    vvals.push_back(0.0);
    phivals.push_back(0.0);
    
    for (int k = 1; k < np_; k++) {
      RealType r = dr * k;
      rvals.push_back(r);
      vvals.push_back( mixer.epsilon * pow(mixer.alpha/r, mixer.n) );
      phivals.push_back( pow(mixer.alpha/r, mixer.m) );
    }
    
    mixer.vCut = mixer.epsilon * pow(mixer.alpha/mixer.rCut, mixer.n);
    
    CubicSpline* V = new CubicSpline();
    V->addPoints(rvals, vvals);
    
    CubicSpline* phi = new CubicSpline();
    phi->addPoints(rvals, phivals);
    
    mixer.V = V;
    mixer.phi = phi;
    
    mixer.explicitlySet = true;

    pair<AtomType*, AtomType*> key1, key2;
    key1 = make_pair(atype1, atype2);
    key2 = make_pair(atype2, atype1);
    
    MixingMap[key1] = mixer;
    if (key2 != key1) {
      MixingMap[key2] = mixer;
    }    
    return;
  }

  void SC::calcDensity(InteractionData &idat) {
    
    if (!initialized_) initialize();
    
    SCInteractionData mixer = MixingMap[ idat.atypes ];

    RealType rcij = mixer.rCut;

    if ( *(idat.rij)  < rcij) {
      RealType rho = mixer.phi->getValueAt( *(idat.rij) );
      *(idat.rho1) += rho;
      *(idat.rho2) += rho;
    } 
    
    return;
  }

  void SC::calcFunctional(SelfData &sdat) {

    if (!initialized_) initialize();

    SCAtomData data1 = SCMap[sdat.atype];
   
    RealType u = - data1.c * data1.epsilon * sqrt( *(sdat.rho) );
    *(sdat.frho) = u;
    *(sdat.dfrhodrho) = 0.5 * *(sdat.frho) / *(sdat.rho);

    (*(sdat.pot))[METALLIC_FAMILY] += u;
    *(sdat.particlePot) += u;
    
    return;
  }
  
 
  void SC::calcForce(InteractionData &idat) {
    
    if (!initialized_) initialize();
    
    SCAtomData data1 = SCMap[idat.atypes.first];
    SCAtomData data2 = SCMap[idat.atypes.second];

    SCInteractionData mixer = MixingMap[idat.atypes];

    RealType rcij = mixer.rCut;

    if ( *(idat.rij)  < rcij) {
      RealType vcij = mixer.vCut;
      
      pair<RealType, RealType> res;
      
      res = mixer.phi->getValueAndDerivativeAt( *(idat.rij) );
      RealType rhtmp = res.first;
      RealType drhodr = res.second;
      
      res = mixer.V->getValueAndDerivativeAt( *(idat.rij) );
      RealType vptmp = res.first;
      RealType dvpdr = res.second;
      
      RealType pot_temp = vptmp - vcij;
      *(idat.vpair) += pot_temp;
      
      RealType dudr = drhodr * ( *(idat.dfrho1) + *(idat.dfrho2) ) + dvpdr;
      
      *(idat.f1) += *(idat.d) * dudr / *(idat.rij) ;
        
      // particlePot is the difference between the full potential and
      // the full potential without the presence of a particular
      // particle (atom1).
      //
      // This reduces the density at other particle locations, so we
      // need to recompute the density at atom2 assuming atom1 didn't
      // contribute.  This then requires recomputing the density
      // functional for atom2 as well.
           
      *(idat.particlePot1) -= data2.c * data2.epsilon * 
        sqrt( *(idat.rho2) - rhtmp) + *(idat.frho2);

      *(idat.particlePot2) -= data1.c * data1.epsilon * 
        sqrt( *(idat.rho1) - rhtmp) + *(idat.frho1);
      
      (*(idat.pot))[METALLIC_FAMILY] += pot_temp;
    }
      
    return;    
  }

  RealType SC::getSuggestedCutoffRadius(pair<AtomType*, AtomType*> atypes) {
    if (!initialized_) initialize();   

    map<pair<AtomType*, AtomType*>, SCInteractionData>::iterator it;
    it = MixingMap.find(atypes);
    if (it == MixingMap.end()) 
      return 0.0;
    else  {
      SCInteractionData mixer = (*it).second;
      return mixer.rCut;
    }
  }
}
Revision:	1665
Committed:	Tue Nov 22 20:38:56 2011 UTC (13 years, 5 months ago) by gezelter
File size:	12260 byte(s)
Log Message:	updated copyright notices
#	Content
1	/*
2	* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved.
3	*
4	* The University of Notre Dame grants you ("Licensee") a
5	* non-exclusive, royalty free, license to use, modify and
6	* redistribute this software in source and binary code form, provided
7	* that the following conditions are met:
8	*
9	* 1. Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.
11	*
12	* 2. Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the
15	* distribution.
16	*
17	* This software is provided "AS IS," without a warranty of any
18	* kind. All express or implied conditions, representations and
19	* warranties, including any implied warranty of merchantability,
20	* fitness for a particular purpose or non-infringement, are hereby
21	* excluded. The University of Notre Dame and its licensors shall not
22	* be liable for any damages suffered by licensee as a result of
23	* using, modifying or distributing the software or its
24	* derivatives. In no event will the University of Notre Dame or its
25	* licensors be liable for any lost revenue, profit or data, or for
26	* direct, indirect, special, consequential, incidental or punitive
27	* damages, however caused and regardless of the theory of liability,
28	* arising out of the use of or inability to use software, even if the
29	* University of Notre Dame has been advised of the possibility of
30	* such damages.
31	*
32	* SUPPORT OPEN SCIENCE! If you use OpenMD or its source code in your
33	* research, please cite the appropriate papers when you publish your
34	* work. Good starting points are:
35	*
36	* [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
37	* [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
38	* [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).
39	* [4] Kuang & Gezelter, J. Chem. Phys. 133, 164101 (2010).
40	* [5] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
41	*/
42
43	#include <stdio.h>
44	#include <string.h>
45
46	#include <cmath>
47	#include "nonbonded/SC.hpp"
48	#include "utils/simError.h"
49	#include "types/NonBondedInteractionType.hpp"
50
51	namespace OpenMD {
52
53
54	SC::SC() : name_("SC"), initialized_(false), forceField_(NULL),
55	scRcut_(0.0), np_(3000) {}
56
57	SCParam SC::getSCParam(AtomType* atomType) {
58
59	// Do sanity checking on the AtomType we were passed before
60	// building any data structures:
61	if (!atomType->isSC()) {
62	sprintf( painCave.errMsg,
63	"SC::getSCParam was passed an atomType (%s) that does not\n"
64	"\tappear to be a Sutton-Chen (SC) atom.\n",
65	atomType->getName().c_str());
66	painCave.severity = OPENMD_ERROR;
67	painCave.isFatal = 1;
68	simError();
69	}
70
71	GenericData* data = atomType->getPropertyByName("SC");
72	if (data == NULL) {
73	sprintf( painCave.errMsg, "SC::getSCParam could not find SC\n"
74	"\tparameters for atomType %s.\n",
75	atomType->getName().c_str());
76	painCave.severity = OPENMD_ERROR;
77	painCave.isFatal = 1;
78	simError();
79	}
80
81	SCParamGenericData* scData = dynamic_cast<SCParamGenericData*>(data);
82	if (scData == NULL) {
83	sprintf( painCave.errMsg,
84	"SC::getSCParam could not convert GenericData to SCParamGenericData\n"
85	"\tfor atom type %s\n", atomType->getName().c_str());
86	painCave.severity = OPENMD_ERROR;
87	painCave.isFatal = 1;
88	simError();
89	}
90
91	return scData->getData();
92	}
93
94	RealType SC::getC(AtomType* atomType) {
95	SCParam scParam = getSCParam(atomType);
96	return scParam.c;
97	}
98
99	RealType SC::getM(AtomType* atomType) {
100	SCParam scParam = getSCParam(atomType);
101	return scParam.m;
102	}
103
104	RealType SC::getM(AtomType* atomType1, AtomType* atomType2) {
105	RealType m1 = getM(atomType1);
106	RealType m2 = getM(atomType2);
107	return 0.5 * (m1 + m2);
108	}
109
110	RealType SC::getN(AtomType* atomType) {
111	SCParam scParam = getSCParam(atomType);
112	return scParam.n;
113	}
114
115	RealType SC::getN(AtomType* atomType1, AtomType* atomType2) {
116	RealType n1 = getN(atomType1);
117	RealType n2 = getN(atomType2);
118	return 0.5 * (n1 + n2);
119	}
120
121	RealType SC::getAlpha(AtomType* atomType) {
122	SCParam scParam = getSCParam(atomType);
123	return scParam.alpha;
124	}
125
126	RealType SC::getAlpha(AtomType* atomType1, AtomType* atomType2) {
127	RealType alpha1 = getAlpha(atomType1);
128	RealType alpha2 = getAlpha(atomType2);
129
130	ForceFieldOptions& fopts = forceField_->getForceFieldOptions();
131	std::string DistanceMix = fopts.getDistanceMixingRule();
132	toUpper(DistanceMix);
133
134	if (DistanceMix == "GEOMETRIC")
135	return sqrt(alpha1 * alpha2);
136	else
137	return 0.5 * (alpha1 + alpha2);
138	}
139
140	RealType SC::getEpsilon(AtomType* atomType) {
141	SCParam scParam = getSCParam(atomType);
142	return scParam.epsilon;
143	}
144
145	RealType SC::getEpsilon(AtomType* atomType1, AtomType* atomType2) {
146	RealType epsilon1 = getEpsilon(atomType1);
147	RealType epsilon2 = getEpsilon(atomType2);
148	return sqrt(epsilon1 * epsilon2);
149	}
150
151	void SC::initialize() {
152	// find all of the SC atom Types:
153	ForceField::AtomTypeContainer* atomTypes = forceField_->getAtomTypes();
154	ForceField::AtomTypeContainer::MapTypeIterator i;
155	AtomType* at;
156
157	for (at = atomTypes->beginType(i); at != NULL;
158	at = atomTypes->nextType(i)) {
159	if (at->isSC())
160	addType(at);
161	}
162	initialized_ = true;
163	}
164
165
166
167	void SC::addType(AtomType* atomType){
168
169	SCAtomData scAtomData;
170
171	scAtomData.c = getC(atomType);
172	scAtomData.m = getM(atomType);
173	scAtomData.n = getN(atomType);
174	scAtomData.alpha = getAlpha(atomType);
175	scAtomData.epsilon = getEpsilon(atomType);
176	scAtomData.rCut = 2.0 * scAtomData.alpha;
177
178	// add it to the map:
179	AtomTypeProperties atp = atomType->getATP();
180
181	pair<map<int,AtomType*>::iterator,bool> ret;
182	ret = SClist.insert( pair<int, AtomType*>(atp.ident, atomType) );
183	if (ret.second == false) {
184	sprintf( painCave.errMsg,
185	"SC already had a previous entry with ident %d\n",
186	atp.ident);
187	painCave.severity = OPENMD_INFO;
188	painCave.isFatal = 0;
189	simError();
190	}
191
192	SCMap[atomType] = scAtomData;
193
194	// Now, iterate over all known types and add to the mixing map:
195
196	map<AtomType*, SCAtomData>::iterator it;
197	for( it = SCMap.begin(); it != SCMap.end(); ++it) {
198
199	AtomType* atype2 = (*it).first;
200
201	SCInteractionData mixer;
202
203	mixer.alpha = getAlpha(atomType, atype2);
204	mixer.rCut = 2.0 * mixer.alpha;
205	mixer.epsilon = getEpsilon(atomType, atype2);
206	mixer.m = getM(atomType, atype2);
207	mixer.n = getN(atomType, atype2);
208
209	RealType dr = mixer.rCut / (np_ - 1);
210	vector<RealType> rvals;
211	vector<RealType> vvals;
212	vector<RealType> phivals;
213
214	rvals.push_back(0.0);
215	vvals.push_back(0.0);
216	phivals.push_back(0.0);
217
218	for (int k = 1; k < np_; k++) {
219	RealType r = dr * k;
220	rvals.push_back(r);
221	vvals.push_back( mixer.epsilon * pow(mixer.alpha/r, mixer.n) );
222	phivals.push_back( pow(mixer.alpha/r, mixer.m) );
223	}
224
225	mixer.vCut = mixer.epsilon * pow(mixer.alpha/mixer.rCut, mixer.n);
226
227	CubicSpline* V = new CubicSpline();
228	V->addPoints(rvals, vvals);
229
230	CubicSpline* phi = new CubicSpline();
231	phi->addPoints(rvals, phivals);
232
233	mixer.V = V;
234	mixer.phi = phi;
235
236	mixer.explicitlySet = false;
237
238	pair<AtomType, AtomType> key1, key2;
239	key1 = make_pair(atomType, atype2);
240	key2 = make_pair(atype2, atomType);
241
242	MixingMap[key1] = mixer;
243	if (key2 != key1) {
244	MixingMap[key2] = mixer;
245	}
246	}
247	return;
248	}
249
250	void SC::addExplicitInteraction(AtomType* atype1, AtomType* atype2,
251	RealType epsilon, RealType m, RealType n,
252	RealType alpha) {
253
254	// in case these weren't already in the map
255	addType(atype1);
256	addType(atype2);
257
258	SCInteractionData mixer;
259
260	mixer.epsilon = epsilon;
261	mixer.m = m;
262	mixer.n = n;
263	mixer.alpha = alpha;
264	mixer.rCut = 2.0 * mixer.alpha;
265
266	RealType dr = mixer.rCut / (np_ - 1);
267	vector<RealType> rvals;
268	vector<RealType> vvals;
269	vector<RealType> phivals;
270
271	rvals.push_back(0.0);
272	vvals.push_back(0.0);
273	phivals.push_back(0.0);
274
275	for (int k = 1; k < np_; k++) {
276	RealType r = dr * k;
277	rvals.push_back(r);
278	vvals.push_back( mixer.epsilon * pow(mixer.alpha/r, mixer.n) );
279	phivals.push_back( pow(mixer.alpha/r, mixer.m) );
280	}
281
282	mixer.vCut = mixer.epsilon * pow(mixer.alpha/mixer.rCut, mixer.n);
283
284	CubicSpline* V = new CubicSpline();
285	V->addPoints(rvals, vvals);
286
287	CubicSpline* phi = new CubicSpline();
288	phi->addPoints(rvals, phivals);
289
290	mixer.V = V;
291	mixer.phi = phi;
292
293	mixer.explicitlySet = true;
294
295	pair<AtomType, AtomType> key1, key2;
296	key1 = make_pair(atype1, atype2);
297	key2 = make_pair(atype2, atype1);
298
299	MixingMap[key1] = mixer;
300	if (key2 != key1) {
301	MixingMap[key2] = mixer;
302	}
303	return;
304	}
305
306	void SC::calcDensity(InteractionData &idat) {
307
308	if (!initialized_) initialize();
309
310	SCInteractionData mixer = MixingMap[ idat.atypes ];
311
312	RealType rcij = mixer.rCut;
313
314	if ( *(idat.rij) < rcij) {
315	RealType rho = mixer.phi->getValueAt( *(idat.rij) );
316	*(idat.rho1) += rho;
317	*(idat.rho2) += rho;
318	}
319
320	return;
321	}
322
323	void SC::calcFunctional(SelfData &sdat) {
324
325	if (!initialized_) initialize();
326
327	SCAtomData data1 = SCMap[sdat.atype];
328
329	RealType u = - data1.c * data1.epsilon * sqrt( *(sdat.rho) );
330	*(sdat.frho) = u;
331	(sdat.dfrhodrho) = 0.5 (sdat.frho) / (sdat.rho);
332
333	(*(sdat.pot))[METALLIC_FAMILY] += u;
334	*(sdat.particlePot) += u;
335
336	return;
337	}
338
339
340	void SC::calcForce(InteractionData &idat) {
341
342	if (!initialized_) initialize();
343
344	SCAtomData data1 = SCMap[idat.atypes.first];
345	SCAtomData data2 = SCMap[idat.atypes.second];
346
347	SCInteractionData mixer = MixingMap[idat.atypes];
348
349	RealType rcij = mixer.rCut;
350
351	if ( *(idat.rij) < rcij) {
352	RealType vcij = mixer.vCut;
353
354	pair<RealType, RealType> res;
355
356	res = mixer.phi->getValueAndDerivativeAt( *(idat.rij) );
357	RealType rhtmp = res.first;
358	RealType drhodr = res.second;
359
360	res = mixer.V->getValueAndDerivativeAt( *(idat.rij) );
361	RealType vptmp = res.first;
362	RealType dvpdr = res.second;
363
364	RealType pot_temp = vptmp - vcij;
365	*(idat.vpair) += pot_temp;
366
367	RealType dudr = drhodr * ( (idat.dfrho1) + (idat.dfrho2) ) + dvpdr;
368
369	(idat.f1) += (idat.d) * dudr / *(idat.rij) ;
370
371	// particlePot is the difference between the full potential and
372	// the full potential without the presence of a particular
373	// particle (atom1).
374	//
375	// This reduces the density at other particle locations, so we
376	// need to recompute the density at atom2 assuming atom1 didn't
377	// contribute. This then requires recomputing the density
378	// functional for atom2 as well.
379
380	(idat.particlePot1) -= data2.c data2.epsilon *
381	sqrt( (idat.rho2) - rhtmp) + (idat.frho2);
382
383	(idat.particlePot2) -= data1.c data1.epsilon *
384	sqrt( (idat.rho1) - rhtmp) + (idat.frho1);
385
386	(*(idat.pot))[METALLIC_FAMILY] += pot_temp;
387	}
388
389	return;
390	}
391
392	RealType SC::getSuggestedCutoffRadius(pair<AtomType, AtomType> atypes) {
393	if (!initialized_) initialize();
394
395	map<pair<AtomType, AtomType>, SCInteractionData>::iterator it;
396	it = MixingMap.find(atypes);
397	if (it == MixingMap.end())
398	return 0.0;
399	else {
400	SCInteractionData mixer = (*it).second;
401	return mixer.rCut;
402	}
403	}
404	}