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root/group/trunk/OOPSE-4/src/integrators/SMIPDForceManager.cpp
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Comparing trunk/OOPSE-4/src/integrators/SMIPDForceManager.cpp (file contents):
Revision 3473 by chuckv, Fri Nov 14 15:44:34 2008 UTC vs.
Revision 3504 by gezelter, Wed May 13 22:27:29 2009 UTC

# Line 43 | Line 43
43   #include "integrators/SMIPDForceManager.hpp"
44   #include "math/CholeskyDecomposition.hpp"
45   #include "utils/OOPSEConstant.hpp"
46 – #include "hydrodynamics/Sphere.hpp"
47 – #include "hydrodynamics/Ellipsoid.hpp"
48 – #include "utils/ElementsTable.hpp"
46   #include "math/ConvexHull.hpp"
47   #include "math/Triangle.hpp"
48  
52 –
49   namespace oopse {
50  
51 <  SMIPDForceManager::SMIPDForceManager(SimInfo* info) : ForceManager(info), forceTolerance_(1e-6), maxIterNum_(4) {
51 >  SMIPDForceManager::SMIPDForceManager(SimInfo* info) : ForceManager(info) {
52 >
53      simParams = info->getSimParams();
54      veloMunge = new Velocitizer(info);
55      
56      // Create Hull, Convex Hull for now, other options later.
57 +    
58      surfaceMesh_ = new ConvexHull();
61 –
59      
63 –    
60      /* Check that the simulation has target pressure and target
61 <       temperature set*/
62 <
61 >       temperature set */
62 >    
63      if (!simParams->haveTargetTemp()) {
64 <      sprintf(painCave.errMsg, "You can't use the SMIPDynamics integrator without a targetTemp!\n");
64 >      sprintf(painCave.errMsg,
65 >              "SMIPDynamics error: You can't use the SMIPD integrator\n"
66 >              "   without a targetTemp!\n");      
67        painCave.isFatal = 1;
68        painCave.severity = OOPSE_ERROR;
69        simError();
70      } else {
71        targetTemp_ = simParams->getTargetTemp();
72      }
73 <
73 >    
74      if (!simParams->haveTargetPressure()) {
75 <      sprintf(painCave.errMsg, "SMIPDynamics error: You can't use the SMIPD integrator\n"
76 <              "   without a targetPressure!\n");
77 <      
75 >      sprintf(painCave.errMsg,
76 >              "SMIPDynamics error: You can't use the SMIPD integrator\n"
77 >              "   without a targetPressure!\n");      
78        painCave.isFatal = 1;
79        simError();
80      } else {
81 <      targetPressure_ = simParams->getTargetPressure()/OOPSEConstant::pressureConvert;
81 >      // Convert pressure from atm -> amu/(fs^2*Ang)
82 >      targetPressure_ = simParams->getTargetPressure() /
83 >        OOPSEConstant::pressureConvert;
84      }
85 –
85    
86      if (simParams->getUsePeriodicBoundaryConditions()) {
87 <      sprintf(painCave.errMsg, "SMIPDynamics error: You can't use the SMIPD integrator\n"
88 <              "   with periodic boundary conditions !\n");
89 <      
87 >      sprintf(painCave.errMsg,
88 >              "SMIPDynamics error: You can't use the SMIPD integrator\n"
89 >              "   with periodic boundary conditions!\n");    
90        painCave.isFatal = 1;
91        simError();
92      }
93 <
93 >    
94      if (!simParams->haveViscosity()) {
95 <      sprintf(painCave.errMsg, "You can't use SMIPDynamics without a viscosity!\n");
95 >      sprintf(painCave.errMsg,
96 >              "SMIPDynamics error: You can't use the SMIPD integrator\n"
97 >              "   without a viscosity!\n");
98        painCave.isFatal = 1;
99        painCave.severity = OOPSE_ERROR;
100        simError();
101 +    }else{
102 +      viscosity_ = simParams->getViscosity();
103      }
101 –
102 –
104      
105 +    dt_ = simParams->getDt();
106 +  
107 +    variance_ = 2.0 * OOPSEConstant::kb * targetTemp_ / dt_;
108  
109 <    //Compute initial hull
110 <    /*
107 <    surfaceMesh_->computeHull(localSites_);
108 <    Area0_ = surfaceMesh_->getArea();
109 <    int nTriangles = surfaceMesh_->getNMeshElements();
110 <    //    variance_ = 2.0 * OOPSEConstant::kb*simParams->getTargetTemp()/simParams->getDt();
111 <    gamma_0_ = (NumericConstant::PI * targetPressure_* targetPressure_ * Area0_ * Area0_ * simParams->getDt()) /
112 <      (4.0 * nTriangles * nTriangles* OOPSEConstant::kb*simParams->getTargetTemp());
113 <    //RealType eta0 = gamma_0/
114 <    */
115 <
116 <    // Build the hydroProp map:
117 <    std::map<std::string, HydroProp*> hydroPropMap;
118 <
109 >    // Build a vector of integrable objects to determine if the are
110 >    // surface atoms
111      Molecule* mol;
112      StuntDouble* integrableObject;
113      SimInfo::MoleculeIterator i;
114 <    Molecule::IntegrableObjectIterator  j;              
115 <    bool needHydroPropFile = false;
116 <    
117 <    for (mol = info->beginMolecule(i); mol != NULL;
126 <         mol = info->nextMolecule(i)) {
114 >    Molecule::IntegrableObjectIterator  j;
115 >
116 >    for (mol = info_->beginMolecule(i); mol != NULL;
117 >         mol = info_->nextMolecule(i)) {          
118        for (integrableObject = mol->beginIntegrableObject(j);
119             integrableObject != NULL;
129 –           integrableObject = mol->nextIntegrableObject(j)) {
130 –        
131 –        if (integrableObject->isRigidBody()) {
132 –          RigidBody* rb = static_cast<RigidBody*>(integrableObject);
133 –          if (rb->getNumAtoms() > 1) needHydroPropFile = true;
134 –        }
135 –        
136 –      }
137 –    }
138 –        
139 –
140 –    if (needHydroPropFile) {              
141 –      if (simParams->haveHydroPropFile()) {
142 –        hydroPropMap = parseFrictionFile(simParams->getHydroPropFile());
143 –      } else {              
144 –        sprintf( painCave.errMsg,
145 –                 "HydroPropFile must be set to a file name if SMIPDynamics\n"
146 –                 "\tis specified for rigidBodies which contain more than one atom\n"
147 –                 "\tTo create a HydroPropFile, run the \"Hydro\" program.\n\n"
148 –                 "\tFor use with SMIPD, the default viscosity in Hydro should be\n"
149 –                 "\tset to 1.0 because the friction and random forces will be\n"
150 –                 "\tdynamically re-set assuming this is true.\n");
151 –        painCave.severity = OOPSE_ERROR;
152 –        painCave.isFatal = 1;
153 –        simError();  
154 –      }      
155 –
156 –      for (mol = info->beginMolecule(i); mol != NULL;
157 –           mol = info->nextMolecule(i)) {
158 –        for (integrableObject = mol->beginIntegrableObject(j);
159 –             integrableObject != NULL;
160 –             integrableObject = mol->nextIntegrableObject(j)) {
161 –
162 –          std::map<std::string, HydroProp*>::iterator iter = hydroPropMap.find(integrableObject->getType());
163 –          if (iter != hydroPropMap.end()) {
164 –            hydroProps_.push_back(iter->second);
165 –          } else {
166 –            sprintf( painCave.errMsg,
167 –                     "Can not find resistance tensor for atom [%s]\n", integrableObject->getType().c_str());
168 –            painCave.severity = OOPSE_ERROR;
169 –            painCave.isFatal = 1;
170 –            simError();  
171 –          }        
172 –        }
173 –      }
174 –    } else {
175 –      
176 –      std::map<std::string, HydroProp*> hydroPropMap;
177 –      for (mol = info->beginMolecule(i); mol != NULL;
178 –           mol = info->nextMolecule(i)) {
179 –        for (integrableObject = mol->beginIntegrableObject(j);
180 –             integrableObject != NULL;
181 –             integrableObject = mol->nextIntegrableObject(j)) {
182 –          Shape* currShape = NULL;
183 –
184 –          if (integrableObject->isAtom()){
185 –            Atom* atom = static_cast<Atom*>(integrableObject);
186 –            AtomType* atomType = atom->getAtomType();
187 –            if (atomType->isGayBerne()) {
188 –              DirectionalAtomType* dAtomType = dynamic_cast<DirectionalAtomType*>(atomType);              
189 –              GenericData* data = dAtomType->getPropertyByName("GayBerne");
190 –              if (data != NULL) {
191 –                GayBerneParamGenericData* gayBerneData = dynamic_cast<GayBerneParamGenericData*>(data);
192 –                
193 –                if (gayBerneData != NULL) {  
194 –                  GayBerneParam gayBerneParam = gayBerneData->getData();
195 –                  currShape = new Ellipsoid(V3Zero,
196 –                                            gayBerneParam.GB_l / 2.0,
197 –                                            gayBerneParam.GB_d / 2.0,
198 –                                            Mat3x3d::identity());
199 –                } else {
200 –                  sprintf( painCave.errMsg,
201 –                           "Can not cast GenericData to GayBerneParam\n");
202 –                  painCave.severity = OOPSE_ERROR;
203 –                  painCave.isFatal = 1;
204 –                  simError();  
205 –                }
206 –              } else {
207 –                sprintf( painCave.errMsg, "Can not find Parameters for GayBerne\n");
208 –                painCave.severity = OOPSE_ERROR;
209 –                painCave.isFatal = 1;
210 –                simError();    
211 –              }
212 –            } else {
213 –              if (atomType->isLennardJones()){
214 –                GenericData* data = atomType->getPropertyByName("LennardJones");
215 –                if (data != NULL) {
216 –                  LJParamGenericData* ljData = dynamic_cast<LJParamGenericData*>(data);
217 –                  if (ljData != NULL) {
218 –                    LJParam ljParam = ljData->getData();
219 –                    currShape = new Sphere(atom->getPos(), 2.0);
220 –                  } else {
221 –                    sprintf( painCave.errMsg,
222 –                             "Can not cast GenericData to LJParam\n");
223 –                    painCave.severity = OOPSE_ERROR;
224 –                    painCave.isFatal = 1;
225 –                    simError();          
226 –                  }      
227 –                }
228 –              } else {
229 –                int aNum = etab.GetAtomicNum((atom->getType()).c_str());
230 –                if (aNum != 0) {
231 –                  currShape = new Sphere(atom->getPos(), 2.0);
232 –                } else {
233 –                  sprintf( painCave.errMsg,
234 –                           "Could not find atom type in default element.txt\n");
235 –                  painCave.severity = OOPSE_ERROR;
236 –                  painCave.isFatal = 1;
237 –                  simError();          
238 –                }
239 –              }
240 –            }
241 –          }
242 –          HydroProp* currHydroProp = currShape->getHydroProp(1.0,simParams->getTargetTemp());
243 –          std::map<std::string, HydroProp*>::iterator iter = hydroPropMap.find(integrableObject->getType());
244 –          if (iter != hydroPropMap.end())
245 –            hydroProps_.push_back(iter->second);
246 –          else {
247 –            currHydroProp->complete();
248 –            hydroPropMap.insert(std::map<std::string, HydroProp*>::value_type(integrableObject->getType(), currHydroProp));
249 –            hydroProps_.push_back(currHydroProp);
250 –          }
251 –        }
252 –      }
253 –    }
254 –
255 –    /* Compute hull first time through to get the area of t=0*/
256 –
257 –    //Build a vector of integrable objects to determine if the are surface atoms
258 –    for (mol = info_->beginMolecule(i); mol != NULL; mol = info_->nextMolecule(i)) {          
259 –      for (integrableObject = mol->beginIntegrableObject(j); integrableObject != NULL;
120             integrableObject = mol->nextIntegrableObject(j)) {  
121          localSites_.push_back(integrableObject);
122        }
123 <    }
264 <
265 <
123 >    }  
124    }  
267 –
268 –  std::map<std::string, HydroProp*> SMIPDForceManager::parseFrictionFile(const std::string& filename) {
269 –    std::map<std::string, HydroProp*> props;
270 –    std::ifstream ifs(filename.c_str());
271 –    if (ifs.is_open()) {
272 –      
273 –    }
274 –    
275 –    const unsigned int BufferSize = 65535;
276 –    char buffer[BufferSize];  
277 –    while (ifs.getline(buffer, BufferSize)) {
278 –      HydroProp* currProp = new HydroProp(buffer);
279 –      props.insert(std::map<std::string, HydroProp*>::value_type(currProp->getName(), currProp));
280 –    }
281 –
282 –    return props;
283 –  }
125    
126    void SMIPDForceManager::postCalculation(bool needStress){
127      SimInfo::MoleculeIterator i;
128      Molecule::IntegrableObjectIterator  j;
129      Molecule* mol;
130      StuntDouble* integrableObject;
290 –    RealType mass;
291 –    Vector3d pos;
292 –    Vector3d frc;
293 –    Mat3x3d A;
294 –    Mat3x3d Atrans;
295 –    Vector3d Tb;
296 –    Vector3d ji;
297 –    unsigned int index = 0;
298 –    int fdf;
299 –  
300 –    fdf = 0;
131    
132 <    /*Compute surface Mesh*/
132 >    // Compute surface Mesh
133      surfaceMesh_->computeHull(localSites_);
134  
135 <    /* Get area and number of surface stunt doubles and compute new variance */
136 <     RealType area = surfaceMesh_->getArea();
137 <     int nSurfaceSDs = surfaceMesh_->getNs();
308 <
309 <    
135 >    // Get total area and number of surface stunt doubles
136 >    RealType area = surfaceMesh_->getArea();
137 >    int nSurfaceSDs = surfaceMesh_->getNs();
138      std::vector<Triangle> sMesh = surfaceMesh_->getMesh();
139      int nTriangles = sMesh.size();
140  
141 +    // Generate all of the necessary random forces
142 +    std::vector<Vector3d>  randNums = genTriangleForces(nTriangles, variance_);
143  
144 <
145 <     /* Compute variance for random forces */
316 <  
317 <
318 <
319 <
320 <    std::vector<RealType>  randNums = genTriangleForces(nTriangles, 1.0);
321 <
322 <    /* Loop over the mesh faces and apply random force to each of the faces*/
323 <    
324 <    
144 >    // Loop over the mesh faces and apply external pressure to each
145 >    // of the faces
146      std::vector<Triangle>::iterator face;
147      std::vector<StuntDouble*>::iterator vertex;
148 <    int thisNumber = 0;
148 >    int thisFacet = 0;
149      for (face = sMesh.begin(); face != sMesh.end(); ++face){
150      
151        Triangle thisTriangle = *face;
152        std::vector<StuntDouble*> vertexSDs = thisTriangle.getVertices();
153        RealType thisArea = thisTriangle.getArea();
333 –      // RealType sigma_t = sqrt(NumericConstant::PI/2.0)*((targetPressure_)*thisArea) /OOPSEConstant::energyConvert;
334 –      // gamma_t_ = (NumericConstant::PI * targetPressure_* targetPressure_ * thisArea * thisArea * simParams->getDt()) /(4.0 * OOPSEConstant::kB*simParams->getTargetTemp());
335 –
336 –      /* Get Random Force */
154        Vector3d unitNormal = thisTriangle.getNormal();
155        unitNormal.normalize();
339 –      //Vector3d randomForce = -randNums[thisNumber] * sigma_t * unitNormal;
156        Vector3d centroid = thisTriangle.getCentroid();
157        Vector3d facetVel = thisTriangle.getFacetVelocity();
342 –      RealType hydroLength = thisTriangle.getIncircleRadius()*2.0/3.14;
158  
159 <      RealType f_normal = simParams->getViscosity()*hydroLength*1.439326479e4*OOPSEConstant::energyConvert;
345 <      RealType extPressure = -(targetPressure_ * thisArea);
346 <      RealType randomForce = randNums[thisNumber] * f_normal * OOPSEConstant::kb*simParams->getTargetTemp()/simParams->getDt();
347 <      RealType dragForce = -f_normal * dot(facetVel, unitNormal);      
348 <      Vector3d langevinForce = (extPressure + randomForce + dragForce) * unitNormal;
349 <      
350 <      //      Vector3d dragForce = - gamma_t_ * dot(facetVel, unitNormal) * unitNormal / OOPSEConstant::energyConvert;
351 <      
352 <      //std::cout << "randomForce " << randomForce << " dragForce " << dragForce <<  " hydro  " << hydroLength << std::endl;
159 >      Mat3x3d hydroTensor = thisTriangle.computeHydrodynamicTensor(viscosity_);
160  
161 +      hydroTensor *= OOPSEConstant::viscoConvert;
162 +      Mat3x3d S;
163 +      CholeskyDecomposition(hydroTensor, S);
164  
165 <      for (vertex = vertexSDs.begin(); vertex != vertexSDs.end(); ++vertex){
166 <        if ((*vertex) != NULL){
167 <          // mass = integrableObject->getMass();
358 <          Vector3d vertexForce = langevinForce/3.0;
359 <          (*vertex)->addFrc(vertexForce);
165 >      Vector3d extPressure = -unitNormal*(targetPressure_ * thisArea)/OOPSEConstant::energyConvert;      
166 >      Vector3d randomForce = S * randNums[thisFacet++];
167 >      Vector3d dragForce = -hydroTensor * facetVel;
168  
169 <          if ((*vertex)->isDirectional()){
169 >      Vector3d langevinForce = (extPressure + randomForce + dragForce);
170  
171 +      // Apply triangle force to stuntdouble vertices
172 +      for (vertex = vertexSDs.begin(); vertex != vertexSDs.end(); ++vertex){
173 +        if ((*vertex) != NULL){
174 +          Vector3d vertexForce = langevinForce / 3.0;
175 +          (*vertex)->addFrc(vertexForce);          
176 +          if ((*vertex)->isDirectional()){          
177              Vector3d vertexPos = (*vertex)->getPos();
178              Vector3d vertexCentroidVector = vertexPos - centroid;
179              (*vertex)->addTrq(cross(vertexCentroidVector,vertexForce));
# Line 367 | Line 181 | namespace oopse {
181          }  
182        }
183      }
370 –
371 –    /* Now loop over all surface particles and apply the drag*/
372 –    /*
373 –    std::vector<StuntDouble*> surfaceSDs = surfaceMesh_->getSurfaceAtoms();
374 –    for (vertex = surfaceSDs.begin(); vertex != surfaceSDs.end(); ++vertex){
375 –      integrableObject = *vertex;
376 –      mass = integrableObject->getMass();
377 –      if (integrableObject->isDirectional()){
378 –        
379 –        // preliminaries for directional objects:
380 –        
381 –        A = integrableObject->getA();
382 –        Atrans = A.transpose();
383 –        Vector3d rcrLab = Atrans * hydroProps_[index]->getCOR();  
384 –        //apply random force and torque at center of resistance
385 –        Mat3x3d I = integrableObject->getI();
386 –        Vector3d omegaBody;
387 –        
388 –        // What remains contains velocity explicitly, but the velocity required
389 –        // is at the full step: v(t + h), while we have initially the velocity
390 –        // at the half step: v(t + h/2).  We need to iterate to converge the
391 –        // friction force and friction torque vectors.
392 –        
393 –        // this is the velocity at the half-step:
184          
185 <        Vector3d vel =integrableObject->getVel();
186 <        Vector3d angMom = integrableObject->getJ();
397 <        
398 <        //estimate velocity at full-step using everything but friction forces:          
399 <        
400 <        frc = integrableObject->getFrc();
401 <        Vector3d velStep = vel + (dt2_ /mass * OOPSEConstant::energyConvert) * frc;
402 <        
403 <        Tb = integrableObject->lab2Body(integrableObject->getTrq());
404 <        Vector3d angMomStep = angMom + (dt2_ * OOPSEConstant::energyConvert) * Tb;                            
405 <        
406 <        Vector3d omegaLab;
407 <        Vector3d vcdLab;
408 <        Vector3d vcdBody;
409 <        Vector3d frictionForceBody;
410 <        Vector3d frictionForceLab(0.0);
411 <        Vector3d oldFFL;  // used to test for convergence
412 <        Vector3d frictionTorqueBody(0.0);
413 <        Vector3d oldFTB;  // used to test for convergence
414 <        Vector3d frictionTorqueLab;
415 <        RealType fdot;
416 <        RealType tdot;
185 >    veloMunge->removeComDrift();
186 >    veloMunge->removeAngularDrift();
187  
418 –        //iteration starts here:
419 –        
420 –        for (int k = 0; k < maxIterNum_; k++) {
421 –          
422 –          if (integrableObject->isLinear()) {
423 –            int linearAxis = integrableObject->linearAxis();
424 –            int l = (linearAxis +1 )%3;
425 –            int m = (linearAxis +2 )%3;
426 –            omegaBody[l] = angMomStep[l] /I(l, l);
427 –            omegaBody[m] = angMomStep[m] /I(m, m);
428 –            
429 –          } else {
430 –            omegaBody[0] = angMomStep[0] /I(0, 0);
431 –            omegaBody[1] = angMomStep[1] /I(1, 1);
432 –            omegaBody[2] = angMomStep[2] /I(2, 2);
433 –          }
434 –          
435 –          omegaLab = Atrans * omegaBody;
436 –          
437 –          // apply friction force and torque at center of resistance
438 –          
439 –          vcdLab = velStep + cross(omegaLab, rcrLab);      
440 –          vcdBody = A * vcdLab;
441 –          frictionForceBody = -(hydroProps_[index]->getXitt() * vcdBody + hydroProps_[index]->getXirt() * omegaBody);
442 –          oldFFL = frictionForceLab;
443 –          frictionForceLab = Atrans * frictionForceBody;
444 –          oldFTB = frictionTorqueBody;
445 –          frictionTorqueBody = -(hydroProps_[index]->getXitr() * vcdBody + hydroProps_[index]->getXirr() * omegaBody);
446 –          frictionTorqueLab = Atrans * frictionTorqueBody;
447 –          
448 –          // re-estimate velocities at full-step using friction forces:
449 –              
450 –          velStep = vel + (dt2_ / mass * OOPSEConstant::energyConvert) * (frc + frictionForceLab);
451 –          angMomStep = angMom + (dt2_ * OOPSEConstant::energyConvert) * (Tb + frictionTorqueBody);
452 –
453 –          // check for convergence (if the vectors have converged, fdot and tdot will both be 1.0):
454 –              
455 –          fdot = dot(frictionForceLab, oldFFL) / frictionForceLab.lengthSquare();
456 –          tdot = dot(frictionTorqueBody, oldFTB) / frictionTorqueBody.lengthSquare();
457 –          
458 –          if (fabs(1.0 - fdot) <= forceTolerance_ && fabs(1.0 - tdot) <= forceTolerance_)
459 –            break; // iteration ends here
460 –        }
461 –        
462 –        integrableObject->addFrc(frictionForceLab);
463 –        integrableObject->addTrq(frictionTorqueLab + cross(rcrLab, frictionForceLab));
464 –
465 –            
466 –      } else {
467 –        //spherical atom
468 –
469 –        // What remains contains velocity explicitly, but the velocity required
470 –        // is at the full step: v(t + h), while we have initially the velocity
471 –        // at the half step: v(t + h/2).  We need to iterate to converge the
472 –        // friction force vector.
473 –        
474 –        // this is the velocity at the half-step:
475 –        
476 –        Vector3d vel =integrableObject->getVel();
477 –        
478 –        //estimate velocity at full-step using everything but friction forces:          
479 –        
480 –        frc = integrableObject->getFrc();
481 –        Vector3d velStep = vel + (dt2_ / mass * OOPSEConstant::energyConvert) * frc;
482 –        
483 –        Vector3d frictionForce(0.0);
484 –        Vector3d oldFF;  // used to test for convergence
485 –        RealType fdot;
486 –        
487 –        //iteration starts here:
488 –        
489 –        for (int k = 0; k < maxIterNum_; k++) {
490 –          
491 –          oldFF = frictionForce;                            
492 –          frictionForce = -hydroProps_[index]->getXitt() * velStep;
493 –          //frictionForce = -gamma_t*velStep;
494 –          // re-estimate velocities at full-step using friction forces:
495 –          
496 –          velStep = vel + (dt2_ / mass * OOPSEConstant::energyConvert) * (frc + frictionForce);
497 –          
498 –          // check for convergence (if the vector has converged, fdot will be 1.0):
499 –          
500 –          fdot = dot(frictionForce, oldFF) / frictionForce.lengthSquare();
501 –          
502 –          if (fabs(1.0 - fdot) <= forceTolerance_)
503 –            break; // iteration ends here
504 –        }
505 –        
506 –        integrableObject->addFrc(frictionForce);
507 –        
508 –        
509 –      }
510 –  
511 –      
512 –  }
513 –    */
188      Snapshot* currSnapshot = info_->getSnapshotManager()->getCurrentSnapshot();
189      currSnapshot->setVolume(surfaceMesh_->getVolume());    
190      ForceManager::postCalculation(needStress);  
191    }
192  
193 <  void SMIPDForceManager::genRandomForceAndTorque(Vector3d& force, Vector3d& torque, unsigned int index, RealType variance) {
194 <
193 >  
194 >  std::vector<Vector3d> SMIPDForceManager::genTriangleForces(int nTriangles,
195 >                                                             RealType variance)
196 >  {
197      
522 –    Vector<RealType, 6> Z;
523 –    Vector<RealType, 6> generalForce;
524 –    
525 –
526 –    Z[0] = randNumGen_.randNorm(0, variance);
527 –    Z[1] = randNumGen_.randNorm(0, variance);
528 –    Z[2] = randNumGen_.randNorm(0, variance);
529 –    Z[3] = randNumGen_.randNorm(0, variance);
530 –    Z[4] = randNumGen_.randNorm(0, variance);
531 –    Z[5] = randNumGen_.randNorm(0, variance);
532 –    
533 –    generalForce = hydroProps_[index]->getS()*Z;
534 –    
535 –    force[0] = generalForce[0];
536 –    force[1] = generalForce[1];
537 –    force[2] = generalForce[2];
538 –    torque[0] = generalForce[3];
539 –    torque[1] = generalForce[4];
540 –    torque[2] = generalForce[5];
541 –    
542 – }
543 –  std::vector<RealType> SMIPDForceManager::genTriangleForces(int nTriangles, RealType variance) {
544 –
198      // zero fill the random vector before starting:
199 <    std::vector<RealType> gaussRand;
199 >    std::vector<Vector3d> gaussRand;
200      gaussRand.resize(nTriangles);
201 <    std::fill(gaussRand.begin(), gaussRand.end(), 0.0);
202 <
550 <
201 >    std::fill(gaussRand.begin(), gaussRand.end(), V3Zero);
202 >    
203   #ifdef IS_MPI
204      if (worldRank == 0) {
205   #endif
206 +      RealType rx, ry, rz;
207        for (int i = 0; i < nTriangles; i++) {
208 <        //gaussRand[i] = fabs(randNumGen_.randNorm(0.0, 1.0));    
209 <        gaussRand[i] = randNumGen_.randNorm(0.0, 1.0);    
208 >        rx = randNumGen_.randNorm(0.0, variance);
209 >        ry = randNumGen_.randNorm(0.0, variance);
210 >        rz = randNumGen_.randNorm(0.0, variance);
211 >        gaussRand[i][0] = rx;
212 >        gaussRand[i][1] = ry;
213 >        gaussRand[i][2] = rz;
214        }
215   #ifdef IS_MPI
216      }
217   #endif
218 <
218 >    
219      // push these out to the other processors
220 <
220 >    
221   #ifdef IS_MPI
222      if (worldRank == 0) {
223 <      MPI_Bcast(&gaussRand[0], nTriangles, MPI_REAL, 0, MPI_COMM_WORLD);
223 >      MPI_Bcast(&gaussRand[0], nTriangles*3 , MPI_REALTYPE, 0, MPI_COMM_WORLD);
224      } else {
225 <      MPI_Bcast(&gaussRand[0], nTriangles, MPI_REAL, 0, MPI_COMM_WORLD);
225 >      MPI_Bcast(&gaussRand[0], nTriangles*3, MPI_REALTYPE, 0, MPI_COMM_WORLD);
226      }
227   #endif
228 <  
572 <    for (int i = 0; i < nTriangles; i++) {
573 <      gaussRand[i] = gaussRand[i] * variance;
574 <    }
575 <  
228 >    
229      return gaussRand;
230    }
578 –
579 –
580 –
581 –
582 –
231   }

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