| 1 |
< |
/* |
| 1 |
> |
/* |
| 2 |
|
* Copyright (c) 2005 The University of Notre Dame. All Rights Reserved. |
| 3 |
|
* |
| 4 |
|
* The University of Notre Dame grants you ("Licensee") a |
| 6 |
|
* redistribute this software in source and binary code form, provided |
| 7 |
|
* that the following conditions are met: |
| 8 |
|
* |
| 9 |
< |
* 1. Acknowledgement of the program authors must be made in any |
| 10 |
< |
* publication of scientific results based in part on use of the |
| 11 |
< |
* program. An acceptable form of acknowledgement is citation of |
| 12 |
< |
* the article in which the program was described (Matthew |
| 13 |
< |
* A. Meineke, Charles F. Vardeman II, Teng Lin, Christopher |
| 14 |
< |
* J. Fennell and J. Daniel Gezelter, "OOPSE: An Object-Oriented |
| 15 |
< |
* Parallel Simulation Engine for Molecular Dynamics," |
| 16 |
< |
* J. Comput. Chem. 26, pp. 252-271 (2005)) |
| 17 |
< |
* |
| 18 |
< |
* 2. Redistributions of source code must retain the above copyright |
| 9 |
> |
* 1. Redistributions of source code must retain the above copyright |
| 10 |
|
* notice, this list of conditions and the following disclaimer. |
| 11 |
|
* |
| 12 |
< |
* 3. Redistributions in binary form must reproduce the above copyright |
| 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. |
| 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] Vardeman & Gezelter, in progress (2009). |
| 40 |
|
*/ |
| 41 |
|
|
| 42 |
|
#include "primitives/GhostBend.hpp" |
| 43 |
|
#include "primitives/DirectionalAtom.hpp" |
| 44 |
< |
namespace oopse { |
| 44 |
> |
namespace OpenMD { |
| 45 |
|
|
| 46 |
< |
/**@todo still a lot left to improve*/ |
| 47 |
< |
void GhostBend::calcForce() { |
| 46 |
> |
/**@todo still a lot left to improve*/ |
| 47 |
> |
void GhostBend::calcForce(RealType& angle) { |
| 48 |
|
DirectionalAtom* ghostAtom = static_cast<DirectionalAtom*>(atom2_); |
| 49 |
|
|
| 50 |
|
Vector3d pos1 = atom1_->getPos(); |
| 51 |
|
Vector3d pos2 = ghostAtom->getPos(); |
| 52 |
|
|
| 53 |
< |
Vector3d r12 = pos1 - pos2; |
| 54 |
< |
double d12 = r12.length(); |
| 53 |
> |
Vector3d r21 = pos1 - pos2; |
| 54 |
> |
RealType d21 = r21.length(); |
| 55 |
> |
|
| 56 |
> |
RealType d21inv = 1.0 / d21; |
| 57 |
> |
|
| 58 |
> |
// we need the transpose of A to get the lab fixed vector: |
| 59 |
> |
Vector3d r23 = ghostAtom->getA().transpose().getColumn(2); |
| 60 |
> |
RealType d23 = r23.length(); |
| 61 |
> |
|
| 62 |
> |
RealType d23inv = 1.0 / d23; |
| 63 |
> |
|
| 64 |
> |
RealType cosTheta = dot(r21, r23) / (d21 * d23); |
| 65 |
|
|
| 56 |
– |
double d12inv = 1.0 / d12; |
| 57 |
– |
|
| 58 |
– |
Vector3d r32 = ghostAtom->getElectroFrame().getColumn(2); |
| 59 |
– |
double d32 = r32.length(); |
| 60 |
– |
|
| 61 |
– |
double d32inv = 1.0 / d32; |
| 62 |
– |
|
| 63 |
– |
double cosTheta = dot(r12, r32) / (d12 * d32); |
| 64 |
– |
|
| 66 |
|
//check roundoff |
| 67 |
|
if (cosTheta > 1.0) { |
| 68 |
< |
cosTheta = 1.0; |
| 68 |
> |
cosTheta = 1.0; |
| 69 |
|
} else if (cosTheta < -1.0) { |
| 70 |
< |
cosTheta = -1.0; |
| 70 |
> |
cosTheta = -1.0; |
| 71 |
|
} |
| 72 |
+ |
|
| 73 |
+ |
RealType theta = acos(cosTheta); |
| 74 |
|
|
| 75 |
< |
double theta = acos(cosTheta); |
| 76 |
< |
|
| 77 |
< |
double firstDerivative; |
| 78 |
< |
|
| 79 |
< |
bendType_->calcForce(theta, firstDerivative, potential_); |
| 80 |
< |
|
| 81 |
< |
double sinTheta = sqrt(1.0 - cosTheta * cosTheta); |
| 82 |
< |
|
| 80 |
< |
if (fabs(sinTheta) < 1.0E-12) { |
| 81 |
< |
sinTheta = 1.0E-12; |
| 75 |
> |
RealType dVdTheta; |
| 76 |
> |
|
| 77 |
> |
bendType_->calcForce(theta, potential_, dVdTheta); |
| 78 |
> |
|
| 79 |
> |
RealType sinTheta = sqrt(1.0 - cosTheta * cosTheta); |
| 80 |
> |
|
| 81 |
> |
if (fabs(sinTheta) < 1.0E-6) { |
| 82 |
> |
sinTheta = 1.0E-6; |
| 83 |
|
} |
| 84 |
+ |
|
| 85 |
+ |
RealType commonFactor1 = dVdTheta / sinTheta * d21inv; |
| 86 |
+ |
RealType commonFactor2 = dVdTheta / sinTheta * d23inv; |
| 87 |
+ |
|
| 88 |
+ |
Vector3d force1 = commonFactor1 * (r23 * d23inv - r21*d21inv*cosTheta); |
| 89 |
+ |
Vector3d force3 = commonFactor2 * (r21 * d21inv - r23*d23inv*cosTheta); |
| 90 |
|
|
| 91 |
< |
double commonFactor1 = -firstDerivative / sinTheta * d12inv; |
| 85 |
< |
double commonFactor2 = -firstDerivative / sinTheta * d32inv; |
| 91 |
> |
// Total force in current bend is zero |
| 92 |
|
|
| 87 |
– |
Vector3d force1 = commonFactor1*(r12*(d12inv*cosTheta) - r32*d32inv); |
| 88 |
– |
Vector3d force3 = commonFactor2*(r32*(d32inv*cosTheta) - r12*d12inv); |
| 93 |
|
atom1_->addFrc(force1); |
| 94 |
|
ghostAtom->addFrc(-force1); |
| 91 |
– |
/**@todo test correctness */ |
| 92 |
– |
ghostAtom->addTrq(cross(r32, force3) ); |
| 95 |
|
|
| 96 |
< |
} |
| 96 |
> |
ghostAtom->addTrq( cross(r23, force3) ); |
| 97 |
|
|
| 98 |
< |
} //end namespace oopse |
| 98 |
> |
atom1_->addParticlePot(potential_); |
| 99 |
> |
ghostAtom->addParticlePot(potential_); |
| 100 |
|
|
| 101 |
+ |
angle = theta /M_PI * 180.0; |
| 102 |
+ |
|
| 103 |
+ |
} |
| 104 |
+ |
} //end namespace OpenMD |
| 105 |
+ |
|
