IMP  2.2.1
The Integrative Modeling Platform
IMP::atom::BerendsenThermostatOptimizerState Class Reference

Maintains temperature during molecular dynamics. More...

#include <IMP/atom/BerendsenThermostatOptimizerState.h>

+ Inheritance diagram for IMP::atom::BerendsenThermostatOptimizerState:

Public Member Functions

 BerendsenThermostatOptimizerState (const kernel::Particles &pis, double temperature, double tau)
 
double get_tau ()
 
double get_temperature ()
 
virtual std::string get_type_name () const
 
virtual ::IMP::base::VersionInfo get_version_info () const
 Get information about the module and version of the object.
 
void rescale_velocities () const
 Rescale the velocities now.
 
void set_particles (const kernel::Particles &pis)
 Set the particles to use.
 
void set_tau (double tau)
 
void set_temperature (double temperature)
 
- Public Member Functions inherited from IMP::kernel::OptimizerState
 OptimizerState (kernel::Model *m, std::string name)
 
unsigned int get_number_of_updates () const
 Return the number of times update has been called.
 
Optimizerget_optimizer () const
 
unsigned int get_period () const
 
virtual void reset ()
 
virtual void set_is_optimizing (bool)
 
void set_number_of_updates (unsigned int n)
 Set the counter.
 
void set_period (unsigned int p)
 
virtual void update ()
 Called when the Optimizer accepts a new conformation. More...
 
void update_always ()
 
- Public Member Functions inherited from IMP::kernel::ModelObject
 ModelObject (kernel::Model *m, std::string name)
 
bool get_has_dependencies () const
 Return whether this object has dependencies computed.
 
bool get_has_required_score_states () const
 
ModelObjectsTemp get_inputs () const
 
ModelObjectsTemps get_interactions () const
 
Modelget_model () const
 
ModelObjectsTemp get_outputs () const
 
const ScoreStatesTempget_required_score_states () const
 
void set_has_dependencies (bool tf)
 
void set_has_required_score_states (bool tf)
 
- Public Member Functions inherited from IMP::base::Object
virtual void clear_caches ()
 
virtual void do_destroy ()
 
CheckLevel get_check_level () const
 
LogLevel get_log_level () const
 
void set_check_level (CheckLevel l)
 
void set_log_level (LogLevel l)
 Set the logging level used in this object. More...
 
void set_was_used (bool tf) const
 
void show (std::ostream &out=std::cout) const
 
const std::string & get_name () const
 
void set_name (std::string name)
 

Protected Member Functions

virtual void do_update (unsigned int)
 
- Protected Member Functions inherited from IMP::kernel::OptimizerState
virtual ModelObjectsTemp do_get_inputs () const
 
virtual ModelObjectsTemp do_get_outputs () const
 
virtual void do_set_is_optimizing (bool)
 
- Protected Member Functions inherited from IMP::kernel::ModelObject
virtual ModelObjectsTemps do_get_interactions () const
 
virtual void handle_set_has_required_score_states (bool)
 
- Protected Member Functions inherited from IMP::base::Object
 Object (std::string name)
 Construct an object with the given name. More...
 

Detailed Description

The thermostat scales velocities using the algorithm described in H. J. C. Berendsen, J. P. M. Postma, W. F. van Gunsteren, A. DiNola, and J. R. Haak "Molecular dynamics with coupling to an external bath", Journal of Chemical Physics 81 pp. 3684-3690 (1984).

At each update, velocities are rescaled by

\[ \lambda = \left[1 + \frac{\Delta t}{\tau_T} \left( \frac{T}{T_k} -1\right)\right]^{1/2} \]

where \(\Delta t\) is the molecular dynamics timestep, \(\tau_T\) is the coupling constant (in fs) of the thermostat, \(T\) is the thermostat temperature, and \(T_k\) is the instantaneous (kinetic) temperature of the dynamics. (This is equation 11 from the reference above.)

Definition at line 36 of file BerendsenThermostatOptimizerState.h.

Member Function Documentation

virtual void IMP::atom::BerendsenThermostatOptimizerState::do_update ( unsigned int  )
protectedvirtual

This method is called every get_period() update calls. The number of times this method has been called since the last reset or start of the optimization run is passed.

Reimplemented from IMP::kernel::OptimizerState.


The documentation for this class was generated from the following file: