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lammps/lib/atc/TimeIntegrator.h
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TimeIntegrator.h
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#ifndef TIME_INTEGRATOR_H
#define TIME_INTEGRATOR_H
// ATC_Transfer headers
#include "MatrixLibrary.h"
#include "TimeFilter.h"
#include "ATC_TypeDefs.h"
using namespace std;
namespace ATC {
// forward declarations
class ATC_Transfer;
class TimeIntegrationMethod;
/**
* @class TimeIntegrator
* @brief Base class fo various time integrators for FE quantities
*/
//--------------------------------------------------------
//--------------------------------------------------------
// Class TimeIntegrator
//--------------------------------------------------------
//--------------------------------------------------------
class TimeIntegrator {
public:
/** types of time integration */
enum TimeIntegrationType {
STEADY,
VERLET,
GEAR,
FRACTIONAL_STEP,
EXPLICIT,
IMPLICIT,
CRANK_NICOLSON
};
// constructor
TimeIntegrator(ATC_Transfer * atcTransfer,
TimeIntegrationType timeIntegrationType = STEADY);
// destructor
virtual ~TimeIntegrator();
/** parser/modifier */
virtual bool modify(int narg, char **arg){return false;};
/** pre time integration */
virtual void initialize(){needReset_ = false;};
/** flag if reset is needed */
bool need_reset() {return needReset_;};
// time step methods, corresponding to ATC_Transfer
/** first part of pre_initial_integrate */
virtual void pre_initial_integrate1(double dt);
/** second part of pre_initial_integrate */
virtual void pre_initial_integrate2(double dt);
/** first part of mid_initial_integrate */
virtual void mid_initial_integrate1(double dt);
/** second part of mid_initial_integrate */
virtual void mid_initial_integrate2(double dt);
/** first part of post_initial_integrate */
virtual void post_initial_integrate1(double dt);
/** second part of post_initial_integrate */
virtual void post_initial_integrate2(double dt);
/** first part of pre_final_integrate */
virtual void pre_final_integrate1(double dt);
/** second part of pre_final_integrate */
virtual void pre_final_integrate2(double dt);
/** first part of post_final_integrate */
virtual void post_final_integrate1(double dt);
/** second part of post_final_integrate */
virtual void post_final_integrate2(double dt);
/** post processing step */
virtual void post_process(double dt);
/** add output data */
virtual void output(OUTPUT_LIST & outputData);
// Member data access
/** access to time integration type */
TimeIntegrationType get_time_integration_type() const
{ return timeIntegrationType_; };
/** access to ATC Transfer object */
ATC_Transfer * get_atc_transfer() {return atcTransfer_;};
/** access to time filter object */
TimeFilter * get_time_filter() {return timeFilter_;};
/** access to time filter manager object */
TimeFilterManager * get_time_filter_manager() {return timeFilterManager_;};
/** force the integrator to be reset */
void force_reset() {needReset_ = true;};
/** force the integrator not to be reset */
void force_no_reset() {needReset_ = false;};
protected:
/** pointer to time integrator method */
TimeIntegrationMethod * timeIntegrationMethod_;
/** pointer to access ATC methods */
ATC_Transfer * atcTransfer_;
/** time filter for specific updates */
TimeFilter * timeFilter_;
/** time filter manager for getting time filtering info */
TimeFilterManager * timeFilterManager_;
/** type of integration scheme being used */
TimeIntegrationType timeIntegrationType_;
/** flat to reset data */
bool needReset_;
private:
// DO NOT define this
TimeIntegrator();
};
/**
* @class TimeIntegrationMethod
* @brief Base class fo various time integration methods
*/
//--------------------------------------------------------
//--------------------------------------------------------
// Class TimeIntegrationMethod
// Base class for time integration methods which
// update the FE quantities
//--------------------------------------------------------
//--------------------------------------------------------
class TimeIntegrationMethod {
public:
// constructor
TimeIntegrationMethod(TimeIntegrator * timeIntegrator);
// destructor
virtual ~TimeIntegrationMethod(){};
// time step methods, corresponding to ATC_Transfer and TimeIntegrator
/** first part of pre_initial_integrate */
virtual void pre_initial_integrate1(double dt){};
/** second part of pre_initial_integrate */
virtual void pre_initial_integrate2(double dt){};
/** first part of mid_initial_integrate */
virtual void mid_initial_integrate1(double dt){};
/** second part of mid_initial_integrate */
virtual void mid_initial_integrate2(double dt){};
/** first part of post_initial_integrate */
virtual void post_initial_integrate1(double dt){};
/** second part of post_initial_integrate */
virtual void post_initial_integrate2(double dt){};
/** first part of pre_final_integrate */
virtual void pre_final_integrate1(double dt){};
/** second part of pre_final_integrate */
virtual void pre_final_integrate2(double dt){};
/** first part of post_final_integrate */
virtual void post_final_integrate1(double dt){};
/** second part of post_final_integrate */
virtual void post_final_integrate2(double dt){};
/** post processing step */
virtual void post_process(double dt){};
/** add output data */
virtual void output(OUTPUT_LIST & outputData){};
protected:
/** owning time integrator */
TimeIntegrator * timeIntegrator_;
/** associated ATC transfer object */
ATC_Transfer * atcTransfer_;
private:
// DO NOT define this
TimeIntegrationMethod();
};
//--------------------------------------------------------
//--------------------------------------------------------
// time integration functions not associated
// with any particular class
//--------------------------------------------------------
//--------------------------------------------------------
static void gear1_4_predict(MATRIX & f,
MATRIX & dot_f,
MATRIX & ddot_f,
MATRIX & dddot_f,
double dt)
// 4th order Gear integrator for 1rst order ODE predictor step
{
f = f + dot_f*dt + ddot_f*(1./2.*dt*dt) + dddot_f*(1./6.*dt*dt*dt);
dot_f = dot_f + ddot_f*dt+dddot_f*(1./2.*dt*dt);
ddot_f = ddot_f + dddot_f*dt;
};
static void gear1_3_predict(MATRIX & f,
MATRIX & dot_f,
MATRIX & ddot_f,
double dt)
// 3rd order Gear integrator for 1rst order ODE predictor step
{
f = f + dot_f*dt + ddot_f*(1./2.*dt*dt);
dot_f = dot_f + ddot_f*dt;
};
static void gear1_4_correct(MATRIX & f,
MATRIX & dot_f,
MATRIX & ddot_f,
MATRIX & dddot_f,
const MATRIX & R_f,
double dt)
// 4th order Gear integrator for 1rst order ODE corrector step
{
f = f + (3./8.)*R_f;
dot_f = dot_f + (1./dt)*R_f;
ddot_f = ddot_f + (3./2./dt/dt)*R_f;
dddot_f = dddot_f + (1./dt/dt/dt)*R_f;
};
static void gear1_3_correct(MATRIX & f,
MATRIX & dot_f,
MATRIX & ddot_f,
const MATRIX & R_f,
double dt)
// 3rd order Gear integrator for 1rst order ODE corrector step
{
f = f + (5./12.)*R_f;
dot_f = dot_f + (1./dt)*R_f;
ddot_f = ddot_f + (1./dt/dt)*R_f;
};
static void explicit_1(MATRIX & f,
MATRIX & dot_f,
double dt)
// 1rst order explict ODE update
{
f = f + dt*dot_f;
};
static void explicit_2(MATRIX & f,
MATRIX & dot_f,
MATRIX & ddot_f,
double dt)
// 2nd order explict ODE update
{
f = f + dt*dot_f + .5*dt*dt*ddot_f;
};
};
#endif
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