Cantera  2.5.1
Public Member Functions | Protected Attributes | List of all members
ResidJacEval Class Reference

Wrappers for the function evaluators for Nonlinear solvers and Time steppers. More...

#include <ResidJacEval.h>

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Public Member Functions

 ResidJacEval (doublereal atol=1.0e-13)
 Default constructor. More...
 
virtual int nEquations () const
 Return the number of equations in the equation system. More...
 
virtual int evalResidNJ (const doublereal t, const doublereal delta_t, const doublereal *const y, const doublereal *const ydot, doublereal *const resid, const ResidEval_Type_Enum evalType=Base_ResidEval, const int id_x=-1, const doublereal delta_x=0.0)
 Evaluate the residual function. More...
 
virtual int eval (const doublereal t, const doublereal *const y, const doublereal *const ydot, doublereal *const r)
 Evaluate the residual function. More...
 
virtual int getInitialConditions (const doublereal t0, doublereal *const y, doublereal *const ydot)
 Fill in the initial conditions. More...
 
virtual doublereal filterNewStep (const doublereal t, const doublereal *const ybase, doublereal *const step)
 Filter the solution predictions. More...
 
virtual doublereal filterSolnPrediction (const doublereal t, doublereal *const y)
 Filter the solution predictions. More...
 
void setAtol (doublereal atol)
 Set a global value of the absolute tolerance. More...
 
virtual int evalTimeTrackingEqns (const doublereal t, const doublereal delta_t, const doublereal *const y, const doublereal *const ydot)
 Evaluate the time tracking equations, if any. More...
 
virtual bool evalStoppingCritera (const doublereal t, const doublereal delta_t, const doublereal *const y, const doublereal *const ydot)
 Evaluate any stopping criteria other than a final time limit. More...
 
virtual int calcDeltaSolnVariables (const doublereal t, const doublereal *const y, const doublereal *const ydot, doublereal *const delta_y, const doublereal *const solnWeights=0)
 Return a vector of delta y's for calculation of the numerical Jacobian. More...
 
virtual void calcSolnScales (const doublereal t, const doublereal *const y, const doublereal *const y_old, doublereal *const yScales)
 Returns a vector of column scale factors that can be used to column scale Jacobians. More...
 
virtual void user_out2 (const int ifunc, const doublereal t, const doublereal delta_t, const doublereal *const y, const doublereal *const ydot)
 This function may be used to create output at various points in the execution of an application. More...
 
virtual void user_out (const int ifunc, const doublereal t, const doublereal *y, const doublereal *ydot)
 This function may be used to create output at various points in the execution of an application. More...
 
virtual int matrixConditioning (doublereal *const matrix, const int nrows, doublereal *const rhs)
 Multiply the matrix by another matrix that leads to better conditioning. More...
 
virtual int evalJacobian (const doublereal t, const doublereal delta_t, doublereal cj, const doublereal *const y, const doublereal *const ydot, DenseMatrix &J, doublereal *const resid)
 Calculate an analytical Jacobian and the residual at the current time and values. More...
 
virtual int evalJacobianDP (const doublereal t, const doublereal delta_t, doublereal cj, const doublereal *const y, const doublereal *const ydot, doublereal *const *jacobianColPts, doublereal *const resid)
 Calculate an analytical Jacobian and the residual at the current time and values. More...
 
- Public Member Functions inherited from ResidEval
virtual void constrain (const int k, const int flag)
 Constrain solution component k. More...
 
int constraint (const int k) const
 
virtual void initSizes ()
 Initialization function. More...
 
virtual void setAlgebraic (const int k)
 Specify that solution component k is purely algebraic - that is, the derivative of this component does not appear in the residual function. More...
 
virtual bool isAlgebraic (const int k)
 
virtual int evalSS (const doublereal t, const doublereal *const y, doublereal *const r)
 
virtual int evalSimpleTD (const doublereal t, const doublereal *const y, const doublereal *const yold, doublereal deltaT, doublereal *const r)
 
virtual void writeSolution (int ievent, const double time, const double deltaT, const int time_step_num, const double *y, const double *ydot)
 Write out to a file or to standard output the current solution. More...
 
int nparams () const
 Return the number of parameters in the calculation. More...
 

Protected Attributes

doublereal m_atol
 constant value of atol More...
 
int neq_
 Number of equations. More...
 
- Protected Attributes inherited from ResidEval
vector_int m_alg
 Mapping vector that stores whether a degree of freedom is a DAE or not. More...
 
std::map< int, int > m_constrain
 

Detailed Description

Wrappers for the function evaluators for Nonlinear solvers and Time steppers.

Attention
This class currently does not have any test cases or examples. Its implementation may be incomplete, and future changes to Cantera may unexpectedly cause this class to stop working. If you use this class, please consider contributing examples or test cases. In the absence of new tests or examples, this class may be deprecated and removed in a future version of Cantera. See https://github.com/Cantera/cantera/issues/267 for additional information.

A class for full (non-sparse dense matrices with Fortran-compatible data storage. The class adds support for identifying what types of calls are made to the residual evaluator by adding the ResidEval_Type_Enum class.

Definition at line 55 of file ResidJacEval.h.

Constructor & Destructor Documentation

◆ ResidJacEval()

ResidJacEval ( doublereal  atol = 1.0e-13)

Default constructor.

Parameters
atolInitial value of the global tolerance (defaults to 1.0E-13)

Definition at line 13 of file ResidJacEval.cpp.

Member Function Documentation

◆ nEquations()

int nEquations ( ) const
virtual

Return the number of equations in the equation system.

Implements ResidEval.

Definition at line 18 of file ResidJacEval.cpp.

References ResidJacEval::neq_.

Referenced by DAE_Solver::nEquations().

◆ evalResidNJ()

int evalResidNJ ( const doublereal  t,
const doublereal  delta_t,
const doublereal *const  y,
const doublereal *const  ydot,
doublereal *const  resid,
const ResidEval_Type_Enum  evalType = Base_ResidEval,
const int  id_x = -1,
const doublereal  delta_x = 0.0 
)
virtual

Evaluate the residual function.

Parameters
tTime (input)
delta_tThe current value of the time step (input)
ySolution vector (input, do not modify)
ydotRate of change of solution vector. (input, do not modify)
residValue of the residual that is computed (output)
evalTypeType of the residual being computed (defaults to Base_ResidEval)
id_xIndex of the variable that is being numerically differenced to find the Jacobian (defaults to -1, which indicates that no variable is being differenced or that the residual doesn't take this issue into account)
delta_xValue of the delta used in the numerical differencing
Returns
a flag to indicate that operation is successful. 1 Means a successful operation -0 or neg value Means an unsuccessful operation

Definition at line 120 of file ResidJacEval.cpp.

Referenced by ResidJacEval::eval(), and ida_resid().

◆ eval()

int eval ( const doublereal  t,
const doublereal *const  y,
const doublereal *const  ydot,
doublereal *const  r 
)
virtual

Evaluate the residual function.

Called by the integrator.

Parameters
ttime. (input)
ysolution vector. (input)
ydotrate of change of solution vector. (input)
rresidual vector (output)

Reimplemented from ResidEval.

Definition at line 129 of file ResidJacEval.cpp.

References ResidJacEval::evalResidNJ().

◆ getInitialConditions()

int getInitialConditions ( const doublereal  t0,
doublereal *const  y,
doublereal *const  ydot 
)
virtual

Fill in the initial conditions.

Values for both the solution and the value of ydot may be provided.

Parameters
[in]t0Time
[out]ySolution vector
[out]ydotRate of change of solution vector.
Returns
a flag to indicate that operation is successful. 1 Means a successful operation -0 or neg value Means an unsuccessful operation

Reimplemented from ResidEval.

Definition at line 32 of file ResidJacEval.cpp.

References ResidJacEval::neq_.

Referenced by IDA_Solver::init().

◆ filterNewStep()

doublereal filterNewStep ( const doublereal  t,
const doublereal *const  ybase,
doublereal *const  step 
)
virtual

Filter the solution predictions.

Codes might provide a predicted step change. This routine filters the predicted solution vector eliminating illegal directions.

Parameters
tTime (input)
ybaseSolution vector (input, output)
stepProposed step in the solution that will be cropped
Returns
the norm of the amount of filtering

Definition at line 96 of file ResidJacEval.cpp.

◆ filterSolnPrediction()

doublereal filterSolnPrediction ( const doublereal  t,
doublereal *const  y 
)
virtual

Filter the solution predictions.

Codes might provide a predicted solution vector. This routine filters the predicted solution vector.

Parameters
tTime (input)
ySolution vector (input, output)
Returns
the norm of the amount of filtering

Definition at line 101 of file ResidJacEval.cpp.

◆ setAtol()

void setAtol ( doublereal  atol)

Set a global value of the absolute tolerance.

Parameters
atolValue of atol

Definition at line 23 of file ResidJacEval.cpp.

References ResidJacEval::m_atol.

◆ evalTimeTrackingEqns()

int evalTimeTrackingEqns ( const doublereal  t,
const doublereal  delta_t,
const doublereal *const  y,
const doublereal *const  ydot 
)
virtual

Evaluate the time tracking equations, if any.

Evaluate time integrated quantities that are calculated at the end of every successful time step. This call is made once at the end of every successful time step that advances the time. It's also made once at the start of the time stepping.

Parameters
tTime (input)
delta_tThe current value of the time step (input)
ySolution vector (input, do not modify)
ydotRate of change of solution vector. (input, do not modify)
Returns
a flag to indicate that operation is successful. 1 Means a successful operation -0 or neg value Means an unsuccessful operation

Definition at line 58 of file ResidJacEval.cpp.

◆ evalStoppingCritera()

bool evalStoppingCritera ( const doublereal  t,
const doublereal  delta_t,
const doublereal *const  y,
const doublereal *const  ydot 
)
virtual

Evaluate any stopping criteria other than a final time limit.

If we are to stop the time integration for any reason other than reaching a final time limit, tout, provide a test here. This call is made at the end of every successful time step iteration

Returns
If true, the the time stepping is stopped. If false, then time stepping is stopped if t >= tout Defaults to false.
Parameters
tTime (input)
delta_tThe current value of the time step (input)
ySolution vector (input, do not modify)
ydotRate of change of solution vector. (input, do not modify)

Definition at line 106 of file ResidJacEval.cpp.

◆ calcDeltaSolnVariables()

int calcDeltaSolnVariables ( const doublereal  t,
const doublereal *const  y,
const doublereal *const  ydot,
doublereal *const  delta_y,
const doublereal *const  solnWeights = 0 
)
virtual

Return a vector of delta y's for calculation of the numerical Jacobian.

There is a default algorithm provided.

delta_y[i] = atol[i] + 1.0E-6 ysoln[i]
delta_y[i] = atol[i] + MAX(1.0E-6 ysoln[i] * 0.01 * solnWeights[i])
Parameters
tTime (input)
ySolution vector (input, do not modify)
ydotRate of change of solution vector. (input, do not modify)
delta_yValue of the delta to be used in calculating the numerical Jacobian
solnWeightsValue of the solution weights that are used in determining convergence (default = 0)
Returns
a flag to indicate that operation is successful. 1 Means a successful operation -0 or neg value Means an unsuccessful operation

Definition at line 66 of file ResidJacEval.cpp.

References ResidJacEval::m_atol, and ResidJacEval::neq_.

◆ calcSolnScales()

void calcSolnScales ( const doublereal  t,
const doublereal *const  y,
const doublereal *const  y_old,
doublereal *const  yScales 
)
virtual

Returns a vector of column scale factors that can be used to column scale Jacobians.

Default to yScales[] = 1.0

Parameters
tTime (input)
ySolution vector (input, do not modify)
y_oldOld Solution vector (input, do not modify)
yScalesValue of the column scales

Definition at line 84 of file ResidJacEval.cpp.

References ResidJacEval::neq_.

◆ user_out2()

void user_out2 ( const int  ifunc,
const doublereal  t,
const doublereal  delta_t,
const doublereal *const  y,
const doublereal *const  ydot 
)
virtual

This function may be used to create output at various points in the execution of an application.

Parameters
ifuncidentity of the call 0 Initial call 1 Called at the end of every successful time step -1 Called at the end of every unsuccessful time step 2 Called at the end of every call to integrateRJE()
tTime (input)
delta_tThe current value of the time step (input)
ySolution vector (input, do not modify)
ydotRate of change of solution vector. (input)

Definition at line 46 of file ResidJacEval.cpp.

Referenced by ResidJacEval::user_out().

◆ user_out()

void user_out ( const int  ifunc,
const doublereal  t,
const doublereal *  y,
const doublereal *  ydot 
)
virtual

This function may be used to create output at various points in the execution of an application.

This routine calls user_out2().

Parameters
ifuncidentity of the call
tTime (input)
ySolution vector (input, do not modify)
ydotRate of change of solution vector. (input)

Definition at line 52 of file ResidJacEval.cpp.

References ResidJacEval::user_out2().

◆ matrixConditioning()

int matrixConditioning ( doublereal *const  matrix,
const int  nrows,
doublereal *const  rhs 
)
virtual

Multiply the matrix by another matrix that leads to better conditioning.

Provide a left sided matrix that will multiply the current Jacobian, after scaling and lead to a better conditioned system. This routine is called just before the matrix is factored.

Original Problem: J delta_x = - Resid

New problem: M (J delta_x) = - M Resid

Parameters
matrixPointer to the current Jacobian (if zero, it's already been factored)
nrowsoffsets for the matrix
rhsresidual vector. This also needs to be LHS multiplied by M
Returns
a flag to indicate that operation is successful. 1 Means a successful operation -0 or neg value Means an unsuccessful operation

Definition at line 114 of file ResidJacEval.cpp.

◆ evalJacobian()

int evalJacobian ( const doublereal  t,
const doublereal  delta_t,
doublereal  cj,
const doublereal *const  y,
const doublereal *const  ydot,
DenseMatrix J,
doublereal *const  resid 
)
virtual

Calculate an analytical Jacobian and the residual at the current time and values.

Only called if the jacFormation method is set to analytical

Parameters
tTime (input)
delta_tThe current value of the time step (input)
cjCoefficient of yprime used in the evaluation of the Jacobian
ySolution vector (input, do not modify)
ydotRate of change of solution vector. (input, do not modify)
JReference to the DenseMatrix object to be calculated (output)
residValue of the residual that is computed (output)
Returns
a flag to indicate that operation is successful. 1 Means a successful operation -0 or neg value Means an unsuccessful operation

Definition at line 136 of file ResidJacEval.cpp.

References ResidJacEval::evalJacobianDP().

◆ evalJacobianDP()

int evalJacobianDP ( const doublereal  t,
const doublereal  delta_t,
doublereal  cj,
const doublereal *const  y,
const doublereal *const  ydot,
doublereal *const *  jacobianColPts,
doublereal *const  resid 
)
virtual

Calculate an analytical Jacobian and the residual at the current time and values.

Only called if the jacFormation method is set to analytical

Parameters
tTime (input)
delta_tThe current value of the time step (input)
cjCoefficient of yprime used in the evaluation of the Jacobian
ySolution vector (input, do not modify)
ydotRate of change of solution vector. (input, do not modify)
jacobianColPtsPointer to the vector of pts to columns of the DenseMatrix object to be calculated (output)
residValue of the residual that is computed (output)
Returns
a flag to indicate that operation is successful. 1 Means a successful operation -0 or neg value Means an unsuccessful operation

Definition at line 145 of file ResidJacEval.cpp.

Referenced by ResidJacEval::evalJacobian(), and ida_jacobian().

Member Data Documentation

◆ m_atol

doublereal m_atol
protected

constant value of atol

Definition at line 298 of file ResidJacEval.h.

Referenced by ResidJacEval::calcDeltaSolnVariables(), and ResidJacEval::setAtol().

◆ neq_

int neq_
protected

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