Public Member Functions | List of all members
EulerSI Class Reference

Semi-implicit Euler ODE solver of order (0)1. More...

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Public Member Functions

 TypeName ("EulerSI")
 Runtime type information. More...
 
 EulerSI (const ODESystem &ode, const dictionary &dict)
 Construct from ODESystem. More...
 
virtual ~EulerSI ()
 Destructor. More...
 
virtual bool resize ()
 Resize the ODE solver. More...
 
virtual scalar solve (const scalar x0, const scalarField &y0, const scalarField &dydx0, const scalar dx, scalarField &y) const
 Solve a single step dx and return the error. More...
 
virtual void solve (scalar &x, scalarField &y, scalar &dxTry) const
 Solve the ODE system and the update the state. More...
 
- Public Member Functions inherited from ODESolver
 TypeName ("ODESolver")
 Runtime type information. More...
 
 declareRunTimeSelectionTable (autoPtr, ODESolver, dictionary,(const ODESystem &ode, const dictionary &dict),(ode, dict))
 
 ODESolver (const ODESystem &ode, const dictionary &dict)
 Construct for given ODESystem. More...
 
 ODESolver (const ODESystem &ode, const scalarField &absTol, const scalarField &relTol)
 Construct for given ODESystem specifying tolerances. More...
 
virtual ~ODESolver ()
 Destructor. More...
 
label nEqns () const
 Return the number of equations to solve. More...
 
scalarFieldabsTol ()
 Return access to the absolute tolerance field. More...
 
scalarFieldrelTol ()
 Return access to the relative tolerance field. More...
 
template<class Type >
void resizeField (UList< Type > &f) const
 
void resizeMatrix (scalarSquareMatrix &m) const
 
virtual void solve (scalar &x, scalarField &y, stepState &step) const
 Solve the ODE system as far as possible up to dxTry. More...
 
virtual void solve (const scalar xStart, const scalar xEnd, scalarField &y, scalar &dxEst) const
 Solve the ODE system from xStart to xEnd, update the state. More...
 
- Public Member Functions inherited from adaptiveSolver
 adaptiveSolver (const ODESystem &ode, const dictionary &dict)
 Construct from ODESystem. More...
 
virtual ~adaptiveSolver ()
 Destructor. More...
 
bool resize (const label n)
 Resize the ODE solver. More...
 
void solve (const ODESystem &ode, scalar &x, scalarField &y, scalar &dxTry) const
 Solve the ODE system and the update the state. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from ODESolver
static autoPtr< ODESolverNew (const ODESystem &ode, const dictionary &dict)
 Select null constructed. More...
 
template<class Type >
static void resizeField (UList< Type > &f, const label n)
 
- Protected Member Functions inherited from ODESolver
scalar normalizeError (const scalarField &y0, const scalarField &y, const scalarField &err) const
 Return the nomalized scalar error. More...
 
 ODESolver (const ODESolver &)
 Disallow default bitwise copy construct. More...
 
void operator= (const ODESolver &)
 Disallow default bitwise assignment. More...
 
- Protected Attributes inherited from ODESolver
const ODESystemodes_
 Reference to ODESystem. More...
 
const label maxN_
 Maximum size of the ODESystem. More...
 
label n_
 Size of the ODESystem (adjustable) More...
 
scalarField absTol_
 Absolute convergence tolerance per step. More...
 
scalarField relTol_
 Relative convergence tolerance per step. More...
 
label maxSteps_
 The maximum number of sub-steps allowed for the integration step. More...
 

Detailed Description

Semi-implicit Euler ODE solver of order (0)1.

The method calculates the new state from:

\[ y_{n+1} = y_n + \delta_x\left[I - \delta_x\frac{\partial f}{\partial y}\right]^{-1} \cdot \left[f(y_n) + \delta_x\frac{\partial f}{\partial x}\right] \]

The error is estimated directly from the change in the solution, i.e. the difference between the 0th and 1st order solutions:

\[ err_{n+1} = y_{n+1} - y_n \]

Source files

Definition at line 61 of file EulerSI.H.

Constructor & Destructor Documentation

◆ EulerSI()

EulerSI ( const ODESystem ode,
const dictionary dict 
)

Construct from ODESystem.

Definition at line 40 of file EulerSI.C.

◆ ~EulerSI()

virtual ~EulerSI ( )
inlinevirtual

Destructor.

Definition at line 89 of file EulerSI.H.

References EulerSI::resize(), EulerSI::solve(), ODESolver::solve(), x, y, and Foam::y0().

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Member Function Documentation

◆ TypeName()

TypeName ( "EulerSI"  )

Runtime type information.

◆ resize()

bool resize ( )
virtual

Resize the ODE solver.

Implements ODESolver.

Definition at line 55 of file EulerSI.C.

References ODESolver::n_, adaptiveSolver::resize(), ODESolver::resize(), ODESolver::resizeField(), ODESolver::resizeMatrix(), and EulerSI::solve().

Referenced by EulerSI::~EulerSI().

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◆ solve() [1/2]

Foam::scalar solve ( const scalar  x0,
const scalarField y0,
const scalarField dydx0,
const scalar  dx,
scalarField y 
) const
virtual

Solve a single step dx and return the error.

Implements adaptiveSolver.

Definition at line 78 of file EulerSI.C.

References forAll, ODESystem::jacobian(), Foam::LUBacksubstitute(), Foam::LUDecompose(), ODESolver::n_, ODESolver::normalizeError(), and ODESolver::odes_.

Referenced by EulerSI::resize(), and EulerSI::~EulerSI().

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◆ solve() [2/2]

void solve ( scalar &  x,
scalarField y,
scalar &  dxTry 
) const
virtual

Solve the ODE system and the update the state.

Reimplemented from ODESolver.

Definition at line 118 of file EulerSI.C.

References ODESolver::odes_, and adaptiveSolver::solve().

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