| Cantera 3.0.0

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Public Member Functions | List of all members
UnityLewisTransport Class Reference
Transport Properties

Class UnityLewisTransport implements the unity Lewis number approximation for the mixture-averaged species diffusion coefficients. More...

`#include <UnityLewisTransport.h>`

Inheritance diagram for UnityLewisTransport:
[legend]

## Detailed Description

Class UnityLewisTransport implements the unity Lewis number approximation for the mixture-averaged species diffusion coefficients.

Mixture-averaged transport properties for viscosity and thermal conductivity are inherited from the MixTransport class.

Definition at line 25 of file UnityLewisTransport.h.

## Public Member Functions
string | transportModel () const override
| Identifies the model represented by this Transport object.
void | getMixDiffCoeffs (double *const d) override
| Returns the unity Lewis number approximation based diffusion coefficients [m^2/s].
void | getMixDiffCoeffsMole (double *const d) override
| Not implemented for unity Lewis number approximation.
void | getMixDiffCoeffsMass (double *const d) override
| Returns the unity Lewis number approximation based diffusion coefficients [m^2/s].
Public Member Functions inherited from MixTransport
| MixTransport ()=default
| Default constructor.
void | getThermalDiffCoeffs (double *const dt) override
| Return the thermal diffusion coefficients.
double | thermalConductivity () override
| Returns the mixture thermal conductivity (W/m /K)
void | getMobilities (double *const mobil) override
| Get the Electrical mobilities (m^2/V/s).
void | update_T () override
| Update the internal parameters whenever the temperature has changed.
void | update_C () override
| Update the internal parameters whenever the concentrations have changed.
void | getSpeciesFluxes (size_t ndim, const double *const grad_T, size_t ldx, const double *const grad_X, size_t ldf, double *const fluxes) override
| Get the species diffusive mass fluxes wrt to the mass averaged velocity, given the gradients in mole fraction and temperature.
void | init (ThermoPhase *thermo, int mode=0, int log_level=0) override
| Initialize a transport manager.
Public Member Functions inherited from GasTransport
double | viscosity () override
| Viscosity of the mixture (kg /m /s)
void | getSpeciesViscosities (double *const visc) override
| Get the pure-species viscosities.
void | getBinaryDiffCoeffs (const size_t ld, double *const d) override
| Returns the matrix of binary diffusion coefficients.
void | getViscosityPolynomial (size_t i, double *coeffs) const override
| Return the polynomial fits to the viscosity of species i.
void | getConductivityPolynomial (size_t i, double *coeffs) const override
| Return the temperature fits of the heat conductivity of species i.
void | getBinDiffusivityPolynomial (size_t i, size_t j, double *coeffs) const override
| Return the polynomial fits to the binary diffusivity of species pair (i, j)
void | getCollisionIntegralPolynomial (size_t i, size_t j, double *astar_coeffs, double *bstar_coeffs, double *cstar_coeffs) const override
| Return the polynomial fits to the collision integral of species pair (i, j)
void | setViscosityPolynomial (size_t i, double *coeffs) override
| Modify the polynomial fits to the viscosity of species i.
void | setConductivityPolynomial (size_t i, double *coeffs) override
| Modify the temperature fits of the heat conductivity of species i.
void | setBinDiffusivityPolynomial (size_t i, size_t j, double *coeffs) override
| Modify the polynomial fits to the binary diffusivity of species pair (i, j)
void | setCollisionIntegralPolynomial (size_t i, size_t j, double *astar_coeffs, double *bstar_coeffs, double *cstar_coeffs, bool actualT) override
| Modify the polynomial fits to the collision integral of species pair (i, j)
bool | CKMode () const override
| Boolean indicating the form of the transport properties polynomial fits.
Public Member Functions inherited from Transport
| Transport (ThermoPhase *thermo=0, size_t ndim=npos)
| Constructor.
| Transport (const Transport &)=delete
Transport & | operator= (const Transport &)=delete
string | transportType () const
| Identifies the Transport object type.
ThermoPhase & | thermo ()
| Phase object.
bool | ready ()
| Returns true if the transport manager is ready for use.
void | setNDim (const int ndim)
| Set the number of dimensions to be expected in flux expressions.
size_t | nDim () const
| Return the number of dimensions in flux expressions.
void | checkSpeciesIndex (size_t k) const
| Check that the specified species index is in range.
void | checkSpeciesArraySize (size_t kk) const
| Check that an array size is at least nSpecies().
virtual double | getElectricConduct ()
| Compute the mixture electrical conductivity (S m-1) at the current conditions of the phase (Siemens m-1)
virtual void | getElectricCurrent (int ndim, const double *grad_T, int ldx, const double *grad_X, int ldf, const double *grad_V, double *current)
| Compute the electric current density in A/m^2.
virtual void | getSpeciesFluxesES (size_t ndim, const double *grad_T, size_t ldx, const double *grad_X, size_t ldf, const double *grad_Phi, double *fluxes)
| Get the species diffusive mass fluxes wrt to the mass averaged velocity, given the gradients in mole fraction, temperature and electrostatic potential.
virtual void | getSpeciesVdiff (size_t ndim, const double *grad_T, int ldx, const double *grad_X, int ldf, double *Vdiff)
| Get the species diffusive velocities wrt to the mass averaged velocity, given the gradients in mole fraction and temperature.
virtual void | getSpeciesVdiffES (size_t ndim, const double *grad_T, int ldx, const double *grad_X, int ldf, const double *grad_Phi, double *Vdiff)
| Get the species diffusive velocities wrt to the mass averaged velocity, given the gradients in mole fraction, temperature, and electrostatic potential.
virtual void | getMolarFluxes (const double *const state1, const double *const state2, const double delta, double *const cfluxes)
| Get the molar fluxes [kmol/m^2/s], given the thermodynamic state at two nearby points.
virtual void | getMassFluxes (const double *state1, const double *state2, double delta, double *mfluxes)
| Get the mass fluxes [kg/m^2/s], given the thermodynamic state at two nearby points.
virtual void | getMultiDiffCoeffs (const size_t ld, double *const d)
| Return the Multicomponent diffusion coefficients. Units: [m^2/s].
virtual void | setParameters (const int type, const int k, const double *const p)
| Set model parameters for derived classes.
AnyMap | parameters () const
| Return the parameters for a phase definition which are needed to reconstruct an identical object using the newTransport function.
void | setVelocityBasis (VelocityBasis ivb)
| Sets the velocity basis.
VelocityBasis | getVelocityBasis () const
| Gets the velocity basis.
virtual double | bulkViscosity ()
| The bulk viscosity in Pa-s.
virtual double | ionConductivity ()
| The ionic conductivity in 1/ohm/m.
virtual void | getSpeciesIonConductivity (double *const ionCond)
| Returns the pure species ionic conductivity.
virtual void | mobilityRatio (double *mobRat)
| Returns the pointer to the mobility ratios of the species in the phase.
virtual void | getSpeciesMobilityRatio (double **mobRat)
| Returns the pure species limit of the mobility ratios.
virtual double | electricalConductivity ()
| The electrical conductivity (Siemens/m).
virtual void | getFluidMobilities (double *const mobil_f)
| Get the fluid mobilities (s kmol/kg).
virtual void | setThermo (ThermoPhase &thermo)
| Specifies the ThermoPhase object.
virtual void | setRoot (shared_ptr< Solution > root)
| Set root Solution holding all phase information.

## Additional Inherited Members
Protected Member Functions inherited from MixTransport
void | updateCond_T ()
| Update the temperature dependent parts of the species thermal conductivities.
Protected Member Functions inherited from GasTransport
| GasTransport (ThermoPhase *thermo=0)
virtual void | updateViscosity_T ()
| Update the temperature-dependent viscosity terms.
virtual void | updateSpeciesViscosities ()
| Update the pure-species viscosities.
virtual void | updateDiff_T ()
| Update the binary diffusion coefficients.
virtual void | setupCollisionParameters ()
| Setup parameters for a new kinetic-theory-based transport manager for low-density gases.
void | setupCollisionIntegral ()
| Setup range for polynomial fits to collision integrals of Monchick & Mason [monchick1961].
void | getTransportData ()
| Read the transport database.
void | makePolarCorrections (size_t i, size_t j, double &f_eps, double &f_sigma)
| Corrections for polar-nonpolar binary diffusion coefficients.
void | fitCollisionIntegrals (MMCollisionInt &integrals)
| Generate polynomial fits to collision integrals.
virtual void | fitProperties (MMCollisionInt &integrals)
| Generate polynomial fits to the viscosity \( \eta \) and conductivity \( \lambda \).
virtual void | fitDiffCoeffs (MMCollisionInt &integrals)
| Generate polynomial fits to the binary diffusion coefficients.
void | getBinDiffCorrection (double t, MMCollisionInt &integrals, size_t k, size_t j, double xk, double xj, double &fkj, double &fjk)
| Second-order correction to the binary diffusion coefficients.
Protected Member Functions inherited from Transport
void | finalize ()
| Enable the transport object for use.
Protected Attributes inherited from MixTransport
vector< double > | m_cond
| vector of species thermal conductivities (W/m /K)
double | m_lambda = 0.0
| Internal storage for the calculated mixture thermal conductivity.
bool | m_spcond_ok = false
| Update boolean for the species thermal conductivities.
bool | m_condmix_ok = false
| Update boolean for the mixture rule for the mixture thermal conductivity.
Protected Attributes inherited from GasTransport
vector< double > | m_molefracs
| Vector of species mole fractions.
double | m_viscmix = 0.0
| Internal storage for the viscosity of the mixture (kg /m /s)
bool | m_visc_ok = false
| Update boolean for mixture rule for the mixture viscosity.
bool | m_viscwt_ok = false
| Update boolean for the weighting factors for the mixture viscosity.
bool | m_spvisc_ok = false
| Update boolean for the species viscosities.
bool | m_bindiff_ok = false
| Update boolean for the binary diffusivities at unit pressure.
int | m_mode = 0
| Type of the polynomial fits to temperature.
DenseMatrix | m_phi
| m_phi is a Viscosity Weighting Function. size = m_nsp * n_nsp
vector< double > | m_spwork
| work space length = m_kk
vector< double > | m_visc
| vector of species viscosities (kg /m /s).
vector< vector< double > > | m_visccoeffs
| Polynomial fits to the viscosity of each species.
vector< double > | m_mw
| Local copy of the species molecular weights.
DenseMatrix | m_wratjk
| Holds square roots of molecular weight ratios.
DenseMatrix | m_wratkj1
| Holds square roots of molecular weight ratios.
vector< double > | m_sqvisc
| vector of square root of species viscosities sqrt(kg /m /s).
vector< double > | m_polytempvec
| Powers of the ln temperature, up to fourth order.
double | m_temp = -1.0
| Current value of the temperature at which the properties in this object are calculated (Kelvin).
double | m_kbt = 0.0
| Current value of Boltzmann constant times the temperature (Joules)
double | m_sqrt_t = 0.0
| current value of temperature to 1/2 power
double | m_logt = 0.0
| Current value of the log of the temperature.
double | m_t14 = 0.0
| Current value of temperature to 1/4 power.
vector< vector< double > > | m_diffcoeffs
| Polynomial fits to the binary diffusivity of each species.
DenseMatrix | m_bdiff
| Matrix of binary diffusion coefficients at the reference pressure and the current temperature Size is nsp x nsp.
vector< vector< double > > | m_condcoeffs
| temperature fits of the heat conduction
vector< vector< int > > | m_poly
| Indices for the (i,j) interaction in collision integral fits.
vector< vector< double > > | m_omega22_poly
| Fit for omega22 collision integral.
vector< vector< int > > | m_star_poly_uses_actualT
| Flag to indicate for which (i,j) interaction pairs the actual temperature is used instead of the reduced temperature.
vector< vector< double > > | m_astar_poly
| Fit for astar collision integral.
vector< vector< double > > | m_bstar_poly
| Fit for bstar collision integral.
vector< vector< double > > | m_cstar_poly
| Fit for cstar collision integral.
vector< double > | m_zrot
| Rotational relaxation number for each species.
vector< double > | m_crot
| Dimensionless rotational heat capacity of each species.
vector< bool > | m_polar
| Vector of booleans indicating whether a species is a polar molecule.
vector< double > | m_alpha
| Polarizability of each species in the phase.
vector< double > | m_eps
| Lennard-Jones well-depth of the species in the current phase.
vector< double > | m_sigma
| Lennard-Jones diameter of the species in the current phase.
DenseMatrix | m_reducedMass
| This is the reduced mass of the interaction between species i and j.
DenseMatrix | m_diam
| hard-sphere diameter for (i,j) collision
DenseMatrix | m_epsilon
| The effective well depth for (i,j) collisions.
DenseMatrix | m_dipole
| The effective dipole moment for (i,j) collisions.
DenseMatrix | m_delta
| Reduced dipole moment of the interaction between two species.
vector< double > | m_w_ac
| Pitzer acentric factor.
vector< double > | m_disp
| Dispersion coefficient.
vector< double > | m_quad_polar
| Quadrupole polarizability.
int | m_log_level = 0
| Level of verbose printing during initialization.
Protected Attributes inherited from Transport
ThermoPhase * | m_thermo
| pointer to the object representing the phase
bool | m_ready = false
| true if finalize has been called
size_t | m_nsp = 0
| Number of species.
size_t | m_nDim
| Number of dimensions used in flux expressions.
int | m_velocityBasis = VB_MASSAVG
| Velocity basis from which diffusion velocities are computed.
std::weak_ptr< Solution > | m_root
| reference to Solution

## Member Function Documentation

## ◆ transportModel()

string transportModel | ( |  | ) | const
| inline override virtual

Identifies the model represented by this Transport object.

Each derived class should override this method to return a meaningful identifier.

Since
  New in Cantera 3.0. The name returned by this method corresponds to the canonical name used in the YAML input format.

Reimplemented from MixTransport.

Definition at line 30 of file UnityLewisTransport.h.

## ◆ getMixDiffCoeffs()

void getMixDiffCoeffs | ( | double *const | d | ) |
| inline override virtual

Returns the unity Lewis number approximation based diffusion coefficients [m^2/s].

Returns the unity Lewis number approximation based diffusion coefficients for a gas, appropriate for calculating the mass averaged diffusive flux with respect to the mass averaged velocity using gradients of the mole fraction.

\[ D^\prime_{km} = \frac{\lambda}{\rho c_p} \]

In order to obtain the expected behavior from a unity Lewis number model, this formulation requires that the correction velocity be computed as

\[ V_c = \sum \frac{W_k}{\overline{W}} D^\prime_{km} \nabla X_k \]

Parameters

  [out] | d | Vector of diffusion coefficients for each species (m^2/s). length m_nsp.

Reimplemented from GasTransport.

Definition at line 56 of file UnityLewisTransport.h.

## ◆ getMixDiffCoeffsMole()

void getMixDiffCoeffsMole | ( | double *const | d | ) |
| inline override virtual

Not implemented for unity Lewis number approximation.

Reimplemented from GasTransport.

Definition at line 64 of file UnityLewisTransport.h.

## ◆ getMixDiffCoeffsMass()

void getMixDiffCoeffsMass | ( | double *const | d | ) |
| inline override virtual

Returns the unity Lewis number approximation based diffusion coefficients [m^2/s].

These are the coefficients for calculating the diffusive mass fluxes from the species mass fraction gradients, computed as

\[ D_{km} = \frac{\lambda}{\rho c_p} \]

Parameters

  [out] | d | Vector of diffusion coefficients for each species (m^2/s). length m_nsp.

Reimplemented from GasTransport.

Definition at line 81 of file UnityLewisTransport.h.

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

- UnityLewisTransport.h