Uses of Class
neqsim.process.equipment.pipeline.twophasepipe.TwoFluidSection

Packages that use TwoFluidSection

Package	Description
neqsim.process.equipment.pipeline
neqsim.process.equipment.pipeline.twophasepipe	Transient multiphase pipe flow models.

Uses of TwoFluidSection in neqsim.process.equipment.pipeline

Fields in neqsim.process.equipment.pipeline declared as TwoFluidSection

Modifier and Type	Field	Description
private TwoFluidSection[]	TwoFluidPipe.sections	Pipe sections with state.

Methods in neqsim.process.equipment.pipeline with parameters of type TwoFluidSection

Modifier and Type	Method	Description
private double[]	TwoFluidPipe.calculateLocalHoldup(TwoFluidSection sec, TwoFluidSection prev, double mDotGas, double mDotLiq, double area)	Calculate local liquid holdup using drift-flux model with terrain effects.
private double	TwoFluidPipe.estimatePressureGradient(TwoFluidSection sec)	Estimate pressure gradient for steady-state initialization.
private void	TwoFluidPipe.updateWaterOilHoldups(TwoFluidSection sec, TwoFluidSection prev, double alphaL, double area)	Update water and oil holdups for three-phase flow with terrain effects.

Uses of TwoFluidSection in neqsim.process.equipment.pipeline.twophasepipe

Subclasses of TwoFluidSection in neqsim.process.equipment.pipeline.twophasepipe

Modifier and Type	Class	Description
class	ThreeFluidSection	Extended section state for three-phase (gas-oil-water) pipe flow.

Methods in neqsim.process.equipment.pipeline.twophasepipe that return TwoFluidSection

Modifier and Type	Method	Description
TwoFluidSection	TwoFluidSection.clone()
static TwoFluidSection	TwoFluidSection.fromPipeSection(PipeSection base)	Create from existing PipeSection.

Methods in neqsim.process.equipment.pipeline.twophasepipe with parameters of type TwoFluidSection

Modifier and Type	Method	Description
void	TwoFluidConservationEquations.applyPressureGradient(TwoFluidSection[] sections, double[][] dUdt, double dx)	Apply pressure gradient term (handled separately for numerical stability).
void	TwoFluidConservationEquations.applyState(TwoFluidSection[] sections, double[][] U)	Apply state to sections from array format.
private double	TwoFluidConservationEquations.calcFrictionWork(TwoFluidSection sec)	Calculate friction work (viscous dissipation).
private double	TwoFluidConservationEquations.calcHeatTransfer(TwoFluidSection sec)	Calculate heat transfer to/from pipe wall.
private double[]	TwoFluidConservationEquations.calcInletFlux(TwoFluidSection sec)	Calculate inlet flux using the inlet cell state.
private double[][]	TwoFluidConservationEquations.calcInterfaceFluxes(TwoFluidSection[] sections, double dx)	Calculate fluxes at cell interfaces using AUSM+.
private double[]	TwoFluidConservationEquations.calcMassTransfer(TwoFluidSection sec)	Calculate mass transfer between phases (simplified model).
double	ThermodynamicCoupling.calcMassTransferRate(TwoFluidSection section, double relaxationTime)	Calculate mass transfer rate between phases (evaporation/condensation).
double	ThermodynamicCoupling.calcMixtureSoundSpeed(TwoFluidSection section)	Calculate mixture sound speed for wave propagation.
private double[]	TwoFluidConservationEquations.calcOutletFlux(TwoFluidSection sec)	Calculate outlet flux using upwind scheme (transmissive boundary).
double[][]	TwoFluidConservationEquations.calcRHS(TwoFluidSection[] sections, double dx)	Calculate the right-hand side (dU/dt) for all cells.
private double[][]	TwoFluidConservationEquations.calcSourceTerms(TwoFluidSection[] sections)	Calculate source terms for all cells.
private AUSMPlusFluxCalculator.PhaseState	TwoFluidConservationEquations.createGasState(TwoFluidSection sec)	Create gas phase state for flux calculation.
private AUSMPlusFluxCalculator.PhaseState	TwoFluidConservationEquations.createLiquidState(TwoFluidSection sec)	Create liquid phase state for flux calculation.
private AUSMPlusFluxCalculator.PhaseState	TwoFluidConservationEquations.createOilState(TwoFluidSection sec)	Create oil phase state for flux calculation in three-phase flow.
private AUSMPlusFluxCalculator.PhaseState	TwoFluidConservationEquations.createWaterState(TwoFluidSection sec)	Create water phase state for flux calculation in three-phase flow.
double[][]	TwoFluidConservationEquations.extractState(TwoFluidSection[] sections)	Extract state from sections into array format.
void	ThermodynamicCoupling.updateAllSections(TwoFluidSection[] sections)	Update all sections in an array with thermodynamic properties.
private void	TwoFluidConservationEquations.updateClosureRelations(TwoFluidSection[] sections)	Update closure relations for all sections.
void	ThermodynamicCoupling.updateSectionProperties(TwoFluidSection section)	Update a TwoFluidSection with thermodynamic properties at its P-T conditions.