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

Packages that use PipeSection

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

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

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

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

Fields in neqsim.process.equipment.pipeline.twophasepipe declared as PipeSection

Modifier and Type	Field	Description
private PipeSection[]	TransientPipe.sections

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

Modifier and Type	Method	Description
PipeSection	PipeSection.clone()
PipeSection[]	TransientPipe.getSections()	Get all pipe sections with their state variables.

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

Modifier and Type	Method	Description
private void	TransientPipe.addSourceTerms(double[] U, PipeSection section, double dt)	Add source terms (gravity and friction) to the momentum equation.
private void	LagrangianSlugTracker.advanceSlug(LagrangianSlugTracker.SlugBubbleUnit slug, PipeSection[] sections, double dt)	Advance a single slug by one time step.
private void	SlugTracker.advanceSlug(SlugTracker.SlugUnit slug, PipeSection[] sections, double dt)	Advance a single slug.
void	SlugTracker.advanceSlugs(PipeSection[] sections, double dt)	Advance all slugs by one time step.
void	LagrangianSlugTracker.advanceTimeStep(PipeSection[] sections, double dt)	Advance all slugs by one time step.
private double	DriftFluxModel.calculateAnnularFriction(PipeSection section, DriftFluxModel.DriftFluxParameters params, double roughness)	Calculate friction for annular model.
private double[]	TransientPipe.calculateAUSMFlux(PipeSection left, PipeSection right)	Calculate AUSM+ numerical flux at interface.
private double	SlugTracker.calculateBubbleLength(SlugTracker.SlugUnit slug, PipeSection section)	Calculate Taylor bubble/film region length.
double	LiquidAccumulationTracker.calculateDrainageRate(LiquidAccumulationTracker.AccumulationZone zone, PipeSection[] sections, double pressureDrop)	Calculate drainage rate from a zone.
DriftFluxModel.DriftFluxParameters	DriftFluxModel.calculateDriftFlux(PipeSection section)	Calculate drift-flux parameters for a section.
DriftFluxModel.EnergyEquationResult	DriftFluxModel.calculateEnergyEquation(PipeSection section, DriftFluxModel.DriftFluxParameters params, double dt, double dx, double ambientTemperature, double overallHeatTransferCoeff, double jouleThomsonCoeff)	Calculate temperature change in fluid flow using the energy equation.
private double	LagrangianSlugTracker.calculateEquilibriumLength(PipeSection section)	Calculate equilibrium slug length using Barnea-Taitel model.
private double	SlugTracker.calculateEquilibriumLength(PipeSection section)	Calculate equilibrium slug length using Nydal correlation.
private double	LagrangianSlugTracker.calculateFilmHoldup(PipeSection section)	Calculate film holdup from section properties.
private double[][]	TransientPipe.calculateFluxes(PipeSection[] oldSections)	Calculate fluxes at cell interfaces using AUSM+ scheme.
private double	DriftFluxModel.calculateFrictionGradient(PipeSection section, DriftFluxModel.DriftFluxParameters params, double roughness)	Calculate friction pressure gradient.
private double	DriftFluxModel.calculateHomogeneousFriction(PipeSection section, DriftFluxModel.DriftFluxParameters params, double roughness)	Calculate friction for homogeneous model (bubble, slug, dispersed).
private void	LagrangianSlugTracker.calculateMassExchange(LagrangianSlugTracker.SlugBubbleUnit slug, PipeSection section, double dt)	Calculate mass exchange at slug front and tail.
double	DriftFluxModel.calculateMixtureHeatCapacity(PipeSection section, DriftFluxModel.DriftFluxParameters params, double Cp_gas, double Cp_liquid)	Calculate mixture heat capacity for two-phase flow.
private double	LagrangianSlugTracker.calculatePipeLength(PipeSection[] sections)	Calculate total pipe length.
double	DriftFluxModel.calculatePressureGradient(PipeSection section, DriftFluxModel.DriftFluxParameters params)	Calculate pressure gradient for drift-flux model.
private double	DriftFluxModel.calculateSinglePhaseGasFriction(PipeSection section, double roughness)	Calculate friction for single-phase gas flow.
private double	DriftFluxModel.calculateSinglePhaseLiquidFriction(PipeSection section, double roughness)	Calculate friction for single-phase liquid flow.
private void	LagrangianSlugTracker.calculateSlugVelocities(LagrangianSlugTracker.SlugBubbleUnit slug, PipeSection section)	Calculate slug front and tail velocities using Bendiksen correlation.
double	DriftFluxModel.calculateSteadyStateTemperature(PipeSection section, double upstreamTemperature, double dx, double ambientTemperature, double overallHeatTransferCoeff, double massFlowRate, double jouleThomsonCoeff)	Simplified energy equation for steady-state temperature profile calculation.
private double	DriftFluxModel.calculateStratifiedFriction(PipeSection section, DriftFluxModel.DriftFluxParameters params, double roughness)	Calculate friction for stratified flow (two-fluid approach).
LiquidAccumulationTracker.SlugCharacteristics	LiquidAccumulationTracker.checkForSlugRelease(LiquidAccumulationTracker.AccumulationZone zone, PipeSection[] sections)	Check if terrain-induced slug should be released.
private void	LagrangianSlugTracker.checkInletSlugGeneration(PipeSection[] sections, double dt)	Check for inlet slug generation based on frequency correlation.
private void	LagrangianSlugTracker.checkSlugInitiation(PipeSection[] sections, double dt)	Check conditions for slug initiation.
private void	LagrangianSlugTracker.checkStochasticInitiation(PipeSection[] sections, double dt)	Check for stochastic slug initiation from instabilities.
private void	LagrangianSlugTracker.clearSlugFlags(PipeSection[] sections)	Clear slug flags on all sections.
PipeSection.FlowRegime	FlowRegimeDetector.detectFlowRegime(PipeSection section)	Detect flow regime for a pipe section.
private PipeSection.FlowRegime	FlowRegimeDetector.detectFlowRegimeByMinimumSlip(PipeSection section)	Detect flow regime using minimum slip criterion.
private void	LiquidAccumulationTracker.distributeAccumulatedLiquid(LiquidAccumulationTracker.AccumulationZone zone, PipeSection[] sections)	Distribute accumulated liquid among sections in the zone.
private int	LagrangianSlugTracker.findSectionIndex(double position, PipeSection[] sections)	Find section index containing a position.
private int	SlugTracker.findSectionIndex(double position, PipeSection[] sections)	Find section index containing a position.
static TwoFluidSection	TwoFluidSection.fromPipeSection(PipeSection base)	Create from existing PipeSection.
private LagrangianSlugTracker.SlugBubbleUnit	LagrangianSlugTracker.generateInletSlug(PipeSection inlet)	Generate a new slug at the inlet.
SlugTracker.SlugUnit	SlugTracker.generateInletSlug(PipeSection inletSection, double pipeArea)	Generate slug at inlet based on flow conditions.
private LagrangianSlugTracker.SlugBubbleUnit	LagrangianSlugTracker.generateInstabilitySlug(PipeSection section, int sectionIndex, PipeSection[] sections)	Generate slug from flow instability.
PipeSection.FlowRegime[][]	FlowRegimeDetector.getFlowRegimeMap(PipeSection section, double U_SL_max, double U_SG_max, int resolution)	Get flow regime transition map for visualization/debugging.
private void	LagrangianSlugTracker.handleSlugMerging(PipeSection[] sections)	Handle merging of slugs that have caught up to each other.
void	LiquidAccumulationTracker.identifyAccumulationZones(PipeSection[] sections)	Identify low points and potential accumulation zones in the pipeline.
LagrangianSlugTracker.SlugBubbleUnit	LagrangianSlugTracker.initializeTerrainSlug(LiquidAccumulationTracker.SlugCharacteristics characteristics, PipeSection[] sections)	Initialize slug from terrain-induced accumulation.
SlugTracker.SlugUnit	SlugTracker.initializeTerrainSlug(LiquidAccumulationTracker.SlugCharacteristics characteristics, PipeSection[] sections)	Initialize slug from terrain-induced accumulation.
private void	LagrangianSlugTracker.markSlugSections(PipeSection[] sections)	Mark sections that are within slug bodies or bubbles.
private void	SlugTracker.markSlugSections(SlugTracker.SlugUnit slug, PipeSection[] sections)	Mark sections that are within a slug.
private void	LagrangianSlugTracker.mergeSlugPair(LagrangianSlugTracker.SlugBubbleUnit survivor, LagrangianSlugTracker.SlugBubbleUnit absorbed, PipeSection[] sections)	Merge two slugs into one.
private void	LagrangianSlugTracker.removeInactiveSlugs(PipeSection[] sections)	Remove slugs that have exited the pipe or dissipated.
private void	SlugTracker.removeInactiveSlugs(PipeSection[] sections)	Remove slugs that have exited pipe or dissipated, returning mass to Eulerian cells.
private void	LagrangianSlugTracker.returnMassToEulerian(LagrangianSlugTracker.SlugBubbleUnit slug, PipeSection[] sections)	Return mass from dissipating slug to Eulerian cells.
private void	SlugTracker.returnMassToEulerianCells(SlugTracker.SlugUnit slug, PipeSection[] sections)	Return liquid mass from a dissipating slug back to Eulerian cells.
void	LiquidAccumulationTracker.updateAccumulation(PipeSection[] sections, double dt)	Update liquid accumulation for all zones.
private void	LagrangianSlugTracker.updateBubbleLength(LagrangianSlugTracker.SlugBubbleUnit slug, PipeSection section)	Update Taylor bubble length.
private void	TransientPipe.updatePrimitiveVariables(PipeSection section, PipeSection oldSection, double[] U, int sectionIndex, double dt, double momentumFluxLeft, double momentumFluxRight)	Update primitive variables from conservative variables.
private void	LagrangianSlugTracker.updateWakeEffects(PipeSection[] sections)	Update wake effects between consecutive slugs.
private void	LiquidAccumulationTracker.updateZone(LiquidAccumulationTracker.AccumulationZone zone, PipeSection[] sections, double dt)	Update a single accumulation zone.