Class ThreeFluidSection

java.lang.Object
neqsim.process.equipment.pipeline.twophasepipe.PipeSection
neqsim.process.equipment.pipeline.twophasepipe.TwoFluidSection
neqsim.process.equipment.pipeline.twophasepipe.ThreeFluidSection
All Implemented Interfaces:
Serializable, Cloneable
public class ThreeFluidSection extends TwoFluidSection implements Cloneable, Serializable
Extended section state for three-phase (gas-oil-water) pipe flow.

Extends TwoFluidSection to include a water phase alongside gas and liquid (oil). Uses a layered stratified model where water settles at the bottom, oil in the middle, and gas at the top.

Conservation Variables

The three-fluid model tracks 7 PDEs:
  • Gas mass: ∂(α_g ρ_g A)/∂t + ∂(α_g ρ_g u_g A)/∂x = Γ_go + Γ_gw
  • Oil mass: ∂(α_o ρ_o A)/∂t + ∂(α_o ρ_o u_o A)/∂x = -Γ_go
  • Water mass: ∂(α_w ρ_w A)/∂t + ∂(α_w ρ_w u_w A)/∂x = -Γ_gw
  • Gas momentum
  • Oil momentum
  • Water momentum
  • Mixture energy (or separate phase energies)

Stratified Three-Layer Geometry

        Gas (α_g)
    ─────────────────
        Oil (α_o)
    ─────────────────
       Water (α_w)
Version:
1.0
Author:
Even Solbraa
See Also:

  • Field Details

    • serialVersionUID

      private static final long serialVersionUID
      See Also:

    • waterHoldup

      private double waterHoldup

    • waterVelocity

      private double waterVelocity

    • waterDensity

      private double waterDensity

    • waterViscosity

      private double waterViscosity

    • waterEnthalpy

      private double waterEnthalpy

    • oilHoldup

      private double oilHoldup

    • oilVelocity

      private double oilVelocity

    • oilDensity

      private double oilDensity

    • oilViscosity

      private double oilViscosity

    • oilEnthalpy

      private double oilEnthalpy

    • waterMassPerLength

      private double waterMassPerLength

    • waterMomentumPerLength

      private double waterMomentumPerLength

    • oilMassPerLength

      private double oilMassPerLength

    • oilMomentumPerLength

      private double oilMomentumPerLength

    • gasOilSurfaceTension

      private double gasOilSurfaceTension

    • oilWaterSurfaceTension

      private double oilWaterSurfaceTension

    • gasWaterSurfaceTension

      private double gasWaterSurfaceTension

    • waterLevel

      private double waterLevel

    • oilLevel

      private double oilLevel

    • waterArea

      private double waterArea

    • oilArea

      private double oilArea

    • waterWettedPerimeter

      private double waterWettedPerimeter

    • oilWettedPerimeter

      private double oilWettedPerimeter

    • gasOilInterfacialWidth

      private double gasOilInterfacialWidth

    • oilWaterInterfacialWidth

      private double oilWaterInterfacialWidth

    • waterCut

      private double waterCut

    • oilEvaporationRate

      private double oilEvaporationRate

    • waterEvaporationRate

      private double waterEvaporationRate

  • Constructor Details

    • ThreeFluidSection

      public ThreeFluidSection()
      Default constructor.

    • ThreeFluidSection

      public ThreeFluidSection(double position, double length, double diameter)
      Constructor with basic parameters.
      Parameters:
      position - Distance from inlet (m)
      length - Section length (m)
      diameter - Pipe diameter (m)

    • ThreeFluidSection

      public ThreeFluidSection(double position, double length, double diameter, double inclination)
      Constructor with inclination.
      Parameters:
      position - Distance from inlet (m)
      length - Section length (m)
      diameter - Pipe diameter (m)
      inclination - Pipe inclination (radians)

  • Method Details

    • initializeWaterPhase

      private void initializeWaterPhase()
      Initialize water phase with default values.

    • setHoldups

      public void setHoldups(double gasHoldup, double oilHoldup, double waterHoldup)
      Set holdups for all three phases. Must sum to 1.0.
      Parameters:
      gasHoldup - Gas holdup (0-1)
      oilHoldup - Oil holdup (0-1)
      waterHoldup - Water holdup (0-1)

    • updateConservativeVariables

      public void updateConservativeVariables()
      Update conservative variables from primitive variables.
      Overrides:
      updateConservativeVariables in class TwoFluidSection

    • extractPrimitiveVariables

      public void extractPrimitiveVariables()
      Extract primitive variables from conservative variables.
      Overrides:
      extractPrimitiveVariables in class TwoFluidSection

    • updateThreeLayerGeometry

      public void updateThreeLayerGeometry()
      Calculate three-layer stratified geometry.

      Assumes circular pipe with three stratified layers: water at bottom, oil in middle, gas at top.

    • calculateLevelFromArea

      private double calculateLevelFromArea(double targetArea, double d)
      Calculate liquid level from cross-sectional area using Newton iteration.
      Parameters:
      targetArea - target cross-sectional area in m²
      d - pipe diameter in meters
      Returns:
      liquid level height in meters

    • getTotalLiquidHoldup

      public double getTotalLiquidHoldup()
      Get total liquid holdup (oil + water).
      Returns:
      Total liquid holdup

    • getMixtureLiquidVelocity

      public double getMixtureLiquidVelocity()
      Get mixture liquid velocity (flow-weighted average).
      Returns:
      Mixture liquid velocity (m/s)

    • getMixtureLiquidDensity

      public double getMixtureLiquidDensity()
      Get mixture liquid density (holdup-weighted average).
      Returns:
      Mixture liquid density (kg/m³)

    • getMixtureLiquidViscosity

      public double getMixtureLiquidViscosity()
      Get mixture liquid viscosity (holdup-weighted average).
      Returns:
      Mixture liquid viscosity (Pa·s)

    • clone

      public ThreeFluidSection clone()
      Create a deep copy of this section.
      Overrides:
      clone in class TwoFluidSection
      Returns:
      Cloned section

    • getWaterHoldup

      public double getWaterHoldup()
      Overrides:
      getWaterHoldup in class TwoFluidSection

    • setWaterHoldup

      public void setWaterHoldup(double waterHoldup)
      Overrides:
      setWaterHoldup in class TwoFluidSection

    • getWaterVelocity

      public double getWaterVelocity()
      Overrides:
      getWaterVelocity in class TwoFluidSection

    • setWaterVelocity

      public void setWaterVelocity(double waterVelocity)
      Overrides:
      setWaterVelocity in class TwoFluidSection

    • getWaterDensity

      public double getWaterDensity()
      Overrides:
      getWaterDensity in class TwoFluidSection

    • setWaterDensity

      public void setWaterDensity(double waterDensity)
      Overrides:
      setWaterDensity in class TwoFluidSection

    • getWaterViscosity

      public double getWaterViscosity()
      Overrides:
      getWaterViscosity in class TwoFluidSection

    • setWaterViscosity

      public void setWaterViscosity(double waterViscosity)
      Overrides:
      setWaterViscosity in class TwoFluidSection

    • getWaterEnthalpy

      public double getWaterEnthalpy()

    • setWaterEnthalpy

      public void setWaterEnthalpy(double waterEnthalpy)

    • getOilHoldup

      public double getOilHoldup()
      Overrides:
      getOilHoldup in class TwoFluidSection

    • setOilHoldup

      public void setOilHoldup(double oilHoldup)
      Overrides:
      setOilHoldup in class TwoFluidSection

    • getOilVelocity

      public double getOilVelocity()
      Overrides:
      getOilVelocity in class TwoFluidSection

    • setOilVelocity

      public void setOilVelocity(double oilVelocity)
      Overrides:
      setOilVelocity in class TwoFluidSection

    • getOilDensity

      public double getOilDensity()
      Overrides:
      getOilDensity in class TwoFluidSection

    • setOilDensity

      public void setOilDensity(double oilDensity)
      Overrides:
      setOilDensity in class TwoFluidSection

    • getOilViscosity

      public double getOilViscosity()
      Overrides:
      getOilViscosity in class TwoFluidSection

    • setOilViscosity

      public void setOilViscosity(double oilViscosity)
      Overrides:
      setOilViscosity in class TwoFluidSection

    • getOilEnthalpy

      public double getOilEnthalpy()

    • setOilEnthalpy

      public void setOilEnthalpy(double oilEnthalpy)

    • getWaterMassPerLength

      public double getWaterMassPerLength()
      Overrides:
      getWaterMassPerLength in class TwoFluidSection

    • setWaterMassPerLength

      public void setWaterMassPerLength(double waterMassPerLength)
      Overrides:
      setWaterMassPerLength in class TwoFluidSection

    • getWaterMomentumPerLength

      public double getWaterMomentumPerLength()
      Overrides:
      getWaterMomentumPerLength in class TwoFluidSection

    • setWaterMomentumPerLength

      public void setWaterMomentumPerLength(double waterMomentumPerLength)
      Overrides:
      setWaterMomentumPerLength in class TwoFluidSection

    • getOilMassPerLength

      public double getOilMassPerLength()
      Overrides:
      getOilMassPerLength in class TwoFluidSection

    • setOilMassPerLength

      public void setOilMassPerLength(double oilMassPerLength)
      Overrides:
      setOilMassPerLength in class TwoFluidSection

    • getOilMomentumPerLength

      public double getOilMomentumPerLength()
      Overrides:
      getOilMomentumPerLength in class TwoFluidSection

    • setOilMomentumPerLength

      public void setOilMomentumPerLength(double oilMomentumPerLength)
      Overrides:
      setOilMomentumPerLength in class TwoFluidSection

    • getWaterLevel

      public double getWaterLevel()

    • getOilLevel

      public double getOilLevel()

    • getWaterArea

      public double getWaterArea()

    • getOilArea

      public double getOilArea()

    • getWaterWettedPerimeter

      public double getWaterWettedPerimeter()

    • getOilWettedPerimeter

      public double getOilWettedPerimeter()

    • getGasOilInterfacialWidth

      public double getGasOilInterfacialWidth()

    • getOilWaterInterfacialWidth

      public double getOilWaterInterfacialWidth()

    • getGasOilSurfaceTension

      public double getGasOilSurfaceTension()

    • setGasOilSurfaceTension

      public void setGasOilSurfaceTension(double gasOilSurfaceTension)

    • getOilWaterSurfaceTension

      public double getOilWaterSurfaceTension()

    • setOilWaterSurfaceTension

      public void setOilWaterSurfaceTension(double oilWaterSurfaceTension)

    • getGasWaterSurfaceTension

      public double getGasWaterSurfaceTension()

    • setGasWaterSurfaceTension

      public void setGasWaterSurfaceTension(double gasWaterSurfaceTension)

    • getWaterCut

      public double getWaterCut()
      Overrides:
      getWaterCut in class TwoFluidSection

    • setWaterCut

      public void setWaterCut(double waterCut)
      Overrides:
      setWaterCut in class TwoFluidSection

    • getOilEvaporationRate

      public double getOilEvaporationRate()

    • setOilEvaporationRate

      public void setOilEvaporationRate(double oilEvaporationRate)

    • getWaterEvaporationRate

      public double getWaterEvaporationRate()

    • setWaterEvaporationRate

      public void setWaterEvaporationRate(double waterEvaporationRate)