Multiphase Flow Modeling in ANSYS CFX

• This training course covers the theory and practice of multiphase flows as implemented in ANSYS CFX
• This course contains advanced material and is intended primarily for existing users of ANSYS CFX.

Introduction to Multiphase Flows
• Multiphase Flow Overview
• Basic definitions and concepts
• Phenomenon to be modeled
• Modeling Approaches

Phase: Thermodynamics defines phase as a chemically and physically uniform quantity of matter that can be separated mechanically from a non homogeneous mixture. It may consist of a single substance or a
mixture of substance.

Multiphase Flow is flow involving more than one phase, mixed macroscopically
• Examples: Water droplets in air , Air bubbles in oil, Sand particles in water

Modeling Approaches

Interphase Momentum and Heat Transfer
• Interphase Momentum Transfer
― Drag Force
― Non Drag Forces
• Lift Force
• Wall Lubrication Force
• Virtual Mass Force
• Turbulent Dispersion Force

Free Surface Flows
• Homogeneous and inhomogeneous free surface flows
• Resolving the free surface interface
• Modeling strategies
• Typical free surface applications
• Important physical phenomena
• Classifying free surface flows
• Including the effects of the surface tension force
• Free surface examples
• Coupled volume fractions
• Special boundary conditions for free surface flows

Lagrangian Particle Tracking
• Particle tracking in ANSYS CFX
• Particle transport equations
• Particle integration algorithm
• General setup of particle tracking in ANSYS CFX
• Particle injection
• Turbulent dispersion
• Wall Treatment
• Particle integration controls
• Particle variables as vertex variables
• Particle-particle collisions

Advanced Lagrangian Particle Tracking
• Transient particle tracking
• Particle breakup models
• Particle mass transfer
• Particle erosion
• Particle-wall interactions and wall films

Interphase Mass Transfer
• Equilibrium Phase Change Model
• Non Equilibrium Phase Change Models
– Thermal Phase Change Model
• RPI Wall Boiling Model
– Cavitation Model (Rayleigh Plesset Model)
– The Droplet Condensation Model

Population Balance Methods for Multiphase Flows
• Introduction to Population Balance Methods
• MUSIG Model
– Homogeneous
– Inhomogeneous
• DQMOM (Method of Moments)
– Beta feature, provides capability similar to MUSIG

Granular Solid Models in ANSYS CFX
• Gas-Solid flow regimes
• Particle-particle interactions
• Maximum Packing
• Solids Pressure
• Kinetic Theory

Phase Change in Multicomponent Multiphase Flows
• Phase change for multi-component systems
• Species transfer for multiphase flows
• Finite mass transfer effects
• User defined species transfer
• Sink option for multicomponent fluids
• Enthalpy effects and latent heat
• Source linearization

Tips and Tricks in Multiphase Flows
• Boundary Conditions
• Dense Particle Effects
• Turbulence in Multiphase Flows
• Particle Induced Turbulence
• Interfacial Area Modeling
• Convergence Issues
• Expert Parameters and CCL Settings

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