Eulerian Two Phase Flow within a Convergent-Divergent Channel CFD Simulation

This ADVANCED level ANSYS Fluent CFD simulation tutorial explores the complex dynamics of two-phase flow through a convergent-divergent channel using the Eulerian multiphase model. This episode is designed to provide an in-depth understanding of multiphase flow behavior in varying cross-sectional geometries, with a specific focus on the application and nuances of the Eulerian approach.

Key aspects of this advanced-level simulation include:

Eulerian Multiphase Model Setup: Detailed implementation of the Eulerian model to accurately represent two distinct phases, capturing their individual flow characteristics and interactions within the convergent-divergent channel.

Phase Coupling: Advanced techniques for modeling interphase momentum exchange, including drag force correlations appropriate for the flow regime encountered in the channel.

Turbulence Modeling in Multiphase Flows: Application of sophisticated turbulence models suitable for Eulerian multiphase simulations, addressing the complexities of phase-specific turbulence and its coupling.

Convergent-Divergent Geometry Effects: Analysis of how the changing cross-sectional area influences phase distribution, velocities, and pressure gradients for both phases.

Advanced Boundary Conditions: Setup of inlet conditions for both phases, including volume fractions and velocities, as well as appropriate outlet conditions that account for multiphase effects.

Pressure-Velocity Coupling: Implementation of phase-coupled SIMPLE or PISO algorithms to handle the pressure-velocity coupling in the Eulerian framework.

Convergence Strategies: Advanced techniques for achieving and monitoring convergence in Eulerian multiphase simulations, including phase-specific under-relaxation factors and residual scaling.

Advanced Post-Processing for Eulerian Simulations: Utilization of ANSYS post-processing tools for detailed analysis of phase distributions, velocity fields, and pressure profiles along the channel, including advanced visualization techniques for multiphase flows.

Phase Separation and Mixing: Investigation of potential phase separation or mixing phenomena within the convergent and divergent sections of the channel.

This advanced-level training aims to enhance participants’ expertise in simulating and analyzing complex two-phase flows using the Eulerian model in ANSYS Fluent. It provides insights into the intricacies of multiphase fluid dynamics in variable geometry channels, preparing participants for real-world applications in various industries including oil and gas, chemical processing, and power generation.

The tutorial focuses on sophisticated setup, solving, and analysis phases of the CFD simulation. This approach allows students to master advanced Eulerian multiphase modeling techniques, apply complex turbulence models, and interpret detailed results in the context of engineering applications involving two-phase flows in convergent-divergent channels.

Participants will gain valuable experience in handling advanced CFD simulations involving Eulerian multiphase flows, equipping them with the skills needed for complex analysis in process engineering, particularly in the design and optimization of equipment involving two-phase flow through varying cross-sections.