Verification and validation in CFD for a free-surface gas-liquid flow in channels

Abstract

-This work deals with experimental and numerical studies of a 3-D transient free-surface two-phase flow in a bench-scale channel flow. The aim was to determine how well the homogeneous model can predict the fluid dynamics behavior and to validate the model. The model was validated with experimental data acquired for two hydrodynamic situations. The mathematical model was based on the mass conservation equations for liquid and gas phases and on the momentum conservation equation for the mixture, assuming interpenetrating, continuum and homogeneous hypotheses. Turbulence has been considered for the mixture through the standard k-ε model. The numerical methods were the finite volume method with pressure-velocity coupling and a numerical grid on a generalized Cartesian coordinate system. Good qualitative and quantitative agreements were found for both cases, making the prediction of the fluid dynamics behavior quite robust.

Análisis de los efectos hidráulicos asociados a la colocación de una compuerta inflable sobre un aliviadero mediante modelación física y numérica (CFD)

“…Se implementa el modelo k-ε, ya que aunque el k-ω SST (del inglés, Shear Stress Transport) es la opción más completa para modelar flujos turbulentos hoy día (Bardina et al, 1997), el modelo k-ε consiente un mallado menos fino y ha probado ser consistente en otros estudios desarrollados por Karimpour et al (2011), Feurich y Olsen (2012), Soares et al (2013), entre otros. Concretamente, se adopta con funciones de pared escalables, que modelizan el flujo próximo a la pared utilizando funciones que fuerzan perfiles logarítmicos en la capa límite.…”

Production of Anhydrous Ethyl Alcohol from the Hydrolysis and Alcoholic Fermentation of Corn Starch

“…(2011) evaluated the microscopic behaviour of the flow of liquid and vapour phases in the plates, mainly in terms of interaction between the phases, and related them to the separation transfer efficiency. Soares et al (2013) related the flow behaviour in liquid stream flow ducts to understand the phenomenological behaviour of mass transfer in distillation columns with a tray. For Zöldy et al (2007) and Zöldy (2011), ethanol is a renewable resource that could partially contribute to global warming concerns.…”

Estudo Da Distribuição E Evolução Da Concentração De Dióxido De Carbono Em Uma Sala De Aula

“…É uma ferramenta simples e versátil, cada vez mais utilizada devido à rapidez e ao baixo custo de obtenção de resultados, quando comparada a métodos experimentais. Possibilita a alteração da geometria e dos parâmetros de projeto sem custos associados a experimentos no laboratório ou no campo (Soares et al, 2013), sendo esta a principal vantagem da sua utilização.…”