Special Issue "CFD Modeling and Multiphase Flows"

Deadline: 01 September 2019 (closed)
Guest Editors
Lennon Ó Náraigh, University College Dublin, Ireland.
Prashant Valluri, University of Edinburgh, UK.

Summary

The symposium is focused on the computational modelling of instabilities and turbulence in separated two phase flow. As such, contributions from researchers working on such flows are invited, including but not limited to the following aspects:
1) Recent algorithmic developments in level-set, volume-of-fluid, Diffuse-Interface, Lattice-Boltzmann, Front Tracking; 
2) Recent developments in the understanding of the instabilities in such fluids, e.g. linear and nonlinear instability; 
3) High-performance computing aspects, including possible direction of research in the context of exascal computing;
4) Postprocessing and model validation, including Statistical Learning and Uncertainty Quantification; 
5) Input from experimentalists working in the area; 
6) Industrial and technical applications of two-phase flows.

Further contributions from multiphase flow broadly are also welcomed, especially if they can provide insight in the above main topical areas. 


Keywords
computational fluid dynamics, industrial and technical application of two-phase flows

Published Papers
  • Numerical Fluid Flow Modelling in Multiple Fractured Porous Reservoirs
  • Abstract This paper compares the fluid flow phenomena occurring within a fractured reservoir for three different fracture models using computational fluid dynamics. The effect of the fracture-matrix interface condition is studied on the pressure and velocity distribution. The fracture models were compared based on the variation in pressure and permeability conditions. The model was developed for isotropic and anisotropic permeability conditions. The results suggest that the fracture aperture can have a drastic effect on fluid flow. The porous fracture-matrix interface condition produces more realistic transport of fluids. By increasing the permeability in the isotropic porous matrix, the pressure drop was significantly… More
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  • Heat and Mass Transfer Characteristics of Alkali Metals in a Combined Wick of High-Temperature Heat Pipe
  • Abstract To study the heat and mass transfer characteristics of alkali metals in a combined porous wick in high-temperature heat pipes, a three-dimensional (3-D) numerical model is constructed by using the finite volume method, Darcy’s theory, and the theory of local thermal equilibrium. The research finds that the pressure drop of fluids flowing through a combined porous wick exhibits an increasing trend with increasing flow velocity at the inlet and with decreasing permeability of the porous media; a combined porous wick of lower porosity and permeability and larger fluid velocity at the inlet is found to have a less uniformly distributed… More
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  • Numerical Modelling of Proppant Transport in Hydraulic Fractures
  • Abstract The distribution of proppant injected in hydraulic fractures significantly affects the fracture conductivity and well performance. The proppant transport in thin fracturing fluid used during hydraulic fracturing in the unconventional reservoirs is considerably different from fracturing fluids in the conventional reservoir due to the very low viscosity and quick deposition of the proppants. This paper presents the development of a threedimensional Computational Fluid Dynamics (CFD) modelling technique for the prediction of proppant-fluid multiphase flow in hydraulic fractures. The proposed model also simulates the fluid leak-off behaviour from the fracture wall. The Euler-Granular and CFD-Discrete Element Method (CFD-DEM) multiphase modelling approach… More
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  • Study on Dynamic Prediction of Two-Phase Pipe Flow in Inclined Wellbore with Middle and High Yield
  • Abstract Gas-liquid two-phase flow is ubiquitous in the process of oil and gas exploitation, gathering and transportation. Flow pattern, liquid holdup and pressure drop are important parameters in the process of gas-liquid two-phase flow, which are closely related to the smooth passage of the two-phase fluid in the pipe section. Although Mukherjee, Barnea and others have studied the conventional viscous gas-liquid two-phase flow for a long time at home and abroad, the overall experimental scope is not comprehensive enough and the early experimental conditions are limited. Therefore, there is still a lack of systematic experimental research and wellbore pressure for gas-liquid… More
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  • On the Liquid-Vapor Phase-Change Interface Conditions for Numerical Simulation of Violent Separated Flows
  • Abstract Numerous models have been proposed in the literature to include phase change into numerical simulations of two-phase flows. This review paper presents the modeling options that have been taken in order to obtain a model for violent separated flows with application to sloshing wave impacts. A relaxation model based on linear non-equilibrium thermodynamics has been chosen to compute the rate of phase change. The integration in the system of partial differential equations is done through a non-conservative advection term. For each of these modelling choices, some alternative models from the literature are presented and discussed. The theoretical framework for all… More
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  • Linear and Nonlinear Stability Analysis in Microfluidic Systems
  • Abstract In this article we use analytical and numerical modeling to describe parallel viscous two-phase flows in microchannels. The focus is on idealized two-dimensional geometries, with a view to validating the various methodologies for future work in three dimensions. In the first instance, we use analytical Orr-Sommerfeld theory to describe the linear instability which governs the formation of small-amplitude waves in such systems. We then compare the results of this analysis with an in-house Computational Fluid Dynamics (CFD) solver called TPLS. Excellent agreement between the theoretical analysis and TPLS is obtained in the regime of small-amplitude waves. We continue the numerical… More
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