Near-interface flow modeling in large-eddy simulation of two-phase turbulence
| Autor: | Joan Grau, Michael Dodd, Lluis Jofre, Ricardo Torres |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Direct numerical simulation
General Physics and Astronomy 02 engineering and technology 01 natural sciences Two-phase flow 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake 0203 mechanical engineering 0103 physical sciences Turbulència Fluid Flow and Transfer Processes Physics Turbulence Mechanical Engineering Isotropy Large-Eddy simulation Reynolds number Mechanics 020303 mechanical engineering & transports Flow (mathematics) Near-interface flow modeling symbols Dissipative system Large eddy simulation Enginyeria mecànica::Mecànica de fluids [Àrees temàtiques de la UPC] |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | The smallest hydrodynamic length scales in two-phase turbulence are located at the interface between phases, or fluids, as a result of two-way coupling phenomena. Typically, these interface-generated scales are several times smaller than the dissipative scales in the surrounding bulk flow identified by Kolmogorov’s 1941 theory. Consequently, to properly capture these interface-generated small scales with sufficiently fine resolutions, the computational cost of performing large-eddy simulations of two-phase turbulent flow increases significantly from its (single-phase) theoretical optimum and toward values on the order of the direct numerical simulation of turbulence. Therefore, to maintain the cost of scale- resolving approaches linear with respect to the Reynolds number, this work investigates the modeling of the small-scale fluid motions in the vicinity of the viscous near-interface region of two-phase turbulent flows. Given the resemblance between the flow structures in the near-interface regions and those found in the boundary layers of turbulent wall-bounded flow, the modeling methodology proposed is inspired by ideas developed for turbulent flows interacting with solid walls, but modified to capture slip-velocity effects between phases. The performance of the approach is a priori assessed by utilizing data from direct numerical simulations of decaying isotropic turbulence laden with droplets of super-Kolmogorov size, demonstrating its computational feasibility and potential for reducing the cost of large-eddy simulation studies of two-phase turbulence. |
| Databáze: | OpenAIRE |
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