NDLI: A priori subgrid scale modeling for a droplet laden temporal mixing layer

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A priori subgrid scale modeling for a droplet laden temporal mixing layer

Content Provider	NASA Technical Reports Server (NTRS)
Author	Okongo, Nora Bellan, Josette
Copyright Year	2000
Description	Subgrid analysis of a transitional temporal mixing layer with evaporating droplets has been performed using a direct numerical simulation (DNS) database. The DNS is for a Reynolds number (based on initial vorticity thickness) of 600, with droplet mass loading of 0.2. The gas phase is computed using a Eulerian formulation, with Lagrangian droplet tracking. Since Large Eddy Simulation (LES) of this flow requires the computation of unfiltered gas-phase variables at droplet locations from filtered gas-phase variables at the grid points, it is proposed to model these by assuming the gas-phase variables to be given by the filtered variables plus a correction based on the filtered standard deviation, which can be computed from the sub-grid scale (SGS) standard deviation. This model predicts unfiltered variables at droplet locations better than simply interpolating the filtered variables. Three methods are investigated for modeling the SGS standard deviation: Smagorinsky, gradient and scale-similarity. When properly calibrated, the gradient and scale-similarity methods give results in excellent agreement with the DNS.
File Size	505913
File Format	PDF
Language	English
Publisher Date	2000-01-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Thermodynamics Position Location Direct Numerical Simulation Calibrating Vapor Phases Reynolds Number Evaporation Scale Ratio Data Bases Drops Liquids Thickness Interpolation Analogies Standard Deviation Models Gradients Computational Grids Lagrangian Function Mixing Layers Fluids Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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