An Eulerian–Eulerian–Lagrangian modeling of two-phase combustion

In simulating two-phase combustion, most Reynolds-averaged Navier–Stokes (RANS) simulation and large-eddy simulation (LES) used Eulerian–Lagrangian (E–L) modeling (Eulerian treatment of gas phase and Lagrangian treatment of particles/droplets) which needs much more computational time than the Euleri...

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Bibliographic Details
Published in:Theoretical and computational fluid dynamics 2023-12, Vol.37 (6), p.767-780
Main Author: Zhou, L. X.
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Combustion
Computation
Computational Science and Engineering
Computing time
Droplets
Eddies
Energy equation
Engineering
Engineering Fluid Dynamics
Fluid flow
Large eddy simulation
Modelling
Navier-Stokes equations
Oceanic eddies
Orbital velocity
Review
Reynolds averaged Navier-Stokes method
Simulation
Stresses
Turbulence
Vapor phases
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Summary:In simulating two-phase combustion, most Reynolds-averaged Navier–Stokes (RANS) simulation and large-eddy simulation (LES) used Eulerian–Lagrangian (E–L) modeling (Eulerian treatment of gas phase and Lagrangian treatment of particles/droplets) which needs much more computational time than the Eulerian–Eulerian (E–E) or two-fluid modeling. However, in the E–E modeling, the problem of how to reduce the computation time for poly-dispersed particles is encountered . To solve this problem, the present author proposed an Eulerian–Eulerian–Lagrangian (E–E–L) modeling of two-phase combustion for both RANS modeling and LES. The E–E–L modeling is an Eulerian treatment of gas phase and a combined Eulerian–Lagrangian treatment of particles/droplets, in which the particle velocity and concentration are solved by Eulerian modeling, and particle temperature and mass change due to reaction are solved by Lagrangian modeling. In this paper, a review is given for an E–E–L modeling of coal combustion, its application in RANS simulation and its possible application in LES. For E–E–L LES, an energy equation model of two-phase sub-grid scale (SGS) stresses accounting for the interaction between two-phase SGS stresses is suggested, and a second-order moment SGS (SOM-SGS) turbulence-chemistry model is adopted to simulate gas-phase reaction in two-phase combustion. These SGS models were separately assessed by comparison with experiments. Graphic abstract
ISSN:0935-4964
1432-2250
DOI:10.1007/s00162-023-00666-x