Large eddy simulation of dilute reacting sprays: Droplet evaporation and scalar mixing

2013 ◽  
Vol 160 (10) ◽  
pp. 2048-2066 ◽  
Author(s):  
Santanu De ◽  
Seung Hyun Kim
Keyword(s):  
Large Eddy Simulation ◽  
Droplet Evaporation ◽  
Scalar Mixing ◽  
Eddy Simulation ◽  
Large Eddy

Large Eddy Simulation of Scalar Mixing in a Coaxial Confined Jet

2006 ◽  
Vol 77 (1-4) ◽  
pp. 205-227 ◽  
Author(s):  
M. Dianat ◽  
Z. Yang ◽  
D. Jiang ◽  
J. J. McGuirk
Keyword(s):  
Large Eddy Simulation ◽  
Scalar Mixing ◽  
Eddy Simulation ◽  
Large Eddy

scholarly journals On the application of the classic Kessler and Berry schemes in Large Eddy Simulation models with a particular emphasis on cloud autoconversion, the onset time of precipitation and droplet evaporation

1998 ◽  
Vol 16 (5) ◽  
pp. 628-637 ◽  
Author(s):  
S. Ghosh ◽  
P. R. Jonas
Keyword(s):  
Large Eddy Simulation ◽  
Onset Time ◽  
Simulation Models ◽  
Droplet Evaporation ◽  
Atmospheric Composition ◽  
Accurate Estimation ◽  
Eddy Simulation ◽  
Deep Model ◽  
Composition And Structure ◽  
Large Eddy

Abstract. Many Large Eddy Simulation (LES) models use the classic Kessler parameterisation either as it is or in a modified form to model the process of cloud water autoconversion into precipitation. The Kessler scheme, being linear, is particularly useful and is computationally straightforward to implement. However, a major limitation with this scheme lies in its inability to predict different autoconversion rates for maritime and continental clouds. In contrast, the Berry formulation overcomes this difficulty, although it is cubic. Due to their different forms, it is difficult to match the two solutions to each other. In this paper we single out the processes of cloud conversion and accretion operating in a deep model cloud and neglect the advection terms for simplicity. This facilitates exact analytical integration and we are able to derive new expressions for the time of onset of precipitation using both the Kessler and Berry formulations. We then discuss the conditions when the two schemes are equivalent. Finally, we also critically examine the process of droplet evaporation within the framework of the classic Kessler scheme. We improve the existing parameterisation with an accurate estimation of the diffusional mass transport of water vapour. We then demonstrate the overall robustness of our calculations by comparing our results with the experimental observations of Beard and Pruppacher, and find excellent agreement.Key words. Atmospheric composition and structure · Cloud physics and chemistry · Pollution · Meteorology and atmospheric dynamics · Precipitation

scholarly journals Large Eddy Simulation of Scalar Mixing in Jet in a Cross-Flow

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Asela Uyanwaththa ◽  
Weeratunge. Malalasekera ◽  
Graham Hargrave ◽  
Mark Dubal
Keyword(s):  
Experimental Data ◽  
Velocity Field ◽  
Large Eddy Simulation ◽  
Cross Flow ◽  
Passive Scalar ◽  
Scalar Mixing ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Fuel Mixing ◽  
Good Agreement

Jet in a cross-flow (JICF) is a flow arrangement found in many engineering applications, especially in gas turbine air–fuel mixing. Understanding of scalar mixing in JICF is important for low NOx burner design and operation, and numerical simulation techniques can be used to understand both spatial and temporal variation of air–fuel mixing quality in such applications. In this paper, mixing of the jet stream with the cross-flow is simulated by approximating the jet flow as a passive scalar and using the large eddy simulation (LES) technique to simulate the turbulent velocity field. A posteriori test is conducted to assess three dynamic subgrid scale models in modeling jet and cross-flow interaction with the boundary layer flow field. Simulated mean and Reynolds stress component values for velocity field and concentration fields are compared against experimental data to assess the capability of the LES technique, which showed good agreement between numerical and experimental results. Similarly, time mean and standard deviation values of passive scalar concentration also showed good agreement with experimental data. In addition, LES results are further used to discuss the scalar mixing field in the downstream mixing region.

Implicit large eddy simulation of a scalar mixing layer in fractal grid turbulence

2016 ◽  
Vol 91 (7) ◽  
pp. 074007 ◽  
Author(s):  
Tomoaki Watanabe ◽  
Yasuhiko Sakai ◽  
Kouji Nagata ◽  
Yasumasa Ito ◽  
Toshiyuki Hayase
Keyword(s):  
Large Eddy Simulation ◽  
Mixing Layer ◽  
Grid Turbulence ◽  
Scalar Mixing ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Implicit Large Eddy Simulation

Implicit large-eddy simulation of passive scalar mixing in statistically stationary isotropic turbulence

2013 ◽  
Vol 25 (2) ◽  
pp. 025101 ◽  
Author(s):  
A. J. Wachtor ◽  
F. F. Grinstein ◽  
C. R. DeVore ◽  
J. R. Ristorcelli ◽  
L. G. Margolin
Keyword(s):  
Large Eddy Simulation ◽  
Isotropic Turbulence ◽  
Passive Scalar ◽  
Scalar Mixing ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Implicit Large Eddy Simulation
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