scholarly journals A-priori evaluation of data-driven models for large-eddy simulations in natural convection

2020 ◽  
Author(s):  
Liyuan Liu ◽  
Chitrarth Lav ◽  
Richard Sandberg
Keyword(s):  
Natural Convection ◽  
A Priori ◽  
Large Eddy Simulations ◽  
Data Driven ◽  
Large Eddy ◽  
Evaluation Of Data

scholarly journals A-Priori Validation of Scalar Dissipation Rate Models for Turbulent Non-Premixed Flames

2020 ◽  
Author(s):  
M. P. Sitte ◽  
C. Turquand d’Auzay ◽  
A. Giusti ◽  
E. Mastorakos ◽  
N. Chakraborty
Keyword(s):  
Dissipation Rate ◽  
A Priori ◽  
Turbulent Flames ◽  
Large Eddy Simulations ◽  
Moment Closure ◽  
Scalar Dissipation ◽  
Combustion Model ◽  
Scalar Dissipation Rate ◽  
Jet Flame ◽  
Large Eddy

Abstract The modelling of scalar dissipation rate in conditional methods for large-eddy simulations is investigated based on a priori direct numerical simulation analysis using a dataset representing an igniting non-premixed planar jet flame. The main objective is to provide a comprehensive assessment of models typically used for large-eddy simulations of non-premixed turbulent flames with the Conditional Moment Closure combustion model. The linear relaxation model gives a good estimate of the Favre-filtered scalar dissipation rate throughout the ignition with a value of the related constant close to the one deduced from theoretical arguments. Such value of the constant is one order of magnitude higher than typical values used in Reynolds-averaged approaches. The amplitude mapping closure model provides a satisfactory estimate of the conditionally filtered scalar dissipation rate even in flows characterised by shear driven turbulence and strong density variation.

A-priori testing of alpha regularisation models as subgrid-scale closures for large-eddy simulations

2013 ◽  
Vol 14 (6) ◽  
pp. 1-20 ◽  
Author(s):  
Denis F. Hinz ◽  
Tae-Yeon Kim ◽  
James J. Riley ◽  
Eliot Fried
Keyword(s):  
A Priori ◽  
Large Eddy Simulations ◽  
Subgrid Scale ◽  
Large Eddy

scholarly journals Lattice Boltzmann simulation of turbulent natural convection in tall enclosures

2015 ◽  
Vol 19 (1) ◽  
pp. 155-166 ◽  
Author(s):  
Hasan Sajjadi ◽  
Reza Kefayati
Keyword(s):  
Nusselt Number ◽  
Natural Convection ◽  
Lattice Boltzmann ◽  
Average Nusselt Number ◽  
Large Eddy Simulations ◽  
Turbulent Natural Convection ◽  
Aspect Ratios ◽  
Lattice Boltzmann Simulation ◽  
Large Eddy ◽  
Rayleigh Numbers

In this paper Lattice Boltzmann simulation of turbulent natural convection with large-eddy simulations (LES) in tall enclosures which is filled by air with Pr=0.71 has been studied. Calculations were performed for high Rayleigh numbers (Ra=107-109) and aspect ratios change between 0.5 to 2 (0.5<AR<2). The present results are validated by finds of an experimental research at Ra=1.58x109. Effects of the aspect ratios in different Rayleigh numbers are displayed on streamlines, isotherm counters, vertical velocity and temperature at the middle of the cavity, local Nusselt number and average Nusselt number. The average Nusselt number increases with the augmentation of Rayleigh numbers. The increment of the aspect ratio causes heat transfer to decline in different Rayleigh numbers.

Large Eddy Simulations on a natural convection boundary layer at Pr = 0.71 and 0.025

2019 ◽  
Vol 353 ◽  
pp. 110231
Author(s):  
Agustín Villa Ortiz ◽  
Lilla Koloszar ◽  
Philippe Planquart
Keyword(s):  
Boundary Layer ◽  
Natural Convection ◽  
Large Eddy Simulations ◽  
Convection Boundary Layer ◽  
Large Eddy ◽  
Convection Boundary

A priori tests of a new dynamic subgrid‐scale model for finite‐difference large‐eddy simulations

1995 ◽  
Vol 7 (11) ◽  
pp. 2831-2847 ◽  
Author(s):  
M. V. Salvetti ◽  
S. Banerjee
Keyword(s):  
Finite Difference ◽  
A Priori ◽  
Large Eddy Simulations ◽  
Scale Model ◽  
Subgrid Scale ◽  
Large Eddy ◽  
Subgrid Scale Model
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