منابع مشابه
Flame length measurements of the turbulent plume
A steady source of buoyancy creates a plume. Experi mental and theoretical studies of plumes have been mainly concerned with the far-field (self-similar) velocity and den sity profiles. •-3 Yet in many practical situations, knowledge regarding the rate of molecular scale mixing of the buoyant fluid with its environment is needed. This is especially true in the context of atmospheric studies, ...
متن کاملParallel simulations of unsteady turbulent flames
Tie-accurate simulation of turbulent flames in high Reynolds number flows is a challenging task since both fluid dynamics and combustion must be modeled accurately. To numerically simulate this phenomenon, very large computer resources (both time and memory) are required. Although current vector supercomputers are capable of providing adequate xesources for simulations of this nature, the high ...
متن کاملValidation of unsteady flamelet models for non-premixed turbulent combustion with intermittency
Flamelets play an important role as subgrid models in large eddy simulations of turbulent flames: they are based on a one-dimensional steady asymptotic solution for the flame. The focus of the present study is to validate their use when unsteadiness and multidimensional effects are present, as to be expected for turbulent flows. To shortcut the prohibitively expansive step of solving the comple...
متن کاملDes, Hybrid Rans/les and Pans Models for Unsteady Separated Turbulent Flow Simulations
This paper presents computational results for two DES (Detached Eddy Simulation), one hybrid RANS (Reynolds Averaged Navier-Stokes)/ LES (Large Eddy Simulation) and some preliminary results from PANS (Partially Averaged Navier-Stokes) turbulence for simulation of unsteady separated turbulent flows. The models are implemented in a full 3-D Navier Stokes solver and are based on the twoequation k-...
متن کاملDES and Hybrid RANS/LES models for unsteady separated turbulent flow predictions
This paper proposes two DES (Detached Eddy Simulation) model and one hybrid RANS (Reynolds Averaged Navier-Stokes)/ LES (Large Eddy Simulation) model for the simulations of unsteady separated turbulent flows. The two-equation k-ε based models are implemented in a full 3-D Navier Stokes solver and simulations are carried out using a 3 order Roe scheme. The predictions of the models are compared ...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2012
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2012.77