Journal ArticleDOI
Turbulence Modeling of Internal Combustion Engines Using RNG κ-ε Models
Z. Han,Rolf D. Reitz +1 more
TLDR
In this article, the RNG κ-e turbulence model derived by Yakhot and Orszag (1986) based on the Renormalization Group theory has been modified and applied to variable-density engine flows in the present study.Abstract:
The RNG κ-e turbulence model derived by Yakhot and Orszag (1986) based on the Renormalization Group theory has been modified and applied to variable-density engine flows in the present study. The original RNG-based turbulence transport approximations were developed formally for an incompressible flow. In order to account for flow compressibility the RNG e-equation is modified and closed through an isotropic rapid distortion analysis. Computations were made of engine compressing/expanding flows and the results were compared with available experimental observations in a production diesel engine geometry. The modified RNG κ-e model was also applied to diesel spray combustion computations. It is shown that the use of the RNG model is warranted for spray combustion modeling since the ratio of the turbulent to mean-strain time scales is appreciable due to spray-generated mean flow gradients, and the model introduces a term to account for these effects. Large scale flow structures are predicted which ar...read more
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ReportDOI
KIVA-3V: A Block-Structured KIVA Program for Engines with Vertical or Canted Valves
TL;DR: KIVA-3V as discussed by the authors is an extended version of KIVA3 that can model any number of vertical or canted valves in the cylinder head of an internal combustion (IC) engine.
Journal ArticleDOI
Renormalization group analysis of turbulence
TL;DR: The renormalization-group (RG) analysis of turbulence, based primarily on KG Wilson's coarse-graining procedure, leads to suggestive results for turbulence coefficients and models as discussed by the authors.
Journal ArticleDOI
A temperature wall function formulation for variable-density turbulent flows with application to engine convective heat transfer modeling
Zhiyu Han,Rolf D. Reitz +1 more
TL;DR: In this paper, a temperature wall function was derived for variable-density turbulent flows that are commonly found in internal combustion engines, and the results showed that the effects of unsteadiness and heat release due to combustion were insignificant for the cases considered.
Journal ArticleDOI
Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using In-Cylinder Fuel Blending
References
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Book
Internal combustion engine fundamentals
TL;DR: In this article, the authors describe real engine flow and combustion processes, as well as engine operating characteristics and their operation, including engine design and operating parameters, engine characteristics, and operating characteristics.
Journal ArticleDOI
Renormalization group analysis of turbulence I. Basic theory
Victor Yakhot,Steven A. Orszag +1 more
TL;DR: In this article, a dynamic renormalization group (RNG) method for hydrodynamic turbulence was developed, which uses dynamic scaling and invariance together with iterated perturbation methods, allowing us to evaluate transport coefficients and transport equations for the large scale (slow) modes.
Journal ArticleDOI
On mathematical modeling of turbulent combustion with special emphasis on soot formation and combustion
B F Magnussen,Bjørn H. Hjertager +1 more
TL;DR: In this paper, a model for the rate of combustion which takes into account the intermittent appearance of reacting species in turbulent flames is presented, which is applicable to premixed as well as diffusion flames.
Journal ArticleDOI
Development of turbulence models for shear flows by a double expansion technique
TL;DR: In this article, a two-equation model and Reynolds stress transport model are developed for turbulent shear flows and tested for homogeneous shear flow and flow over a backward facing step.
Mathematical Models of turbulence
Brian Launder,D. B. Spalding +1 more
TL;DR: In this article, turbulence and melange models are used to model models of mathematical models for fluides reference record created on 2005-11-18, modified on 2016-08-08.