A Study of Applicability of a RNG $\small{k-\varepsilon}$ Model

Title & Authors
A Study of Applicability of a RNG $\small{k-\varepsilon}$ Model
Yang, Hui-Cheon; Yu, Hong-Seon;

Abstract
In this study, the applicability of the RNG k-.epsilon. model to the analysis of the complex flows is studied. The governing equations based on a non-orthogonal coordinate formulation with Cartesian velocity components are used and discretized by the finite volume method with non-staggered variable arrangements. The predicted results using the RNG k-.epsilon. model of three complex flows, i.e., the flow over a backward-facing step and a blunt flat plate, the flow around a 2D model car are compared to these from the standard k-.epsilon. model and experimental data. That of the unsteady axisymmetric turbulent flow within a cylinder of reciprocating model engine including port/valve assembly and the spray characteristics within a chamber of direct injection model engine are compared to these from the standard k-.epsilon. model and experimental data. The results of reattachment length, separated eddy size, average surface pressure distribution using the RNG k-.epsilon. model show more reasonable trends comparing with the experimental data than those using the modified k-.epsilon. model. Although the predicted rms velocity using the modified k-.epsilon. model is lower considerably than the experimental data in incylinder flow with poppet valve, predicted axial and radial velocity distributions at the valve exit and in-cylinder region show good agreements with the experimental data. The spray tip penetration predicted using the RNG k-.epsilon. model is more close to the experimental data than that using the modified k-.epsilon. model. The application of the RNG k-.epsilon. model seems to have some potential for the simulations of the unsteady turbulent flow within a port/valve-cylinder assembly and the spray characteristics over the modified k-.epsilon. model.
Keywords
Renormalization Group Method;Modified $\small{k-varepsilon}$ Model;RNG $\small{k-\varepsilon}$Model;FVM;Non-Orthogonal Coordinate;Non-Staggered Grid;
Language
Korean
Cited by
1.
분류층 연소기내의 유동해석,양희천;박상규;정동화;

한국마린엔지니어링학회지, 2001. vol.25. 6, pp.1308-1316
2.
계단형 슬롯출구의 높낮이 변화에 따른 2차원 막냉각 특성,손창호;김태묵;이근식;

대한기계학회논문집B, 2005. vol.29. 1, pp.46-54
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