Staff View: The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser

The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser

Diffusing S-shaped ducts are critical components in modern vehicle, primarily employed in directing the airflow to the engine. It links the air box and the engine in a very restricted place. The air flow through an S-duct is complex in nature, which perhaps includes boundary layer separation, second...

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Main Authors:	Abd. Halim, M. A., Mohd., N. A. R. N., Mohd. Nasir, M. N., Dahalan, M. N.
Format:	Article
Language:	English
Published:	Universiti Malaysia Pahang 2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/79724/1/NikMohd2018_TheEvaluationofkandkTurbulence.pdf http://eprints.utm.my/id/eprint/79724/ http://dx.doi.org/10.15282/ijame.15.2.2018.2.0399
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id	my.utm.79724
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spelling	my.utm.797242019-01-28T06:37:52Z http://eprints.utm.my/id/eprint/79724/ The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser Abd. Halim, M. A. Mohd., N. A. R. N. Mohd. Nasir, M. N. Dahalan, M. N. TJ Mechanical engineering and machinery Diffusing S-shaped ducts are critical components in modern vehicle, primarily employed in directing the airflow to the engine. It links the air box and the engine in a very restricted place. The air flow through an S-duct is complex in nature, which perhaps includes boundary layer separation, secondary flow, and total pressure loss effects that influences the engine performance. In this work, the flow and performance of S-shaped duct was predicted and analysed using computational fluid dynamics. The main objective is to evaluate the performance of the realizable k-ε and k-ω SST models qualitatively and quantitatively in modelling flow of a highly bend duct where a high stress distorted flow may have developed in proximity the duct wall leading to stall. CFD computations were performed for the flow entering the diffuser at Reynolds number of 80,000 cases. The results obtained suggested that the k-ω SST model reasonably predicts the flow characteristics qualitatively and quantitatively. The realizable k-ε turbulence model however poorly captures the actual magnitudes of the calculated flow features. The growth of the stream-wise velocity profile was calculated at three stream-wise stations and point out a smooth down the interior profile of the divergent section. An extreme flow distortion and a shift of the region of flow with the highest velocity were developed toward the outer wall of the first bend of the diffuser. A significant pressure recovery potential with no flow separation arise over the diffuser tube range was predicted well by the simulations. Universiti Malaysia Pahang 2018 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/79724/1/NikMohd2018_TheEvaluationofkandkTurbulence.pdf Abd. Halim, M. A. and Mohd., N. A. R. N. and Mohd. Nasir, M. N. and Dahalan, M. N. (2018) The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser. International Journal of Automotive and Mechanical Engineering, 15 (2). pp. 5161-5178. ISSN 2229-8649 http://dx.doi.org/10.15282/ijame.15.2.2018.2.0399 DOI:10.15282/ijame.15.2.2018.2.0399
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Abd. Halim, M. A. Mohd., N. A. R. N. Mohd. Nasir, M. N. Dahalan, M. N. The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser
description	Diffusing S-shaped ducts are critical components in modern vehicle, primarily employed in directing the airflow to the engine. It links the air box and the engine in a very restricted place. The air flow through an S-duct is complex in nature, which perhaps includes boundary layer separation, secondary flow, and total pressure loss effects that influences the engine performance. In this work, the flow and performance of S-shaped duct was predicted and analysed using computational fluid dynamics. The main objective is to evaluate the performance of the realizable k-ε and k-ω SST models qualitatively and quantitatively in modelling flow of a highly bend duct where a high stress distorted flow may have developed in proximity the duct wall leading to stall. CFD computations were performed for the flow entering the diffuser at Reynolds number of 80,000 cases. The results obtained suggested that the k-ω SST model reasonably predicts the flow characteristics qualitatively and quantitatively. The realizable k-ε turbulence model however poorly captures the actual magnitudes of the calculated flow features. The growth of the stream-wise velocity profile was calculated at three stream-wise stations and point out a smooth down the interior profile of the divergent section. An extreme flow distortion and a shift of the region of flow with the highest velocity were developed toward the outer wall of the first bend of the diffuser. A significant pressure recovery potential with no flow separation arise over the diffuser tube range was predicted well by the simulations.
format	Article
author	Abd. Halim, M. A. Mohd., N. A. R. N. Mohd. Nasir, M. N. Dahalan, M. N.
author_facet	Abd. Halim, M. A. Mohd., N. A. R. N. Mohd. Nasir, M. N. Dahalan, M. N.
author_sort	Abd. Halim, M. A.
title	The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser
title_short	The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser
title_full	The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser
title_fullStr	The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser
title_full_unstemmed	The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser
title_sort	evaluation of k-ε and k-ω turbulence models in modelling flows and performance of s-shaped diffuser
publisher	Universiti Malaysia Pahang
publishDate	2018
url	http://eprints.utm.my/id/eprint/79724/1/NikMohd2018_TheEvaluationofkandkTurbulence.pdf http://eprints.utm.my/id/eprint/79724/ http://dx.doi.org/10.15282/ijame.15.2.2018.2.0399
_version_	1643658274907619328
score	13.211869

The evaluation of k-ε and k-ω turbulence models in modelling flows and performance of S-shaped diffuser

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