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Numerical investigation of turning diffuser performance: validation and verification-model II

Nordin, Normayati and Abdul Karim, Zainal Ambri and Othman, Safiah and R. Raghavan, Vijay (2015) Numerical investigation of turning diffuser performance: validation and verification-model II. In: 3rd Biannual Post Graduate Conference, 14th - 16th May 2015, Universiti Teknologi PETRONAS, Tronoh.

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Abstract

This paper aims to validate the numerical method used to intensively study the performance of turning diffuser. A 3-D turning diffuser of area ratio (AR=2.16), outlet inlet configurations (W2/W1=1.50, X2/X1=1.44) and inner wall length (Lin/W1=3.99) operated at inflow Reynolds numbers, Rein = 5.786 x 104- 1.775 x 105 was considered. Grid with appropriate size, y+ was occupied relatively in dense close to the walls. The quality and independency of grid was examined. The applicability of k-  turbulence models, i.e. standard k-  (ske), renormalization group k-  (rngke) and realizable k-  (rke) by means of adopting different near wall treatments to simulate the actual cases, was assessed. The enhanced wall treatment, y+  1.2-1.7 adopted ske appeared as the best validated model, producing minimal deviation with comparable flow structures to the actual cases.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: CFD; turning diffuser; validation
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Energy and Thermofluid Engineering
Depositing User: Mrs. Normayati Nordin
Date Deposited: 09 Dec 2015 06:57
Last Modified: 09 Dec 2015 06:57
URI: http://eprints.uthm.edu.my/id/eprint/7398
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