COMPUTATIONAL SIMULATION OF TURBULENT FLOW USING AN IMPROVED PANS MODEL AT HIGH REYNOLDS NUMBERS: ROTATING CYLINDER WITH A FIXED SPIN RATIO

H.J. Kim; W. Seok; S.B. Lee

doi:10.6112/kscfe.2024.29.4.117

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2024 Vol.29, Issue 4 Preview Page Next Page

Original Article

COMPUTATIONAL SIMULATION OF TURBULENT FLOW USING AN IMPROVED PANS MODEL AT HIGH REYNOLDS NUMBERS: ROTATING CYLINDER WITH A FIXED SPIN RATIO 개선된 PANS 난류 모델 기반 높은 레이놀즈수 난류 유동 수치 모사: 회전율이 고정된 회전실린더

31 December 2024. pp. 117-127

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Abstract

Flow around a rotating cylinder was analyzed using an improved Partially Averaged Navier-Stokes(PANS) model within a Reynolds number(Re) range of 10⁴ to 10⁶. To observe the flow characteristics of the rotating cylinder over a wide range of Reynolds numbers, the rotation rate, which represents the ratio of rotational flow to free flow, was fixed at 1. Compared to the fixed cylinder where a sharp drop in the drag coefficient is observed, the rotating cylinder showed a monotonic decrease in both drag and lift coefficients as the Reynolds number increased on a logarithmic scale. With the application of counter-clockwise rotation, the upper surface of the cylinder experienced a local deceleration flow due to the flow opposing the free stream. This caused the separation point to move upstream compared to that of the fixed cylinder, directing the flow relatively outward from the cylinder. Conversely, on the lower surface of the cylinder, an additional flow in the same direction as the free stream resulted in partial acceleration, delaying the separation point further downstream and causing the flow to converge inward toward the cylinder. With increasing Re, the separation point on the lower surface remained nearly constant, whereas that on the upper surface gradually moved downstream, with the flow direction increasingly converging inward. Therefore, the vortices formed directly behind the cylinder transitioned from asymmetric flow to a nearly symmetric flow pattern. However, further downstream, deflection is still observed despite the increase in Re.

Keywords

Rotating cylinder

Sub-critical regime

Critical regime

hybridPANS

OpenFOAM

키워드

회전하는 실린더

아임계 영역

임계 영역

하이브리드 PANS

오픈폼

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Information

Publisher :Korean Society for Computational Fluids Engineering
Publisher(Ko) :한국전산유체공학회
Journal Title :Journal of Computational Fluids Engineering
Journal Title(Ko) :한국전산유체공학회지
Volume : 29
No :4
Pages :117-127
Received Date : 2024-09-04
Revised Date : 2024-09-26
Accepted Date : 2024-09-26
DOI :https://doi.org/10.6112/kscfe.2024.29.4.117

Journal of Computational Fluids Engineering ISSN:1598-6071(Print) 3022-6252(Online) 한국전산유체공학회지

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