| Evaluation of URANS Turbulence Models through the Prediction of the Flow around a Circular Cylinder |
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Minjae Kim, Jihwan Shin, Laeun Kwon, Kurnchul Lee |
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The 6th Research and Development Institute, Agency for Defense Development |
| 원형 실린더 주위의 유동해석을 통한 URANS 난류 모델 성능 비교 |
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김민재, 신지환, 권래언, 이건철 |
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국방과학연구소 제6기술연구본부 |
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| Abstract |
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In the present study, the flow around a circular cylinder at $Re=3.6{ ime}10^6$ is numerically simulated using URANS approach. The objective of this study is to evaluate the turbulence models(Realizable k-${varepsilon}$, RNG k-${varepsilon}$) through the prediction of the unsteady flow characteristics around the cylinder. The time-averaged drag coefficients and vortex shedding phenomenon in the wake region are compared to available experimental data and other numerical results. The simulation with Realizable k-${varepsilon}$ model is found to be more dissipative due to large eddy viscosity predicted in the wake region while the simulation with RNG k-${varepsilon}$ model predicts a complex vortex shedding phenomenon with more coherent structures realistically. |
| Key Words:
Turbulence Model, Vortex Shedding, Eddy Viscosity, Coherent Structure |
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