축대칭체 주위 고 레이놀즈수 유동에 대한 수치해석
Numerical Analysis of High-Reynolds-Number Flow around Axisymmetric Body
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In this paper, numerical analysis based on the RANS equation and the Realizable turbulence model is carried out for flows around an axisymmetric body at three Reynolds numbers(1.22×107, 1.0×108, 1.5×108) and the numerical results are compared with experiments data. Computed velocity distributions agree well with experiments as the Reynolds number increases. Pressure distributions agree well with the results of the potential flow except the tail region but differ from experiments for the parallel middle body as well as tail region. Pressure gradients show a good agreement with those of potential flow and experiment except the tail region. Friction coefficients show that the numerical results generally are lower than the experimental results estimated from the measured velocity. The difference of friction coefficients between the calculation and the experiment increases with growing of a boundary layer.
Abstract
In this paper, numerical analysis based on the RANS equation and the Realizable turbulence model is carried out for flows around an axisymmetric body at three Reynolds numbers(1.22×107, 1.0×108, 1.5×108) and the numerical results are compared with experiments data. Computed velocity distributions agree well with experiments as the Reynolds number increases. Pressure distributions agree well with the results of the potential flow except the tail region but differ from experiments for the parallel middle body as well as tail region. Pressure gradients show a good agreement with those of potential flow and experiment except the tail region. Friction coefficients show that the numerical results generally are lower than the experimental results estimated from the measured velocity. The difference of friction coefficients between the calculation and the experiment increases with growing of a boundary layer.
참고문헌 (7)
- Ahn, J.W, "Experimental and Numerical Studies of the Flowfield around an Axisymmetric Body", Journal of the Society of Naval Architects of Korea, 34(3), pp.9~18 (1997)
- Coder, D.W, "Reynolds Number Scaling of Velocities in Axisymmetric Turbulent Boundary Layers", 14th Symposium Naval Hydrodynamics, pp.1071~1086 (1983)
- Choi, J.K, "Numerical Analysis of High-Reynolds-number Flat Plate Boundary Layers", of the Annual Autumn Meeting, SNAK, pp.774~779 (2008)
- Ju, S, "Stern Flows at Full-Scale Reynolds Numbers", Journal of Ship Research, 35(2), pp.101~112 (1991)
- Mathematical Formulation of Bodies of Revolution, David Taylor Model Basin Report, "Landweber, L", ~ (1950)
- Lew, J.M, "A Computation of Viscous Flows on an Axisymmetric Body", Journal of the Society of Naval Architects of Korea, 28(1), pp.19~26 (1991)
- Patel, V.C, "Flow at High Reynolds Number and over Rough Surfaces-Achilles Heel of CFD", Journal of Fluids Engineering, 120(3) (1998)