[논문]Application of Immersed Boundary Method for Flow Over Stationary and Oscillating Cylinders

Lee Dae-Sung; Ha Man-Yeong; Kim Sung-Jin; Yoon Hyun-Sik

doi:10.1007/bf02915948

Application of Immersed Boundary Method for Flow Over Stationary and Oscillating Cylinders 원문보기

Journal of mechanical science and technology, v.20 no.6, 2006년, pp.849 - 863

Lee Dae-Sung (Department of mechanical engineering, Pusan National University) , Ha Man-Yeong (Department of mechanical engineering, Pusan National University) , Kim Sung-Jin (Department of mechanical engineering, Pusan National University) , Yoon Hyun-Sik (ASERC, Pusan National University)

Abstract ▼ AI-Helper

IBM (Immersed Boundary Method) with feedback momentum forcing was applied to stationary and moving bodies. The capability of IBM to treat the obstacle surfaces, especially with moving effect has been tested for two dimensional problems. Stationary and oscillating cylinders were simulated by using IBM based on finite volume method with Cartesian coordinates. For oscillating cylinder, lateral and vertical motions are considered, respectively. Present results such as time histories of drag and lift coefficients for both stationary and oscillating cases are in good agreement with previous numerical and experimental results. Also, the instantaneous wake patterns of oscillating cylinder with different oscillating frequency ratios well represented those of previous researches. More feasibility study for IBM has been carried out to two oscillating cylinders. Drag and lift coefficients are presented for two cylinders oscillating sinusoidally with phase difference of $180^{\circ}$.

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by immersed boundary methods. In this study, for the stationary flow, drag and lift forces are evaluated by integrating applied momentum forcing. Drag and lift coefficients and Strouhal number were compared in Table 2.

가설 설정

At position 0° in Fig. 7 (a), pressure at left side of cylinder is high and pressure at top and bottom of the cylinder is low. As cylinder decelerates, left side pressure increases.

이론/모형

In this study, bilinear interpolation is used to know surface velocities with its position infor- mation. The discrete surface points in Fig.
In this study, inline oscillation has been simulated by using feedback IBM and results were compared with those of Diitsch et al. (1998)'s experimental study and Guilmineau & Queutey (2002)'s numerical study.
The scheme was used previously by Kim and Moin(1985)and Zang et al, (1994). In this time stepping scheme, the velocity is advanced from time level _'死'to an intermediate level '*' by solving the advection-diffusion equation without pressure term in which the nonlinear terms are treated explicitly using second-order Adams- Bashforth scheme. The diffusion terms are treated implici_니y using Crank-Nicolson scheme.

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Application of Immersed Boundary Method for Flow Over Stationary and Oscillating Cylinders 원문보기

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Application of Immersed Boundary Method for Flow Over Stationary and Oscillating Cylinders 원문보기

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