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| Numerical investigation of flow past two elliptical cylinders in side-by-side arrangement via lattice Boltzmann-fictitious domain method |
| Received:March 12, 2013 Revised:April 29, 2013 |
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| DOI：10.7511/jslx201404017 |
| KeyWord:elliptical cylinder iattice Boltzmann method fictitious domain method flow past cylinder |
| Author | Institution |
| 聂德明 |
中国计量学院 计量测试工程学院, 杭州 |
| 郑梦娇 |
中国计量学院 计量测试工程学院, 杭州 |
| 高原 |
中国计量学院 计量测试工程学院, 杭州 |
| 林建忠 |
中国计量学院 计量测试工程学院, 杭州 |
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| Abstract: |
| In this work a lattice Boltzmann-fictitious domain method has been adopted to numerically investigate flow past two elliptical cylinders in side-by-side arrangement.Firstly, the present method is validated by comparing its results with previous numerical results for flow past two circular cylinders at Reynolds number Re=200.Secondly, flow past two elliptical cylinders at Re=200 has been simulated with the spacing between two cylinder surfaces g=0.5a and 2.0a(a is the major axes of elliptical cylinder).The effects of the ratio of major axes to minor axes α on the lift coefficients and drag coefficients of the cylinders and vortex structures have been explored.It has been found that in comparison with the results of the circular cylinders, the lift and drag coefficients of the elliptical cylinders may have two variations for g=0.5a.One is that the lift and drag coefficients are more regular and nearly periodic as time evolves.The other variation is that the flow between the two cylinders may deflect to one of cylinders for a long time.These two variations depend on the value of α.Furthermore, for g=2.0a there exist four rows of vortex street behind the two elliptical cylinders, which will evolve into two rows of vortex street spreading to both sides after some time. |