Lattice boltzmann simulation of the flow around a circular cylinder oscillating streamwisely
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摘要: 用一种新近发展起来的格子Boltzmann方法(LBM)在相对较小的雷诺数(Re \le 200)条件下模拟了不可压缩的流向振荡圆柱绕流问题, 考查了涡脱落模态和升阻力特性. 通过模拟, 在近尾流区发现了实验研究中已经发现的对称/反对称的涡脱落模态, 包括有些传统数值方法未发现的模态. 研究了频率锁定区域的范围及其与振幅的关系, 发现振幅越大, 发生锁定的频率区域越宽. 此外还对升阻力进行了定量意义的模拟,研究了振荡频率和振幅与升阻力的关系.
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关键词:
- 涡脱落模态
Abstract: A newly developed lattice Boltzmann method (LBM) is used tosimulate the incompressible flow past an oscillating circular cylinder. Boththe vortex shedding modes and fluid forces are investigated. The simulationsare conducted at a relatively low Reynolds number (Re \le 200). Numericalresults show the existence of symmetric/asymmetric modes of vortex formationwhich are confirmed by previous experiments in the near wake, including themode which is not found by some traditional numerical methods. Therelationship between oscillation amplitude and lock-on range is studied, andthe results show that the lock-on ranges increase with the increasingoscillation amplitude. The relationship between fluid forces (lift and drag)and oscillation frequency /amplitude is also studied quantitatively.-
Key words:
- vortex shedding modes
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