论文标题
压力模式分解分析流经过的跨流动圆柱体
Pressure Mode Decomposition Analysis of the Flow past a Cross-flow Oscillating Circular Cylinder
论文作者
论文摘要
适当的正交分解（POD）通常用于在流体流中开发降级模型（ROM）进行设计，控制和优化。与速度场是焦点的通常实践相反，我们将POD分析应用于从过去的静止和振荡缸的数值模拟中获得的压力场数据。由于压力主要有助于作用在结构上的流体动力，因此我们计算了在锁定和锁定区域中振荡的气缸表面上的压力吊舱模式。然后将这些模式分为正弦和余弦，以估计它们在压力提升和阻力分解系数的发展中的贡献。这项研究的关键发现是，与同步案例相比，需要更多的POD模式来捕获非同步状态的流动物理。这项研究的工程应用是开发有效控制技术的降级模型。
Proper orthogonal decomposition (POD) is often employed in developing reduced-order models (ROM) in fluid flows for design, control, and optimization. Contrary to the usual practice where velocity field is the focus, we apply the POD analysis on the pressure field data obtained from numerical simulations of the flow past stationary and oscillating cylinders. Since pressure mainly contributes to the hydrodynamic forces acting on the structure, we compute the pressure POD modes on the cylinder surface oscillating in lock-in and lock-out regions. These modes are then dissected into sine and cosine magnitudes to estimate their contribution in the development of pressure lift and drag decomposition coefficients, respectively. The key finding of this study is that more POD modes are required to capture the flow physics in nonsynchronous regimes as compared to synchronization case. Engineering application of this study is the development of reduced-order models for effective control techniques.
