A numerical simulation of fluid structure interaction effects on vortex dynamics and heat transfer was performed in a rectangular channel with two plates mounted symmetrically across from one another on two channel walls. The two plates can both be rigid (configuration 1), plate 1 can be flexible while plate 2 is rigid (configuration 2), or both can be flexible (configuration 3). The vorticity and temperature contours, Nusselt number, friction factor, and overall performance coefficient for the three configurations are compared at three Reynolds numbers (630, 840, and 1050). The flow in configuration 1 is susceptible to pitchfork bifurcation: steady asymmetric vortices in the channel can be easily seen due to numerical round-off errors or initial conditions even when the geometry and mesh are totally symmetric. When only plate 1 is flexible in configuration 2, this can induce vortex shedding at higher Reynolds numbers and improved heat transfer. When both plates are flexible in configuration 3, the flow experiences Hopf bifurcation, which significantly improves the time-averaged Nusselt number and overall performance coefficient due to the consistent and periodic vortex shedding in the channel caused by the out-of-phase self-vibration of the two plates. This article provides an innovative approach to take full advantage of the fluid structure interaction process to improve the heat transfer of a channel.

中文翻译：

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通过流体结构相互作用的相外自振动增强传热

在一个矩形通道中进行了流体结构相互作用对涡旋动力学和传热影响的数值模拟，该矩形通道中两个板彼此对称地安装在两个通道壁上。两个板都可以是刚性的（配置1），板1可以是柔性的，而板2则是刚性的（配置2），或者两个板都可以是柔性的（配置3）。在三个雷诺数（630、840和1050）下，比较了三种配置的涡度和温度等高线，努塞尔数，摩擦系数和整体性能系数。构造1中的流动易受干草叉分叉的影响：由于数值舍入误差或初始条件，即使几何形状和网格是完全对称的，也很容易看到通道中的稳定非对称涡流。当仅板1在构造2中是柔性的时，这可以在较高的雷诺数下引起涡旋脱落并改善传热。当两个板在配置3中均处于柔性状态时，流会经历Hopf分叉，由于异相自振动在通道中产生一致且周期性的涡旋脱落，从而大大提高了时均Nusselt数和总体性能系数两个盘子中的一个 本文提供了一种创新的方法，可以充分利用流体结构的相互作用过程来改善通道的热传递。由于两块板的异相自振动引起的通道中一致且周期性的涡旋脱落，从而显着提高了时均Nusselt数和总体性能系数。本文提供了一种创新的方法，可以充分利用流体结构的相互作用过程来改善通道的热传递。由于两块板的异相自振动引起的通道中一致且周期性的涡旋脱落，从而显着提高了时均Nusselt数和总体性能系数。本文提供了一种创新的方法，可以充分利用流体结构的相互作用过程来改善通道的热传递。