内嵌流体自适应减振方法(IVFUM)中流体运动数值模拟

Numerical Simulation for Fluid-moving in Self-adaptive Vibration Suppression Method with Interior Inlay Viscous Fluid Unit(IVFU)

针对内嵌流体自适应减振方法(IVFUM)和所完成的内嵌流体Euler梁(BIFS)稳态减振试验,进行了对应的流体动力学数值分析。在BIFS定频简谐激励下,根据振动梁模态分析和稳态响应理论,将本意上的流固耦合模型,通过构建流体活动边界,近似简化为半充液腔的纯流体动力学问题。梁在一阶与二阶主振动下FLUENT数值计算所得流腔中的自由液面形状与试验结果基本一致;计算流体自由表面形状、速度场和压力场性态较好地揭示了腔内流体运动的规律和流体-柔性梁力学互动特征,定性和半定量地说明了内嵌式粘性流体单元(IVFU)对柔性梁减振的内在机理和有效性。

Combining the method of self-adaptive reducing vibration with Interior Inlay Fluid Unit(IVFU) proposed by us and the steady reducing vibration experiment of Euler beam interior inlaid with fluid subsystem(BIFS),the corresponding theoretically numerical analysis of hydrokinetics is carried out.Under the specific steady state excitation of BIFS,the original liquid-solid coupling model is simplified to a pure hydrokinetics problem of half-full fluid cavity by constructing the fluid moving-boundary.The shape of fluid free surface in the cavity numerically simulated by FLUENT software basically matches the experimental result.The shape of fluid free surface,the velocity field and the pressure field clearly reveal the movement law of fluid in cavity and the characteristic of fluid-beam interacting,and explain the inherent mechanism and validity of reducing vibration using Interior Inlay Viscous Fluid Unit(IVFU) towards the flexible beam.