基于LES的直管流致振动分析

基于CFX 的LES 模拟了直管内完全发展的湍流, 通过log-wake 法则验证了大涡计算的准确性。利用CCL+APDL+MATLAB 语言编制了流固耦合插值算法, 该算法可对流体载荷进行扩展, 具有插值精度高、计算效率高等特点, 而且能同时考虑流体脉动压强和剪切力作用下结构的振动响应。计算表明:对于光滑直管流致振动问题, 振源主要来自流体的脉动压强, 而流体剪切力可基本忽略。最后, 总结了管内流速与流体脉动压强、结构响应的关系, 脉动压强和振动加速度与速度近似成抛物线规律, 可为非嵌入式的流量传感器的研究提供参考和依据。

FLOW-INDUCED VIBRATION ANALYSIS OF STRAIGHT PIPE BASED ON LES

Fully developed turbulence in a straight pipe is simulated with LES (Large Eddy Simulation) of CFX and the result is fit closely by the log-wake law. The FSI (Fluid-Structure Interaction) interpolation algorithm, which can extend the fluid load, is compiled using the language of CCL & APDL & MATLAB, with the advantage of high accuracy and efficiency. The algorithm can also take into account the structural vibration caused by fluctuating pressure and shear force. It shows that the flow-induced vibration of a straight pipe is induced by fluctuating pressure rather than shear force. Meanwhile, it is summarized that the velocity has a parabola relationship with fluctuating pressure and structural vibration, which can provide reference for the research of Non-embedded flow sensors.