【摘要】 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。更多还原

【Abstract】 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.更多还原