Numerical simulation of vortex induced vibration in heat exchanger tube bundle at low Reynolds number

Abstract

It is sound recognized that when the tube is forced to vibrate or is naturally excited to sufficient amplitudes by flow-induced forces, cyclones peeling phenomena arises at downstream of a tube which clues to vibration in the tube. Two-dimensional numerical recreation model for the computation of flow induced vibration of heat exchanger tube bundle imperiled to cross- flow is proficient in current research. Computational Fluid Dynamics (CFD) tool, GAMBIT (grid generation) and ANSYS FLUENT (fluid flow analysis) are operated during numerical investigations. k-epsilon model is used to solve the Navier– Stokes equations. Lift coefficient graph derived from analysis is used to predict the vortex shedding frequency using Fast Fourier Transform (FFT). The results of flow rate, Strouhal number, Reduced velocity, Natural frequency of tube as found from the experimental data has been verified numerically for a Reynolds number range of 4.45 × 104

分享

查看原文 本刊更多论文

低雷诺数下换热器管束涡激振动数值模拟

人们已经认识到，当管道被迫振动或被流体诱导力自然激发到足够的振幅时，旋风分离器剥离现象会在管道下游出现，这表明管道中存在振动。用二维数值重建模型计算有交叉流危险的换热器管束的流激振动是目前研究的热点。在数值研究过程中，使用了计算流体动力学（CFD）工具、GAMBIT（网格生成）和ANSYS FLUENT（流体流动分析）。ε模型用于求解Navier-Stokes方程。通过分析得出的升力系数图用于使用快速傅立叶变换（FFT）预测旋涡脱落频率。在雷诺数为4.45×104＜Re＜4.65×104的情况下，对实验数据中的流量、斯特劳哈尔数、降速和管固有频率的结果进行了数值验证。结果表明，实验结果和数值计算结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。