线性分层流中圆柱绕流数值模拟方法研究

发布时间：2018-03-17 15:31

  本文选题：分层流　切入点：尾迹　出处：《哈尔滨工程大学学报》2016年09期 　论文类型：期刊论文

【摘要】：为达到研究连续分层流中航行潜体尾迹探测之目的,探讨了线性分层流中基于多相流混合模型的圆柱绕流数值模拟方法。首次采用LES方法数值模拟了高傅汝德数下分层流动,成功模拟出试验条件下对应傅汝德数下的尾迹特征;用RANS方法实现了对低傅汝德数低雷诺数下分层流动流场的定量描述;通过对高雷诺数不同湍流模型下的流动展开讨论,发现采用不受各向同性假设限制的RSM模型进行分层湍流数值模拟是合理的,且对近壁面的处理要采用壁面函数的方法。基于多相流混合模型建立了傅汝德数从低到高,粘性模型从层流至湍流各个取值段模拟分层流动的数值方法。
[Abstract]:In order to study the detection of submersible wake in continuous stratified flow, a numerical simulation method based on the mixed model of multiphase flow in linear stratified flow is discussed. The LES method is used to simulate stratified flow at high Fourier number for the first time. The wake characteristics corresponding to Fourier number under experimental conditions are successfully simulated, the quantitative description of stratified flow field under low Reynolds number and low Fourier number is realized by RANS method, and the flow under different turbulence models with high Reynolds number is discussed. It is found that it is reasonable to use the RSM model, which is not restricted by isotropic hypothesis, to simulate stratified turbulence, and the method of wall function is used to deal with the near wall. Based on the mixed model of multiphase flow, the Fourier number is established from low to high. A numerical method for simulating stratified flow from laminar flow to turbulent flow.
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