基于壁面模化大涡模拟的SUBOFF壁面脉动压力数值研究

Numerical Investigation of Wall Pressure Fluctuations of SUBOFF Based on Wall-Modeled Large-Eddy Simulation

该文基于开源计算流体力学平台OpenFOAM,采用壁面模化大涡模拟中的非平衡壁面模型,对雷诺数Re_(L)=1.2×10^(7)(L为艇长)下的SUBOFF艇体绕流问题开展了数值研究。通过Liutex涡识别方法,该文给出了艇体近壁流动的涡结构分布,提取了艇体表面的时均压力系数,与实验数据进行了对比,并在此基础上重点研究了壁面模化大涡模拟对壁面脉动压力的预测,给出了不同区域的壁面脉动压力频率谱、平行中体处流向和周向波数-频率谱。研究结果表明:壁面模化大涡模拟能够准确预测艇体表面时均压力分布;脉动压力预测方面,艇体首部转捩区的压力脉动更为剧烈,脉动压力谱级整体高于充分发展湍流区;从脉动压力流向波数-频率谱中可观察到湍流能量集中的迁移脊,很好地反映了湍流的时空关联特性。

In this paper,the numerical investigation of the flow around the SUBOFF at a Reynolds number of Re_(L)=1.2×10^(7) is conducted using the non-equilibrium wall model in wall-modeled large-eddy simulation via OpenFOAM.The Liutex vortex identification method is employed to analyze the vortex structure distribution near the hull surface.The time-averaged pressure coefficients on the hull surface are compared with experimental data.Subsequently,the prediction of wall pressure fluctuation is focused research by the wall model.And the wall pressure fluctuation frequency spectra on different areas of the hull and the wavenumber frequency spectra in different directions are provided.The results show that the wall-modeled large-eddy simulation can accurately predict the time-averaged pressure distribution on the hull surface.In terms of the wall pressure fluctuation spectra,the bow region of the hull exhibits higher fluctuating pressure levels compared to the fully developed turbulent region,indicating more intense pressure fluctuations.Additionally,the streamwise wavenumber frequency spectra of wall pressure fluctuation showcases the convective ridges of turbulent energy,effectively reflecting the spatial and temporal correlations of turbulence.