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近壁湍流相干结构传播速度的研究
Study on Propagation Velocity of Coherent Structure in Wall Region of a Turbulent Flow
【摘要】 近壁湍流相干结构传播速度的问题,目前尚无理论结果。本文利用流动稳定性理论中的共振三波概念建立单个相干结构模型,采用紧致有限差分和Fourier谱展开相结合的方法对近壁湍流相干结构进行了数值模拟,计算得到的相干结构流向传播速度与直接数值模拟的结果一致。
【Abstract】 Up till now there is no clear cut definition of theory for propagation velocity of coherent structure in wall region of a turbulent flow. A model of a single coherent structure is proposed, using the idea of resonant triad of theory of hydrodynamic stability. This paper investigates the coherent structure in the wall region of a turbulent flow by numerical simulation combining compact finite differences and Fourier spectral expansion. The calculated streamwise propagation velocity of the coherent structure agrees reasonally well with those of direct numerical simulation.
【关键词】 流动稳定性理论;
有限差分法;
湍流;
相干结构;
传播速度;
【Key words】 hydrodynamic stability theory; finite difference methods; turbulence; coherent structure; propagation velocity;
【Key words】 hydrodynamic stability theory; finite difference methods; turbulence; coherent structure; propagation velocity;
- 【文献出处】 南京航空航天大学学报 ,JOURNAL OF NANJING UNIVERSITY OF AERONAUTICS & ASTRONAUTICS , 编辑部邮箱 ,1999年03期
- 【分类号】O357
- 【被引频次】1
- 【下载频次】81