Spatial Variation of Scaling Exponents for Structure Functions in a Decaying Turbulence

摘要：

　　Streamwise evolution of velocity structure functions in a decaying homogeneous and nearly isotropic turbulence is reported for Reynolds number up to Reλ ≈ 720.Both direct method and extended self similarity method were used to measure the scaling exponents.It is found that relative scaling exponents by direct method are in good agreement to those calculated by ESS method.Furthermore,transverse scaling exponents are obviously smaller than the longitudinal ones,which indicate larger intermittency of transverse velocity components than longitudinal ones.Finally,obvious trend is observed for the ratio between longitudinal and transverse structure functions in the inertial sub-range,and the values at last locations are closer to theoretical expectations.

作者: I.AHMAD Z.LU Y.LIU

作者单位: Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai Institute of Applied Mathematic Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai Institute of Applied Mathematic

会议类型: 国际会议

会议名称: Sixth International Conference on Nonlinear Mechanics(第六届国际非线性力学会议)(ICNM-VI)

会议地点: 上海

会议语种:英文

页码: 302-305

在线出版日期: 2013-08-01（万方平台首次上网日期，不代表论文的发表时间）