Lagrangian Structure Function's Scaling Exponents in Turbulent Channel Flow
LUO Jian-Ping 1,3, LU Zhi-Ming2, USHIJIMA Tatsuo3, KITOH Osami3, LIU Yu-Lu1,2
1Shanghai Institute of Technology, Shanghai 2002352Shanghai Institute of Applied Mathematics and Mechanics, ShanghaiUniversity, Shanghai 2000723Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
Lagrangian Structure Function's Scaling Exponents in Turbulent Channel Flow
LUO Jian-Ping 1,3, LU Zhi-Ming2, USHIJIMA Tatsuo3, KITOH Osami3, LIU Yu-Lu1,2
1Shanghai Institute of Technology, Shanghai 2002352Shanghai Institute of Applied Mathematics and Mechanics, ShanghaiUniversity, Shanghai 2000723Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
摘要The Lagrangian structure function's scaling exponents and intermittency of three-dimensional incompressible turbulent channel flow are investigated by using direct numerical simulation. The intermittency in streamwise velocity increments is found to increase in the near-wall region, which can be attributed to the presence of strong mean shear and organized motions in the near-wall region. It is found that the intermittency of transverse velocity increments is weaker than that of longitudinal ones. The present ESS evaluation of ζL(q) for the structure function of the streamwise velocity component in the channel centre is fairly close to experimental estimates of isotropic turbulence.
Abstract：The Lagrangian structure function's scaling exponents and intermittency of three-dimensional incompressible turbulent channel flow are investigated by using direct numerical simulation. The intermittency in streamwise velocity increments is found to increase in the near-wall region, which can be attributed to the presence of strong mean shear and organized motions in the near-wall region. It is found that the intermittency of transverse velocity increments is weaker than that of longitudinal ones. The present ESS evaluation of ζL(q) for the structure function of the streamwise velocity component in the channel centre is fairly close to experimental estimates of isotropic turbulence.
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2010, Vol. 27 
