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Numerical evaluation method of turbulence drag reduction with riblets
Received date: 2016-03-25
Revised date: 2016-09-26
Online published: 2016-09-28
In order to apply numerical simulation method based on Reynolds-averaged Navier-Stokes (RANS) equations to drag reduction with riblets, inspired by the roughness model-Wilcox and after a deeper study on the effect of the value of ω near wall in k-ω shear stress transport (SST) turbulence model, it turns out that an increasing of wall ω in viscous sublayer leads to a decreasing of turbulent kinetic energy, turbulent viscosity and Reynolds shear stress, which shows the same change as realistic riblets. Based on the classical experimental data of riblets with symmetric V grooves (height=width), by introducing the effect factors pressure gradients and yaw angle, a modeling function between riblets geometry size and the value of wall ω is established in complex flow conditions. Comparing with the experimental data confirms that the modeling riblets can predict the drag reduction as realistic riblets. Besides, a detailed application method of modeling riblets is proposed. At last, an overall design and evaluation of the drag reduction by riblets is given in the case of the C919 wing-body combination.
ZHOU Jian , OU Ping , LIU Peiqing , GUO Hao . Numerical evaluation method of turbulence drag reduction with riblets[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(4) : 120263 -120263 . DOI: 10.7527/S1000-6893.2016.0263
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