Fluid Mechanics and Flight Mechanics

Direct numerical simulation of flow field over streamwise micro riblets

  • LI Chaoqun ,
  • LI Yi ,
  • ZHANG Chenxi ,
  • TANG Shuo
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  • 1. School of Astronautics, Northwestern Polytechnical University, Xi'an 710072, China;
    2. Shaanxi Aerospace Flight Vehicle Design Key Laboratory, Xi'an 710072, China

Received date: 2019-11-04

  Revised date: 2019-11-20

  Online published: 2019-12-19

Supported by

Equipment Pre-research Project; United Project of Equipment Pre-research and Aerospace Science and Technology

Abstract

To simulate the flow over the streamwise micro riblets of symmetric V shape, this paper applies a model of channel flow where the lower wall is mounted with riblets and the upper one is flat. The finite difference method is employed as the numerical method. To accurately obtain the flow of riblets, the 7th WENO (Weighted Essentially Non-Oscillatory) scheme, the fractional-step method combined with the Low-Dissipation and Dispersion Runge-Kutta scheme (LDDRK method) and the 6th central scheme are applied to the discretization of the space, the time advancing and viscous terms. In this paper, the Reynolds number is 5 000 (based on the half width of the channel), the range of the size of the riblets is from 13 to 44 and the inclination of the slope of riblets is 60°. Simulation results illustrate that the maximum of drag reduction is 9% and indicate that in the drag-reducing cases, the riblets can prevent the large-scale streamwise vortices from interacting with the surface directly, weakening the turbulent oscillation and decreasing the number of the streamwise vortices near riblet wall.

Cite this article

LI Chaoqun , LI Yi , ZHANG Chenxi , TANG Shuo . Direct numerical simulation of flow field over streamwise micro riblets[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020 , 41(11) : 123628 -123628 . DOI: 10.7527/S1000-6893.2019.23628

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