Abonnement à la biblothèque: Guest
Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

LARGE-EDDY SIMULATION OF A COMPRESSIBLE RIBBED CHANNEL FLOW

pages 917-922
DOI: 10.1615/TSFP3.1530
Get accessGet access

RÉSUMÉ

Past experimental and numerical studies have shown that the use of wall-mounted triangular streamwise ribs can lead to drag reduction. This phenomenon was intensively studied during the last twenty years, and DNS of Choi et al. (1993) provided very interesting explanations concerning the role of quasi-longitudinal vortices in the drag-reduction mechanism. This work concerned a flow of constant density above triangular riblets of high height. Large-eddy simulations (LES) have not been used a lot for these studies due to the complex geometry. Here, we employ the immersed boundary techniques proposed by Goldstein et al. (1995). On the upper plane (see Figure 1), an opposite force is imposed to model the riblets. We compare the influence of compressibility upon turbulent intensities of two sawtooth shape riblets. In the last part, we focus on the drag reduction mechanism in the subsonic case.

Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections Prix et politiques d'abonnement Begell House Contactez-nous Language English 中文 Русский Português German French Spain