Abo Bibliothek: Guest
Ninth International Symposium on Turbulence and Shear Flow Phenomena
June 30 - July 3, 2015, University of Melbourne, Australia

DOI: 10.1615/TSFP9

DRAG REDUCTION EFFECT DUE TO FINITE PERMEABLE WALL IN TURBULENT CHANNEL FLOW

pages 21-24
DOI: 10.1615/TSFP9.40
Get accessGet access

ABSTRAKT

A three-dimensional numerical simulation for turbulent channel flow with permeable wall was carried out to investigate the dependency of permeable wall thickness on drag reduction. The permeability in the porous media attached on the outer solid wall was modelled with the Darcy-Forchheimer model, and the thickness of permeable wall was parametrically changed up to the ratio of 20% to the bulk fluid height. The governing equations for incompressible fluid in the both bulk fluid and permeable regions were discretized by the finite volume method and solved by the PISO algorithm.
When the thickness of permeable wall was comparable with that of the turbulent boundary layer, drag was reduced and its reduction ratio reached up to about 10%. When the sweep and ejection near wall was properly controlled due to the wall permeability, the vortex structure was stabilized and its formation process was not frequently repeated, therefore, turbulent drag reduction was achieved.

Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen Preise und Aborichtlinien Begell House Kontakt Language English 中文 Русский Português German French Spain