LES and DES investigations of turbulent flow over a sphere

George S. Constantinescu, Kyle Squires

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

Large Eddy Simulation (LES) and Detached Eddy Simulation (DES) are applied to prediction and investigation of the flow around a sphere. DES is a hybrid approach in which the closure is a simple modification to the Spalart-Allmaras model, reducing to Reynolds-Averaged Navier-Stokes (RANS) in attached regions, and LES away from the wall1. Calculations are performed at a Reynolds number, Re = 104, in the sub-critical regime where there is a laminar boundary layer separation from the sphere. A fifth-order upwind-biased treatment of convection is sufficient for capturing the development of the sep arated-shear-layers-and for.the velocity spectra to display an inertial range without excessive decay at the smallest resolved scales. The closest agreement with LES predictions is obtained in DES with the model constant CDES = 0-65. Doth techniques yield predictions of the drag, position of laminar separation, and the mean pressure and skin-friction distributions along the sphere are in good agreement with measurements 2.

Original languageEnglish (US)
Title of host publication38th Aerospace Sciences Meeting and Exhibit
StatePublished - 2000
Event38th Aerospace Sciences Meeting and Exhibit 2000 - Reno, NV, United States
Duration: Jan 10 2000Jan 13 2000

Other

Other38th Aerospace Sciences Meeting and Exhibit 2000
CountryUnited States
CityReno, NV
Period1/10/001/13/00

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

Fingerprint Dive into the research topics of 'LES and DES investigations of turbulent flow over a sphere'. Together they form a unique fingerprint.

  • Cite this

    Constantinescu, G. S., & Squires, K. (2000). LES and DES investigations of turbulent flow over a sphere. In 38th Aerospace Sciences Meeting and Exhibit