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 language | English (US) |
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Title of host publication | 38th Aerospace Sciences Meeting and Exhibit |
State | Published - 2000 |
Event | 38th Aerospace Sciences Meeting and Exhibit 2000 - Reno, NV, United States Duration: Jan 10 2000 → Jan 13 2000 |
Other
Other | 38th Aerospace Sciences Meeting and Exhibit 2000 |
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Country/Territory | United States |
City | Reno, NV |
Period | 1/10/00 → 1/13/00 |
ASJC Scopus subject areas
- Space and Planetary Science
- Aerospace Engineering