Detached-Eddy Simulation of flow over a sphere

George S. Constantinescu, Rafael Pacheco, Kyle Squires

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

12 Scopus citations

Abstract

Detached-Eddy Simulation (DES) is applied to prediction and investigation of the flow around a sphere. DES is a hybrid approach which has RANS behavior near the wall and becomes a Large Eddy Simulation in the regions away from solid surfaces. Results are presented for a range of Reynolds numbers, from 104 to 1.1 × 106. Laminar or turbulent boundary layer separation is specified via the initial and boundary conditions of the simulations. The turbulent separation cases are effectively tripped in the sense that the turbulence model is active over the entire surface of the sphere. DES predictions are evaluated using experimental measurements and with respect to grid refinement in the azimuthal direction. Also investigated is the influence of modifications to the baseline turbulence model to account for streamline curvature and one case in which the model is activated at a position corresponding approximately to the location of boundary layer transition on the sphere at Re = 1.1 × 106. For both the sub- and super-critical solutions the agreement is reasonable for the drag, pressure, and skin friction coefficients. Shedding frequencies for the sub-critical flows agree well with measurements. The wake structure in the super-critical solutions is substantially changed compared to the sub-critical flows with the wake in the super-critical regime dominated by a pair of streamwise vortices.

Original languageEnglish (US)
Title of host publication40th AIAA Aerospace Sciences Meeting and Exhibit
StatePublished - 2002
Event40th AIAA Aerospace Sciences Meeting and Exhibit 2002 - Reno, NV, United States
Duration: Jan 14 2002Jan 17 2002

Other

Other40th AIAA Aerospace Sciences Meeting and Exhibit 2002
CountryUnited States
CityReno, NV
Period1/14/021/17/02

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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