This article is cited in 9 papers

Gases and Fluids

Calculation of the flow about a sphere and the drag of the sphere under laminar and strongly turbulent conditions

N. N. Simakov

Yaroslavl State Technical University

Abstract: To investigate the influence of a strongly turbulent incoming flow on the hydrodynamic drag of a body and occurrence of the early crisis of drag, a numerical experiment is conducted in which a free gas flow about a sphere is simulated for two cases, namely, for a laminar flow and for a strongly turbulent flow. Turbulence is simulated by assuming a high kinematic coefficient of turbulent viscosity. Calculation data lead us to conclude that the early crisis of drag at Reynolds numbers near 100, which shows up as a considerable (four-to sevenfold) decrease in the hydrodynamic force and the drag coefficient of the body, can be explained by the strong turbulence of the incoming flow.

Received: 08.04.2012
Accepted: 09.08.2012

 English version: Technical Physics, 2013, 58:4, 481–485

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