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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

NUMERICAL SIMULATION OF A STRAINED TURBULENT AXIAL VORTEX

Gregory A. Blaisdell
School of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana, USA

Jim H. Qin
School of Aeronautics and Astronautics Purdue University West Lafayette, Indiana 47907-1282, USA

Abstract

Direct numerical simulations of a turbulent axial vortex are performed both with and without an externally applied strain field. The global behavior of the turbulence and detailed profiles are examined. Without strain, the turbulence shows transient growth, but ultimately it decays as the flow is stabilized. Simulations with strain are able to capture the instability due to strain only for cases with an axial flow and sufficiently high Reynolds numbers.