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DIRECT NUMERICAL SIMULATION OF TURBULENT FLOW PAST HEXAGONAL CYLINDERS

Hatef A. Khaledi
Department of Energy and Process Engineering NTNU Trondheim, Norway

Helge I. Andersson
Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, Norway

Аннотация

The unsteady wake behind a hexagonal cylinder in cross-flow is investigated numerically. The time-dependent three-dimensional Navier-Stokes equations are solved for moderately high Reynolds numbers Re and for two different cylinder orientations. The topology of the vortex shedding depends on the orientation and the Strouhal frequency is generally higher in the wake of a face-oriented cylinder than behind a corner-oriented cylinder. This behaviour is contradictory to earlier findings for square cylinder wakes.