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GENERATION OF TURBULENT INLET-BOUNDARY CONDITIONS USING POD-MODES

Peter S. Johansson
Department of Applied Mechanics, Thermodynamics and Fluid Dynamics, NTNU 7491 Trondheim, Norway

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

Resumo

A very large-eddy simulation based on a small set, S, of POD-modes of turbulent channel flow is performed in order to generate turbulent inlet-boundary conditions for a DNS of the same flow. On to the large-scale motion small-scale random POD-modes, not included in the set S, are added in order to impose some energy in the high wave-number part of the spectrum. It is found that the normal Reynolds stresses and the energy spectra attain the same level as in fully developed channel flow approximately 5 channel heights downstream the inlet.