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Direct Numerical Simulations of Boundary Layer Transition on a Flat PlateIn recent years the techniques of computational fluid dynamics (CFD) have been used to compute flows associated with geometrically complex configurations. However, success in terms of accuracy and reliability has been limited to cases where the effects of turbulence and transition could be modeled in a straightforward manner. Even in simple flows, the accurate computation of skin friction and heat transfer using existing turbulence models has proved to be a difficult task, one that has required extensive fine-tuning of the turbulence models used. In more complex flows (for example, in turbomachinery flows in which vortices and wakes impinge on airfoil surfaces causing periodic transitions from laminar to turbulent flow) the development of a model that accounts for all scales of turbulence and predicts the onset of transition is an extremely difficult task. Fortunately, current trends in computing suggest that it may be possible to perform direct simulations of turbulence and transition at moderate Reynolds numbers in some complex cases in the near future. This presentation will focus on direct simulations of transition and turbulence using high-order accurate finite-difference methods. The advantage of the finite-difference approach over spectral methods is that complex geometries can be treated in a straightforward manner. Additionally, finite-difference techniques are the prevailing methods in existing application codes. An application of accurate finite-difference methods to direct simulations of transition and turbulence in a spatially evolving boundary layer subjected to high levels of freestream turbulence will be presented.
Document ID
20070003475
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Rai, Man Mohan
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 1997
Subject Category
Fluid Mechanics And Thermodynamics
Meeting Information
Meeting: Workshop on Boundary Layer Transition
Location: Syracuse, NY
Country: United States
Start Date: September 7, 1997
End Date: September 10, 1997
Funding Number(s)
PROJECT: RTOP 505-60-00
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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