The Proceedings Fifth International Conference on Numerical Ship Hydrodynamics (1990) / Chapter Skim
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Boundary-Layer Stability and Transition
Boundary-Layer Stability and Transition
Pages 23-34
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S Saric Arizona State University Tempe, USA Abstract Within the last five years, increased emphasis on secondary instability analysis along with the experimental observations of subharmonic instabilities have changed the picture of the transition process for boundary layers in low-disturbance environments.
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1.1 Basic Ideas of Transition With the increased interest in turbulent drag reduction and in large scale structures within the turbulent boundary layer, researchers in turbulence have been required to pay attention to the nature of lam~nar-turbulent transition processes. It is generally accepted that the transition from laminar to turbulent flow occurs because of an incipient instability of the basic flow field.
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As long as laminar flow is maintained and the disturbances remain linear, this method contains all of the necessary physics to accurately predict disturbance behavior. As a transition prediction device, the eN method is certainly the most popular technique used today.
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Since the pioneering work of Nishioka et al.(l975, 1980) , it is accepted that the basic transition phenomena observed in plane channel flow are the same as those observed in boundary layers.
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Additional problems of transition prediction and laminar flow control are discussed by Reshotko (1985, 1986~. The main principle of laminar flow control is to keep the disturbance levels low enough so that secondary instabilities and transition do not occur.
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Compressible laminar boundary layers with suction on swept and tapered wings.
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and Riley, J.J., 1985. Numerical simulations of active stabilization of laminar boundary layers.
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Experiments on secondary instabilities in boundary layers. Invited Paper, U.S.
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/ Off ~ f Figure 1. Staggered peak-valley structure 01-type mode)
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Tbo Cow goes Mom lower tight to upper Ad. ElUpOcal s~c~wisc voices with maximum ~ pc~urbadon of 1 8~ arc included.
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For "high" Reynolds number turbulent boundary layers, the situation is not so clear i.e. it is hard to imagine that the details of the transition process influence the structure of fully developed turbulence.
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