| Autor: |
D. S. Henningson, P. H. Alfredsson |
| Rok vydání: |
1996 |
| Předmět: |
|
| Zdroj: |
Turbulence and Transition Modelling ISBN: 9789048147076 |
| DOI: |
10.1007/978-94-015-8666-5_2 |
| Popis: |
There exist a number of methods which are used to predict and model transition. A formulation of the complete stability and transition problem requires not only that the equations of motion are known but also accurate description of the mean flow field, the body geometry as well as the ambient disturbance level both in terms of velocity fluctuations, sound levels, surface vibration and roughness. For the complete formulation not only the overall magnitude of these disturbances are required but also their frequency and wave number spectra. Even if all this information was at hand it would be hard to obtain a solution since the interaction between ambient disturbances and boundary layers is still not fully understood (the so called receptivity problem). Due to these difficulties no single theory which explains transition has been formulated. Instead particular transition scenarios have often been studied in detail using methods suited to the particular problem at hand. In this chapter we will develop the basic mathematical and physical ideas of stability theory and discuss how these theories can explain and be used to model and predict transition in various flow situations for incompressible flows. We will not go into descriptive detail on the particulars of every method of stability analysis or transition scenario, rather we will focus on common themes and try to draw general conclusions. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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