Investigation of transition scenarios in boundary-layer flows

by Andreas Stolte
Doctoral thesis
Date of Examination:1999-11-04
Date of issue:1999
Advisor:Prof. Dr. Helmut Eckelmann
Referee:Prof. Dr. Dirk Ronneberger
Persistent Address: http://dx.doi.org/10.53846/goediss-4263

 

 

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Abstract

English

Laminar-turbulent transition mechanisms triggered by crossflow instability in three-dimensional, accelerated boundary-layer flows are investigated using numerical methods of stability anaylsis. The investigations are based on the DLR swept plate experiment, where stationary and traveling crossflow modes can be selectively introduced into the flow field. Nonlinear instability analyses employing the parabolized stability equations (PSE) show that unique saturation amplitudes do neither exist for stationary crossfow vormeans of a spatial bifurcation model. Using Floquet theory, temporal secondary instability analyses are then performed for the mean flow distorted by primary disturbances ...
 
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