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Nonlinear Nonlocal Transition Analysis

Hein, S. (2005) Nonlinear Nonlocal Transition Analysis. Dissertation. DLR-Forschungsbericht. 2005-10, 154 S.

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Abstract

The nonlinear nonlocal transition analysis code NOLOT/PSE is described in detail and its potential is exemplified. The effects of nose bluntness on first- and second-mode boundary—layer instability are discussed for the axisymmetric hypersonic flow of circular blunt cones. Furthermore, the existence of amplified entropy--layer instabilities found in experiment is numerically confirmed for the first time. Various nonlinear transition scenarios in transonic swept wing flows are analysed for the ATTAS and Fokker 100 flight experiments. Dominant nonlinear interaction scenarios are presented and the existence of threshold amplitudes for the onset of rapid nonlinear disturbance growth is pointed out. The late stages of crossflow—dominated transition are analysed further for the DLR swept flat plate experiment using high modal resolution. Thus, the formation of high--frequency secondary disturbances and their subsequent nonlinear development up to the disintegration of the secondary disturbance structures are successfully modelled by nonlinear nonlocal theory (PSE) for the first time.

Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Additional Information: LIDO-Berichtsjahr=2005,
Title:Nonlinear Nonlocal Transition Analysis
Authors:
AuthorsInstitution or Email of Authors
Hein, S.UNSPECIFIED
Date:2005
Number of Pages:154
Status:Published
Keywords:laminar-turbulent transition, parabolized stability equations (PSE), blunt cone, hypersonic flow, entropy-layer instability, ATTAS, Fokker 100, transition scenarios, DLR swept flat plate experiment, high-frequency secondary instability
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Military Technologies
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: elib DLR-Beauftragter
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 19:51

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