Lateral Vortex Dynamics behind Ahmed Body

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F10%3A00352476" target="_blank" >RIV/61388998:_____/10:00352476 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Lateral Vortex Dynamics behind Ahmed Body

Popis výsledku v původním jazyce

Structure of the wake behind the Ahmed body is strongly affected by slant angle of the rear window. Besides the classical wake consisting from back-flow turbulent region, the vortex wake system takes the form of two counter-rotary lateral vortices starting at a separation line on the roof with an open separation bulb located at the upper part of the rear window. The dynamical behavior of the longitudinal vortex pair is studied in details experimentally using the Stereo Time-Resolved PIV method. The Bi-Orthogonal Decomposition method (BOD) is utilized to calculate energetic modes, while Principal Interaction Patterns method (PIPs) is used for evaluation modes according to their stability features. Two variants of Ahmed Body with slat angle 25 and 35 degree are investigated respectively. Comparison shows considerable differences in the vortex pair dynamics of the cases in question.

Název v anglickém jazyce

Lateral Vortex Dynamics behind Ahmed Body

Popis výsledku anglicky

Structure of the wake behind the Ahmed body is strongly affected by slant angle of the rear window. Besides the classical wake consisting from back-flow turbulent region, the vortex wake system takes the form of two counter-rotary lateral vortices starting at a separation line on the roof with an open separation bulb located at the upper part of the rear window. The dynamical behavior of the longitudinal vortex pair is studied in details experimentally using the Stereo Time-Resolved PIV method. The Bi-Orthogonal Decomposition method (BOD) is utilized to calculate energetic modes, while Principal Interaction Patterns method (PIPs) is used for evaluation modes according to their stability features. Two variants of Ahmed Body with slat angle 25 and 35 degree are investigated respectively. Comparison shows considerable differences in the vortex pair dynamics of the cases in question.

Druh

O - Ostatní výsledky

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů