The phenomenon of vortex breakdown was simulated numerically by solving the Navier-Stokes equations for three-dimensional, unsteady, and incompressible flows. Results of the simulation were compared with experimental investigations and showed good agreement. Therefore, the data of the simulation were used to inquire the phenomenon in more detail. With the help of a feedback-model, the initiation process and the development of bubble-type breakdown can be illustrated. Within the frame of that model, the formation of a free stagnation point can be described by the redistribution of axial vorticity into the circumferential and radial components. The transition from bubble- to spiral-type breakdown is explained by the growing asymmetry of the flow-field. The importance of the pressure distribution at the lateral boundaries on the initiation and development of bubble-type breakdown was investigated.
Simulation of vortex breakdown
Simulation des Wirbelaufplatzens
Zeitschrift für Flugwissenschaften und Weltraumforschung ; 19 , 6 ; 353-358
1995
6 Seiten, 11 Bilder, 16 Quellen
Article (Journal)
English
Wirbelströmung , Simulationsmodell , Navier-Stokes-Gleichung , dreidimensionale Strömung , instationäre Strömung , inkompressible Strömung , Rückkopplung , Staupunkt , Übergangsbereich , Asymmetrie , Strömungsvorgang , Druckverteilung , Tragflügelumströmung , Rohrströmung , Vergleichsmessung , Wasserkanal , Schlierenphoto , Anstellwinkel (Tragflügel) , Reynolds-Zahl , Randbedingung , Wirbelbildung
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