Analytical modelling of Karman vortex street

• Autorzy: Pankanin G. L. , Berliński J. , Chmielewski R.

Warianty tytułu

PL

Analityczne modelowanie ścieżki wirowej

• Języki publikacji: EN

Abstrakty

EN

A new approach to the Karman vortex street modelling is presented. The model is based on observations of the Karman vortex street. The idea of the model is based on fundamental mechanical formulas. According to the model, vortices are created on the bluff body surface in the area of the boundary separation. The grow-up of the vortex results from the process looking like a reeling of some amount of the liquid on the vortex core during its rolling downstream on the surface of unmoved stagnation region. This process is represented in the model as a succeeding addition layer attachment. The vortex evolution has been divided into three stages. Hence three zones downstream the bluff body are distinguished: intensive development, stabilization and vortices decay. Influence of the fluid viscosity on the development process and rotation energy of the vortex has been also analyzed.

PL

W artykule przedstawiono nowe podejście do problemu modelowania ścieżki wirowej Karmana. Wykorzystuje ono wnioski z obserwacji zjawiska i stanowi próbę opisania go prostymi zależnościami właściwymi dla fizyki klasycznej. Wiry powstają na powierzchni przeszkody w obszarze oderwania od strugi. Proces wzrostu wiru polega na nawijaniu na jego rdzeń cienkiej warstwy płynu w miarę oddalania się od punktu oderwania. W modelu proces ten jest reprezentowany przez "obrastanie" wiru kolejnymi warstwami. Proces rozwoju został podzielony na trzy etapy. Zostały wyróżnione trzy strefy rozwoju wiru: intensywnego rozwoju, stabilizacji i zaniku. Przeanalizowano wpływ lepkości płynu na proces rozwoju i energię wiru.

Słowa kluczowe

EN

numerical modelling; Karman vortex street; vortex meter

PL

modelowanie cyfrowe; ścieżka wirowa Karmana; wiromierz

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2005
• Tom: Vol. 12, nr 4
• Strony: 413--425
• Opis fizyczny: Bibliogr. 31 poz., fot., rys.

Twórcy

autor

Pankanin G. L.

• Warsaw University of Technology, Institute of Electronics Systems, Poland

autor

Berliński J.

• Warsaw University of Technology, Institute of Electronics Systems, Poland

autor

Chmielewski R.

• Warsaw University of Technology, Institute of Electronics Systems, Poland

Bibliografia

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