Acceleration feature points of unsteady shear flows

• Autorzy: Kasten J. , Reinighaus J. , Hotz I. , Hege H.-C. , Noack B. , Daviller G. , Morzyński M.
• Języki publikacji: EN

Abstrakty

EN

A framework for extracting features in 2D transient flows, based on the acceleration field to ensure Galilean invariance is proposed in this paper. The minima of the acceleration magnitude (a superset of acceleration zeros) are extracted and discriminated into vortices and saddle points, based on the spectral properties of the velocity Jacobian. The extraction of topological features is performed with purely combinatorial algorithms from discrete computational topology. The feature points are prioritized with persistence, as a physically meaningful importance measure. These feature points are tracked in time with a robust algorithm for tracking features. Thus, a space-time hierarchy of the minima is built and vortex merging events are detected. We apply the acceleration feature extraction strategy to three two-dimensional shear flows: (1) an incompressible periodic cylinder wake, (2) an incompressible planar mixing layer and (3) a weakly compressible planar jet. The vortex-like acceleration feature points are shown to be well aligned with acceleration zeros, maxima of the vorticity magnitude, minima of the pressure field and minima of λ2.

Słowa kluczowe

EN

visualization; feature extraction; flow topology

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Archives of Mechanics
• Rocznik: 2016
• Tom: Vol. 68, nr 1
• Strony: 55--80
• Opis fizyczny: Bibliogr. 37 poz., rys. kolor.

Twórcy

autor

Kasten J.

• IVU Traffic Technologies AG, Berlin, Germany

autor

Reinighaus J.

• IST Austria, Klosterneuburg, Austria

autor

Hotz I.

• Linköping University, Norrköping, Sweden

autor

Hege H.-C.

• Zuse Institute Berlin (ZIB), Berlin, Germany

autor

Noack B.

• LIMSI-CNRS, Orsay, France
• Institut für Strömungsmechanik Technische Universität Braunschweig, Germany

autor

Daviller G.

• IMFT, CNRS, Toulouse, France

autor

Morzyński M.

• Poznań University of Technology, Poznań, Poland

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.