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Suche nach „[M.] [Kloker]“ hat 6 Publikationen gefunden
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    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    M. Kloker, Giuseppe Bonfigli, S. Wagner

    3-D-boundary-layer transition induced by superposed steady and travelling crossflow vortices

    High performance computing in science and engineering '02, [S.l.]

    2014

    ISBN: 978-3-642-63947-0

    Maschinenbau und Mechatronik

    Zeitschriftenartikel

    M. Kloker, Giuseppe Bonfigli

    Secondary instability of crossflow vortices: validation of the stability theory by direct numerical simulation

    Journal of Fluid Mechanics, vol. 583, pp. 229-272

    2007

    Abstract anzeigen

    Detailed comparison of spatial direct numerical simulations (DNS) and secondary linear stability theory (SLST) is provided for the three-dimensional crossflow-dominated boundary layer also considered at the DLR-Göttingen for experiments and theory. Secondary instabilities of large-amplitude steady and unsteady crossflow vortices arising from one single primary mode have been analysed. SLST results have been found to be reliable with respect to the dispersion relation and the amplitude distribution of the modal eigenfunction in the crosscut plane. However, significant deviations have been found in the amplification rates, the SLST results being strongly dependent on the necessarily simplified representation of the primary state. The secondary instability mechanisms are shown to be local, i.e. robust with respect to violations of the periodicity assumption made in the SLST for the wall-parallel directions. Perturbations associated with different local maxima of the spanwise periodic eigenfunctions develop independently from each other interacting only with the primary vortices next to them. Characteristic structures induced by different secondary instability modes have been analysed and an analogy with the Kelvin–Helmholtz instability mechanism has been highlighted.

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    M. Kloker, Giuseppe Bonfigli

    Secondary instability of superposed steady and unsteady crossflow vortices

    New results in numerical and experimental fluid mechanics IV, Berlin; New York, vol. 87

    2004

    ISBN: 978-3-540-20258-5

    Maschinenbau und Mechatronik

    Vortrag

    M. Kloker, Giuseppe Bonfigli

    Comparison of DNS and stability theory with respect to the secondary instability of crossflow vortices

    Euromech Fluid Mechanic Conference (EFMC) 2003, Toulouse, Frankreich

    2003

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    M. Kloker, Giuseppe Bonfigli

    Spatial Navier-Stokes simulation of crossflow-induced transition in a three-dimensional boundary layer

    New results in numerical and experimental fluid mechanics, Berlin; Heidelberg; New York, vol. 11

    2001

    ISBN: 978-3-540-41552-7

    Maschinenbau und Mechatronik

    Beitrag (Sammelband oder Tagungsband)

    M. Kloker, Giuseppe Bonfigli

    Three-dimensional Boundary-Layer Transition Phenomena Investigated by Spatial Direct Numerical Simulation

    Laminar-Turbulent Transition, Berlin, Heidelberg

    2000

    ISBN: 978-3-642-08752-3