Výsledky vyhledávání - "Lutz Lesshafft"

Akademický článek

Linear global stability of a confined plume

Autor: Lutz Lesshafft

Publikováno v: Theoretical and Applied Mechanics Letters, Vol 5, Iss 3, Pp 126-128 (2015)

A linear stability analysis is performed for a plume flow inside a cylinder of aspect ratio 1. The configuration is identical to that used by Lopez and Marques (2013) for their direct numerical simulation study. It is found that the first bifurcation

Externí odkaz: https://doaj.org/article/a172de1480b14bf48c8fea1bb781e766

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Akademický článek

A second-order resolvent formulation for the analysis of turbulent flow structures

Autor: Chevalier, Quentin, Lutz, Lesshafft, Cavalieri, André V. G.

Publikováno v: Comptes Rendus. Mécanique, Vol 351, Iss G2, Pp 355-371 (2023)

An attempt to improve the accuracy of resolvent-based predictions by including velocity correlations in the linear model is developed here. Closure assumptions for unresolved nonlinearities are thus pushed back to a higher order. Turbulent channel fl

Externí odkaz: https://doaj.org/article/589adb0470d04389bad2a607eb0afb3a

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Global linear stability analysis of a flame anchored to a cylinder

Autor: Chuhan Wang, Lutz Lesshafft, Kilian Oberleithner

This study investigates the linear stability of a laminar premixed flame, anchored on a square cylinder and confined inside a channel. Many modern linear analysis concepts have been developed and validated around non-reacting bluff-body wake flows, a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f28576a5e0dff9a05d3c46b0551950ce
http://arxiv.org/abs/2203.02305

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Linear instability of a premixed slot flame: Flame transfer function and resolvent analysis

Autor: Chuhan Wang, Thomas L. Kaiser, Max Meindl, Kilian Oberleithner, Wolfgang Polifke, Lutz Lesshafft

Publikováno v: Combustion and Flame. 240:112016

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c1f9fdb4cf858ec72ab56d0a09bcc776
https://doi.org/10.1016/j.combustflame.2022.112016

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Global stability and nonlinear dynamics of wake flows with a two-fluid interface

Autor: Simon Schmidt, Outi Tammisola, Kilian Oberleithner, Lutz Lesshafft

Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2021, 915, ⟨10.1017/jfm.2021.150⟩

International audience; A framework for the computation of linear global modes, based on time stepping of a linearised Navier–Stokes solver with an Eulerian interface representation, is presented. The method is derived by linearising the nonlinear

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21ab5d7a47e376318ba3116478e456ab
https://hal.archives-ouvertes.fr/hal-03315761/file/Schmidt_JFM_2021.pdf

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The effect of streaks on the instability of jets

Autor: Chuhan Wang, Peter Jordan, Lutz Lesshafft, André V. G. Cavalieri

Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2021, ⟨10.1017/jfm.2020.963⟩
Journal of Fluid Mechanics, Cambridge University Press (CUP), In press

International audience; The presence of elongated streaks of high and low streamwise velocity in the shear layer of circular jets breaks the axisymmetry of their steady-state solution. If the streaks are considered to be part of the base flow, for th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9e42641de6d2f578015155701fdc49e6
https://hal.archives-ouvertes.fr/hal-03028400v2/file/Wang_etal_2021a_final.pdf

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Ambiguity in mean-flow-based linear analysis

Autor: Ugur Karban, Lutz Lesshafft, Eduardo Martini, B. Bugeat, Tim Colonius, Peter Jordan, Aaron Towne, Anurag Agarwal, André V. G. Cavalieri

Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2020, 900, ⟨10.1017/jfm.2020.566⟩

Linearisation of the Navier-Stokes equations about the mean of a turbulent flow forms the foundation of popular models for energy amplification and coherent structures, including resolvent analysis. While the Navier-Stokes equations can be equivalent

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7bbcfd5e2bbdea24a2fda612ea0bedec
https://resolver.caltech.edu/CaltechAUTHORS:20200824-094426276

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Resolvent-based optimal estimation of transitional and turbulent flows

Autor: Lutz Lesshafft, André V. G. Cavalieri, Peter Jordan, Eduardo Martini, Aaron Towne

Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2020, 900, pp.A2. ⟨10.1017/jfm.2020.435⟩

International audience; We extend the resolvent-based estimation approach recently introduced by Towne etal. (J. Fluid Mech., vol. 883, 2020, A17) to obtain optimal, non-causal estimates of time-varying flow quantities from low-rank measurements. We

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e60b39cb9453e008428ebc19467aed64
https://hal.archives-ouvertes.fr/hal-03043736/file/jfm-optimalEstimation-2.pdf

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Optimal triggering of jet bifurcation: an example of optimal forcing applied to a time-periodic base flow

Autor: Lutz Lesshafft, Denis Sipp, Léopold Shaabani-Ardali

Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2020, 885, pp.A34-1-A34-37. ⟨10.1017/jfm.2019.983⟩

International audience; The present article aims at optimising the spread of a bifurcating jet: a jet that combines axisymmetric and helical forcing to achieve increased mixing in a preferential plane. Parekh et al. (Tech. Rep. TF-35, Stanford Univer

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::87796f33ab15d1e6d33929003747f380
https://hal.archives-ouvertes.fr/hal-02910857/document

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The influence of shear on double-diffusive and settling-driven instabilities

Autor: N. Konopliv, Lutz Lesshafft, Eckart Meiburg

Publikováno v: Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2018, 849, pp.902-926. ⟨10.1017/jfm.2018.432⟩

The effects of shear on double-diffusive fingering and on the settling-driven instability are assessed by means of a transient growth analysis. Employing Kelvin waves within a linearized framework allows for the consideration of time-dependent wavefo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8ec4e789e0b5712172c98c2193ec790c
https://doi.org/10.1017/jfm.2018.432

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