Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Uwe Ehrenstein"'
Publikováno v:
Ocean Engineering
Ocean Engineering, 2023, 275, pp.114169. ⟨10.1016/j.oceaneng.2023.114169⟩
Ocean Engineering, 2023, 275, pp.114169. ⟨10.1016/j.oceaneng.2023.114169⟩
International audience; A numerical solution procedure using the mesh-superposition approach, known as the Chimera method, together with the OpenFOAM toolbox environment is used to compute the forces generated by large amplitude heaving and pitching
Autor:
Uwe Ehrenstein
Publikováno v:
Journal of Fluids and Structures
Journal of Fluids and Structures, Elsevier, 2019, 87, pp.39-57. ⟨10.1016/j.jfluidstructs.2019.03.013⟩
Journal of Fluids and Structures, 2019, 87, pp.39-57. ⟨10.1016/j.jfluidstructs.2019.03.013⟩
Journal of Fluids and Structures, Elsevier, 2019, 87, pp.39-57. ⟨10.1016/j.jfluidstructs.2019.03.013⟩
Journal of Fluids and Structures, 2019, 87, pp.39-57. ⟨10.1016/j.jfluidstructs.2019.03.013⟩
The flow around a rigid rectangular pitching plate immersed in a free stream is numerically investigated, addressing the force and drag generated by the oscillatory motion. Several aspect ratios (plate’s span to plate’s length) lower than 0.5 are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::adb779a066b43aa35f3c9532b5cba0b6
https://hal.archives-ouvertes.fr/hal-02090856
https://hal.archives-ouvertes.fr/hal-02090856
Publikováno v:
Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2016, 808, pp.316-336. ⟨10.1017/jfm.2016.645⟩
Journal of Fluid Mechanics, 2016, 808, pp.316-336. ⟨10.1017/jfm.2016.645⟩
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2016, 808, pp.316-336. ⟨10.1017/jfm.2016.645⟩
Journal of Fluid Mechanics, 2016, 808, pp.316-336. ⟨10.1017/jfm.2016.645⟩
International audience; The caudal fin of swimming animals can be modelled as a thrust-producing flapping foil. When considered alone, such a foil produces on average a jet wake with a positive net momentum. It has been argued that the instability ch
Publikováno v:
Applied Ocean Research
Applied Ocean Research, Elsevier, 2020, 101, pp.102278. ⟨10.1016/j.apor.2020.102278⟩
Applied Ocean Research, 2020, 101, pp.102278. ⟨10.1016/j.apor.2020.102278⟩
Applied Ocean Research, Elsevier, 2020, 101, pp.102278. ⟨10.1016/j.apor.2020.102278⟩
Applied Ocean Research, 2020, 101, pp.102278. ⟨10.1016/j.apor.2020.102278⟩
International audience; The thrust performance of a two-dimensional plate pitching harmonically in a uniform flow is assessed numerically using the OpenFOAM toolbox [1]. The mesh displacement vector associated with the rigid body motion is computed a
Autor:
Pierre-Yves Passaggia, Uwe Ehrenstein
Publikováno v:
Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2018, 840, pp.238-265. ⟨10.1017/jfm.2018.6⟩
Journal of Fluid Mechanics, 2018, 840, pp.238-265. ⟨10.1017/jfm.2018.6⟩
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2018, 840, pp.238-265. ⟨10.1017/jfm.2018.6⟩
Journal of Fluid Mechanics, 2018, 840, pp.238-265. ⟨10.1017/jfm.2018.6⟩
The optimal control of a globally unstable two-dimensional separated boundary layer over a bump is considered using augmented Lagrangian optimization procedures. The present strategy allows of controlling the flow from a fully developed nonlinear sta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6004873efd0e82f5036e61447ce95fd0
Publikováno v:
Applied Ocean Research
Applied Ocean Research, Elsevier, 2017, 69, pp.27-37. ⟨10.1016/j.apor.2017.09.003⟩
Applied Ocean Research, 2017, 69, pp.27-37. ⟨10.1016/j.apor.2017.09.003⟩
Applied Ocean Research, Elsevier, 2017, 69, pp.27-37. ⟨10.1016/j.apor.2017.09.003⟩
Applied Ocean Research, 2017, 69, pp.27-37. ⟨10.1016/j.apor.2017.09.003⟩
A flat plate in pitching motion is considered as a fundamental source of locomotion in the general context of marine propulsion. The experimental as well as numerical investigation is carried out at a relatively small Reynold number of 2000 based on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1139e5e56f23233f3db8bc3d09593b2
https://hal.archives-ouvertes.fr/hal-01679663
https://hal.archives-ouvertes.fr/hal-01679663
Publikováno v:
Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2012, 703, pp.363-373
Journal of Fluid Mechanics, 2012, 703, pp.363-373
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2012, 703, pp.363-373
Journal of Fluid Mechanics, 2012, 703, pp.363-373
The unstable dynamics of a transitional laminar separation bubble behind a two-dimensional bump geometry is investigated experimentally using dye visualizations and particle image velocimetry measurements. For Reynolds numbers above a critical value,
Publikováno v:
Journal of Fluid Mechanics
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2011, 681, pp.205-240. ⟨10.1017/jfm.2011.193⟩
Journal of Fluid Mechanics, 2011, 681, pp.205-240. ⟨10.1017/jfm.2011.193⟩
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2011, 681, pp.205-240. ⟨10.1017/jfm.2011.193⟩
Journal of Fluid Mechanics, 2011, 681, pp.205-240. ⟨10.1017/jfm.2011.193⟩
A direct numerical simulation of a turbulent channel flow with a lower curved wall is performed at Reynolds number Reτ ≈ 600. Low-speed streak structures are extracted from the turbulent flow field using methods known as skeletonization in image p
Autor:
Uwe Ehrenstein, François Gallaire
Publikováno v:
Journal of Fluid Mechanics
Journal of Fluid Mechanics, 2008, 614, pp.315-327
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2008, 614, pp.315-327
Journal of Fluid Mechanics, 2008, 614, pp.315-327
Journal of Fluid Mechanics, Cambridge University Press (CUP), 2008, 614, pp.315-327
International audience; A separated boundary layer flow at the rear of a bump is considered. Two-dimensional equilibrium stationary states of the Navier-Stokes equations are determined using a nonlinear continuation procedure varying the bump height
Autor:
François Gallaire, Uwe Ehrenstein
Publikováno v:
Journal of Fluid Mechanics. 536:209-218
Temporal linear stability modes depending on two space directions are computed for a two-dimensional boundary-layer flow along a flat plate. The spatial structure of each individual temporally stable mode is shown to be reminiscent of the spatial exp