Výsledky vyhledávání - "Leweke, Thomas"

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Numerical investigation of the vortex roll-up from a helicopter blade-tip using a novel fixed-wing adaptation method

Autor: Joulain, Antoine, Desvigne, Damien, Alfano, David, Leweke, Thomas

Publikováno v: CEAS Aeronautical Journal, Springer, 2017, 8, pp.245-260

This contribution relates to the simulation of the flow around the tip of a helicopter rotor blade in hovering flight conditions. We here propose a new methodology of framework adaptation, using a comprehensive rotor code and high-fidelity numerical

Externí odkaz: http://arxiv.org/abs/1805.00323

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Akademický článek

Generation of a wingtip vortex pair using a pressure-side fin

Autor: Schröder, Dominic, Leweke, Thomas, Hörnschemeyer, Ralf, Stumpf, Eike

Publikováno v: In Aerospace Science and Technology November 2022 130

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Akademický článek

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Volumetric velocity measurements of a helical vortex pair

Autor: Schröder, Dominic, Leweke, Thomas, Hörnschemeyer, Ralf, Stumpf, Eike

Publikováno v: 33rd Congress of the International Council of the Aeronautical Sciences (ICAS 2022)
33rd Congress of the International Council of the Aeronautical Sciences (ICAS 2022), Sep 2022, Stockholm, Sweden. Paper ICAS2022_0083

International audience; This paper presents the results of an experimental study fn a helical vortex pair which is influenced by centrifugal instability. Volumetric velocity measurements using particle tracking methods are performed in a water channe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::8cf1bef218659160bdeca5333fb6e78b
https://hal.science/hal-03871803/file/ICAS2022_0083_paper.pdf

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Numerical investigation of rotor asymmetry to promote wake recovery

Autor: Abraham, Aliza, Ramos-García, Néstor, Sørensen, Jens Nørkær, Leweke, Thomas

Publikováno v: Abraham, A, Ramos-García, N, Sørensen, J N & Leweke, T 2023, Numerical investigation of rotor asymmetry to promote wake recovery . in Wake Conference 2023, 20/06/2023-22/06/2023, Visby, Sweden . vol. 2505, 012032, IOP Publishing, Journal of Physics: Conference Series, no. 1, Wake Conference 2023, Visby, Sweden, 20/06/2023 . https://doi.org/10.1088/1742-6596/2505/1/012032

Tip vortices in the wakes of wind turbines are known to have detrimental effects on downstream turbines such as reduced performance and increased fatigue loading. Rotor asymmetry is investigated as a passive method for mitigating these effects by tri

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______1202::bcda7b02657bf09ecffa93b511c9bfc2
https://orbit.dtu.dk/en/publications/de2632d8-509b-4782-9221-80136eed12b3

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Vortex pairs in the wake of fixed and rotating split-tip wings

Autor: Schröder, Dominic, Leweke, Thomas, Hörnschemeyer, Ralf, Stumpf, Eike

Publikováno v: 1st Direct In-person Colloquium on Vortex Dominated Flows (DisCoVor)
1st Direct In-person Colloquium on Vortex Dominated Flows (DisCoVor), May 2022, Villars-sur-Ollon, Switzerland

International audience

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::57cbf2ddd282417c0bcda068a8754534
https://hal.science/hal-03872907/document

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Tip vortex instability triggered by rotor asymmetry for accelerated wake recovery

Autor: Abraham, Aliza, Leweke, Thomas, Ramos-García, Néstor, Sørensen, Jens

Publikováno v: 2022 NAWEA/WindTech Conference
2022 NAWEA/WindTech Conference, Sep 2022, Newark (DE), United States

International audience; The breakdown of tip vortices in the wake of a wind turbine is the crucial first step of wake mixing and recovery. Capitalizing on inherent instabilities in the vortex system to promote interaction between adjacent vortices ca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3430::92bb1e9614d51f00d9988794674dd6ae
https://hal.science/hal-03872917/file/a_abraham_t4.pdf

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Global pairing instabilities of three interlaced helical vortices in the wake of an asymmetric rotor

Autor: Abraham, Aliza, Castillo-Castellanos, Andrés, Leweke, Thomas

Publikováno v: 14th European Fluid Mechanics Conference (EFMC14)
14th European Fluid Mechanics Conference (EFMC14), Sep 2022, Athènes, Greece

International audience; Helical vortex filaments are susceptible to various types of instabilities, including displacement instabilities, which occur when the vortex core is shifted from its baseline position. The theoretical growth rates of unstable

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3430::746927140dd48dff989d600223c534dd
https://hal.science/hal-03872912/file/EFMC14_abstract_final.pdf

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