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pro vyhledávání: '"Willert, Christian"'
We describe the implementation of a 3d Lagrangian particle tracking (LPT) system based on event-based vision (EBV) and demonstrate its application for the near-wall characterization of a turbulent boundary layer (TBL) in air. The viscous sublayer of
Externí odkaz:
http://arxiv.org/abs/2409.01757
Autor:
Willert, Christian E.
The paper addresses the shortcoming of current event-based vision (EBV) sensors in the context of particle imaging. Latency is introduced both on the pixel level as well as during read-out from the array and results in systemic timing errors when pro
Externí odkaz:
http://arxiv.org/abs/2211.05710
Autor:
Willert, Christian, Klinner, Joachim
Contrary to conventional frame-based imaging, event-based vision (EBV) or dynamic vision sensing (DVS) asynchronously records binary signals of intensity changes for given pixels with microsecond resolution. The present work explores the possibilitie
Externí odkaz:
http://arxiv.org/abs/2202.11178
Autor:
Shehzad, Muhammad, Sun, Bihai, Jovic, Daniel, Ostovan, Yasar, Cuvier, Christophe, Foucaut, Jean-Marc, Willert, Christian, Atkinson, Callum, Soria, Julio
High-spatial-resolution (HSR) two-component, two-dimensional particle-image-velocimetry (2C-2D PIV) measurements of a zero-pressure-gradient (ZPG) turbulent boundary layer (TBL) and an adverse-pressure-gradient (APG)-TBL were taken in the LMFL High R
Externí odkaz:
http://arxiv.org/abs/2104.00882
Autor:
Sun, Bihai, Shehzad, Muhammad, Jovic, Daniel, Cuvier, Christophe, Willert, Christian, Ostovan, Yasar, Foucaut, Jean-Marc, Atkinson, Callum, Soria, Julio
Publikováno v:
Exp Fluids 62, 183 (2021)
In the past decade, advances in electronics technology have made larger imaging sensors available to the experimental fluid mechanics community. These advancements have enabled the measurement of 2-component 2-dimensional (2C-2D) velocity fields usin
Externí odkaz:
http://arxiv.org/abs/2103.00115
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Autor:
Willert, Christian E.
This study reports on experimentally observed near-wall reverse flow events in a fully developed flat plate boundary layer at zero pressure gradient with Reynolds numbers between $Re_\tau = 1000$ and $Re_\tau = 2700$. The reverse flow events are capt
Externí odkaz:
http://arxiv.org/abs/1507.00609
The accompanying fluid dynamics videos visualize the temporal evolution of shock structures and sound waves in and around an under-expanded jet that is impinging on a rigid surface at varying pressure ratios. The recordings were obtained at frame rat
Externí odkaz:
http://arxiv.org/abs/1010.3186
Autor:
Willert, Christian, Kompenhans, Jürgen
Around 1930 Ludwig Prandtl and his colleagues O. Tietjens and W. M\"uller published two films with visualizations of flows around surface piercing obstacles to illustrate the unsteady process of flow separation. These visualizations were achieved by
Externí odkaz:
http://arxiv.org/abs/1010.3149
Akademický článek
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