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DC Field | Value | Language |
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dc.contributor.author | Neamtu, M. | - |
dc.contributor.author | Krug, D. | - |
dc.contributor.author | Mollicone, Jean-Paul | - |
dc.contributor.author | Reeuwijk, M. van | - |
dc.contributor.author | Haller, G. | - |
dc.contributor.author | Holzner, M. | - |
dc.date.accessioned | 2022-08-04T09:27:31Z | - |
dc.date.available | 2022-08-04T09:27:31Z | - |
dc.date.issued | 2020 | - |
dc.identifier.citation | Neamtu, M., Krug, D., Mollicone, J. P., van Reeuwijk, M., Haller, G., & Holzner, M. (2020). Connecting the time evolution of the turbulence interface to coherent structures. In M. M. Neamtu-Halic (Ed.), Objective coherent structures near the turbulent/non-turbulent interface in a stably stratified turbulent flow (pp. 41-69). Zurich: ETH Zurich | en_GB |
dc.identifier.uri | https://www.um.edu.mt/library/oar/handle/123456789/100308 | - |
dc.description.abstract | The surface area of turbulent/non-turbulent interfaces (TNTIs) is continuously produced and destroyed via stretching and curvature/propagation effects. Here, the mechanisms responsible for TNTI area growth and destruction are investigated in a turbulent flow with and without stable stratification through the time evolution equation of the TNTI area. We show that both terms have broad distributions and may locally contribute to either production or destruction. On average, however, the area growth is driven by stretching, which is approximately balanced by destruction by the curvature/propagation term. To investigate the contribution of different length scales to these processes, we apply spatial filtering to the data. In doing so, we find that the averages of the stretching and the curvature/propagation terms balance out across spatial scales of TNTI wrinkles and this scale-by-scale balance is consistent with an observed scale invariance of the nearby coherent vortices. Through a conditional analysis, we demonstrate that the TNTI area production (destruction) localizes at the front (lee) edge of the vortical structures in the interface proximity. Finally, we show that while basic mechanisms remain the same, increasing stratification reduces the rates at which TNTI surface area is produced as well as destroyed. We provide evidence that this reduction is largely connected to a change in the multiscale geometry of the interface, which tends to flatten in the wall-normal direction at all active length scales of the TNTI. | en_GB |
dc.language.iso | en | en_GB |
dc.publisher | ETH Zurich | en_GB |
dc.rights | info:eu-repo/semantics/restrictedAccess | en_GB |
dc.subject | Turbulence | en_GB |
dc.subject | Buildings | en_GB |
dc.subject | Engineering -- Case studies | en_GB |
dc.subject | Physical sciences | en_GB |
dc.subject | Mechanics | en_GB |
dc.subject | Turbulent boundary layer | en_GB |
dc.title | Connecting the time evolution of the turbulence interface to coherent structures | en_GB |
dc.title.alternative | Objective coherent structures near the turbulent/non-turbulent interface in a stably stratified turbulent flow | en_GB |
dc.type | bookPart | en_GB |
dc.rights.holder | The copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder | en_GB |
dc.description.reviewed | peer-reviewed | en_GB |
dc.identifier.doi | 10.3929/ethz-b-000476303 | - |
Appears in Collections: | Scholarly Works - FacEngME |
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Connecting_the_time_evolution_of_the_turbulence_interface_to_coherent_structures.pdf Restricted Access | 5.14 MB | Adobe PDF | View/Open Request a copy |
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