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http://dx.doi.org/10.18419/opus-13253
Autor(en): | Chu, Xu Wang, Wenkang Yang, Guang Terzis, Alexandros Helmig, Rainer Weigand, Bernhard |
Titel: | Transport of turbulence across permeable interface in a turbulent channel flow : interface-resolved direct numerical simulation |
Erscheinungsdatum: | 2020 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 165-189 |
Erschienen in: | Transport in porous media 136 (2021), S. 165-189 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-132726 http://elib.uni-stuttgart.de/handle/11682/13272 http://dx.doi.org/10.18419/opus-13253 |
ISSN: | 0169-3913 1573-1634 |
Zusammenfassung: | Turbulence transportation across permeable interfaces is investigated using direct numerical simulation, and the connection between the turbulent surface flow and the pore flow is explored. The porous media domain is constructed with an in-line arranged circular cylinder array. The effects of Reynolds number and porosity are also investigated by comparing cases with two Reynolds numbers (Re≈3000,6000) and two porosities (φ=0.5,0.8). It was found that the change of porosity leads to the variation of flow motions near the interface region, which further affect turbulence transportation below the interface. The turbulent kinetic energy (TKE) budget shows that turbulent diffusion and pressure transportation work as energy sink and source alternatively, which suggests a possible route for turbulence transferring into porous region. Further analysis on the spectral TKE budget reveals the role of modes of different wavelengths. A major finding is that mean convection not only affects the distribution of TKE in spatial space, but also in scale space. The permeability of the wall also have an major impact on the occurrence ratio between blow and suction events as well as their corresponding flow structures, which can be related to the change of the Kármán constant of the mean velocity profile. |
Enthalten in den Sammlungen: | 02 Fakultät Bau- und Umweltingenieurwissenschaften |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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s11242-020-01506-w.pdf | 8 MB | Adobe PDF | Öffnen/Anzeigen |
Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons