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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03642naa a2200385 4500 | |
| 001 | oai:DiVA.org:kth-292088 | |
| 003 | SwePub | |
| 008 | 210329s2021 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2920882 URI |
| 024 | 7 | a https://doi.org/10.1017/jfm.2020.9182 DOI |
| 040 | a (SwePub)kth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Nogueira, Petronio A. S.u Inst Tecnol Aeronaut, Div Engn Aeronaut, BR-12228900 Sao Jose Dos Campos, SP, Brazil.4 aut |
| 245 | 1 0 | a Forcing statistics in resolvent analysis :b application in minimal turbulent Couette flow |
| 264 | c 2020-12-10 | |
| 264 | 1 | b Cambridge University Press (CUP),c 2021 |
| 338 | a print2 rdacarrier | |
| 500 | a QC 20210329 | |
| 520 | a An analysis of the statistics of the nonlinear terms in resolvent analysis is performed in this work for turbulent Couette flow at Reynolds number 400. Data from a direct numerical simulation of a minimal flow unit is used to compute the covariance matrix of the velocity. From the same data, we computed the nonlinear terms of the Navier-Stokes equations (treated as forcing), which allowed us to compute the covariance matrix of the forcing. The quantitative relation between the two covariances via the resolvent operator is confirmed here for the first time, accounting for relevant signal processing issues related to the windowing procedure for frequency-domain quantities. Such exact correspondence allowed the eduction of the most relevant force components for the dominant structures in this flow, which participate in the self-sustaining cycle of turbulence: (i) streamwise vortices and streaks, and (ii) spanwise-coherent fluctuations of spanwise velocity. The results show a dominance by a subset of the nonlinear terms for the prediction of the full statistics of streamwise vortices and streaks; a single term is seen to be dominant for spanwise motions. A relevant feature observed in these cases is that the forcing covariance is dominated by its first eigenfunction, showing that nonlinear terms also have a coherent structure at low frequencies in this flow. Different forcing components are also coherent between them, which leads to constructive and destructive interferences that greatly modify the flow response. These are key features of forcing 'colour' for the present flow. | |
| 650 | 7 | a TEKNIK OCH TEKNOLOGIERx Maskinteknik0 (SwePub)2032 hsv//swe |
| 650 | 7 | a ENGINEERING AND TECHNOLOGYx Mechanical Engineering0 (SwePub)2032 hsv//eng |
| 653 | a turbulence modelling | |
| 653 | a turbulence simulation | |
| 700 | 1 | a Morra, Pierluigiu KTH,Linné Flow Center, FLOW,Teknisk mekanik,SeRC - Swedish e-Science Research Centre4 aut0 (Swepub:kth)u11hmzyh |
| 700 | 1 | a Martini, Eduardou Inst Tecnol Aeronaut, Div Engn Aeronaut, BR-12228900 Sao Jose Dos Campos, SP, Brazil.4 aut |
| 700 | 1 | a Cavalieri, Andre V. G.u Inst Tecnol Aeronaut, Div Engn Aeronaut, BR-12228900 Sao Jose Dos Campos, SP, Brazil.4 aut |
| 700 | 1 | a Henningson, Dan S.u KTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre,Teknisk mekanik4 aut0 (Swepub:kth)u1xtilpr |
| 710 | 2 | a Inst Tecnol Aeronaut, Div Engn Aeronaut, BR-12228900 Sao Jose Dos Campos, SP, Brazil.b Linné Flow Center, FLOW4 org |
| 773 | 0 | t Journal of Fluid Mechanicsd : Cambridge University Press (CUP)g 908q 908x 0022-1120x 1469-7645 |
| 856 | 4 | u http://arxiv.org/pdf/2001.02576 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292088 |
| 856 | 4 8 | u https://doi.org/10.1017/jfm.2020.918 |
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