Change search
ReferencesLink to record
Permanent link

Direct link
Statistical characteristics of two-dimensional and quasigeostrophic turbulence
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Two codes have been developed and implemented for use on massively parallelsuper computers to simulate two-dimensional and quasigeostrophic turbulence.The codes have been found to scale well with increasing resolution and width ofthe simulations. This has allowed for the highest resolution simulations of two-dimensional and quasigeostrophic turbulence so far reported in the literature.The direct numerical simulations have focused on the statistical characteristicsof turbulent cascades of energy and enstrophy, the role of coherent vorticesand departures from universal scaling laws, theoretized more than 40 yearsago. In particular, the investigations have concerned the enstrophy and energycascade in forced and decaying two-dimensional turbulence. Furthermore, theapplicability of Charney’s hypotheses on quasigeostrophic turbulence has beentested. The results have shed light on the flow evolution at very large Reynoldsnumbers. The most important results are the robustness of the enstrophycascade in forced and decaying two-dimensional turbulence, the unexpecteddependency on an infrared Reynolds number in the spectral scaling of theenergy spectrum in the inverse energy cascade, and the validation of Charney’spredictions on the dynamics of quasigeostrophic turbulence. It has also beenshown that the scaling of the energy spectrum in the enstrophy cascade isinsensitive to intermittency in higher order statistics, but that corrections mightapply to the ”universal” Batchelor-Kraichnan constant.

Place, publisher, year, edition, pages
Stockholm: KTH , 2010. , vii, 48 p.
Trita-MEK, ISSN 0348-467X ; 2010:05
Keyword [en]
two-dimensional turbulence, decaying turbulence, quasigeostrophic turbulence, direct numerical simulation (DNS), coherent vortices, energy cas- cade, enstrophy cascade, intermittency, massively parallel simulations
National Category
Other Physics Topics
URN: urn:nbn:se:kth:diva-13128ISBN: 978-91-7415-679-9OAI: diva2:321121
2010-06-14, E2, Lindstedtsvägen 3, KTH, Stockholm, 10:15 (English)
Available from: 2010-05-31 Created: 2010-05-28 Last updated: 2010-05-31Bibliographically approved

Open Access in DiVA

fulltext(1753 kB)343 downloads
File information
File name FULLTEXT01.pdfFile size 1753 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Vallgren, Andreas
By organisation
Linné Flow Center, FLOW
Other Physics Topics

Search outside of DiVA

GoogleGoogle Scholar
Total: 343 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 144 hits
ReferencesLink to record
Permanent link

Direct link