We are excited to announce that the repository will soon undergo an upgrade, featuring a new look and feel along with several enhanced features to improve your experience. Please be on the lookout for further updates and announcements regarding the launch date. We appreciate your support and look forward to unveiling the improved platform soon.
dc.contributor.author | Eljack, E.M.![]() |
|
dc.contributor.author | Kajishima, T.![]() |
|
dc.date.accessioned | 2014-12-03T08:38:09Z | |
dc.date.available | 2014-12-03T08:38:09Z | |
dc.date.issued | 2007 | |
dc.description.abstract | Paper presented at the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July, 2007. | en_US |
dc.description.abstract | Low dimensional POD-Galerkin model is developed for a fully developed turbulent channel flow. This model is based on the extraction of the Proper Orthogonal Decomposition (POD) eigenfunctions from a DNS data set of a channel flow at Re¿ = 150. The POD eigenfunctions are optimal in energy sense and ordered with the first eigenfunction represents the most energetic structure. POD analysis shows that, POD mode 1, 2 and 3 capture 63 %, 18% and 8.5% of total kinetic energy, respectively. Stream-wise mode zero (stream-wise rolls) contains about 22% of total energy. A Galerkin projection is then used to drive dynamical systems. To investigate coherent structures near the wall in a low dimensional system, only energetic modes are considered. The coupling of stream-wise and wallnormal velocity components is sustained by the implicit coupling in the POD eigenfunctions. Statistics of the flow which is generated by the model compare fairly well with the corresponding POD reconstruction of DNS data from which POD basis are extracted. | en_US |
dc.description.librarian | cs2014 | en_US |
dc.format.extent | 6 pages | en_US |
dc.format.medium | en_US | |
dc.identifier.citation | Eljack, EM & Kajishima, T 2007, Low dimensional POD-Galerkin modeling of rolling mode in a fully developed turbulent channel flow, Paper presented to the 5th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 1-4 July 2007. | en_US |
dc.identifier.isbn | 9781868546435 | |
dc.identifier.uri | http://hdl.handle.net/2263/42758 | |
dc.language.iso | en | en_US |
dc.publisher | International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics | en_US |
dc.relation.ispartof | HEFAT 2007 | |
dc.rights | University of Pretoria | en_US |
dc.rights.uri | University of Pretoria | en_US |
dc.subject | POD-Galerkin model | en_US |
dc.subject | Stream-wise mode zero | en_US |
dc.subject | Proper orthogonal decomposition | en_US |
dc.subject | Stream-wise rolls | en_US |
dc.title | Low dimensional POD-Galerkin modeling of rolling mode in a fully developed turbulent channel flow | en_US |
dc.type | Presentation | en_US |