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- Bensow, Rickard, 1972
(författare)
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Simulation of the unsteady cavitation on the the Delft Twist11 foil using RANS, DES and LES
- 2011
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Ingår i: 2nd International Symposium on Marine Propulsors, Workshop proceedings.
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Konferensbidrag (refereegranskat)abstract
- The unsteady sheet cavitation on the Delft Twist11 foil is simulated using RANS, DES, and LES. Focus of the anal- ysis is for the LES results, but comparisons are made to the results of the other approaches. The LES is run with implicit subgrid modeling while the RANS and DES both are run using the Spalart-Almaras model in order to re- duce the differences between the approaches; in the case of the DES the improved formulation called Delayed DES is used. RANS simulations are performed both with the standard formulation and with the correction proposed by Reboud. The LES gives satisfactory results given the mesh resolution with the major mechanisms governing the shed- ding dynamics captured giving a shedding frequency of 34 Hz compared with the experimentally determined fre- quency of 32.55 Hz. The extent of the cavity is however slightly small and the lift is low. Also the DES agrees rea- sonably well with the experiments while RANS with the correction give a shedding behavior but the mechanisms are not as well represented as in the LES or the DES. The standard formulation of the RANS gives a stationary cavity.
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- Di Baldassarre, Giuliano, et al.
(författare)
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Analysis of the effects of levee heightening on flood propagation : example of the River Po, Italy
- 2009
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Ingår i: Hydrological Sciences Journal. - : Informa UK Limited. - 0262-6667 .- 2150-3435. ; 54:6, s. 1007-1017
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Tidskriftsartikel (refereegranskat)abstract
- The effects of human activities on flood propagation, during the period 1878-2005, in a 190-km reach of the middle-lower portion of the River Po (Northern Italy) are investigated. A series of topographical, hydrological and inundation data were collected for the 1878 River Po geometry and the June 1879 flood event, characterised by an inundated area of 432 km(2). The aim of the study is two-fold: (1) to show the applicability of flood inundation models in reconstructing historical inundation events, and (2) to assess the effects of human activities during the last century on flood propagation in the middle-lower portion of the River Po. Numerical simulations were performed by coupling a two-dimensional finite element code, TELEMAC-2D, with a one-dimensional finite difference code, HEC-RAS.
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