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- Kleinhans, David, 1979, et al.
(författare)
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Synthetic turbulence models for wind turbine applications
- 2010
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Ingår i: Springer Proceedings in Physics. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 0930-8989 .- 1867-4941. ; 131, s. 111-114
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Konferensbidrag (refereegranskat)abstract
- Wind energy converters such as wind turbines permanently work in the atmospheric boundary layer. For the modelling of the dynamics and for the optimisation of design and material of wind turbines synthetic models for atmospheric turbulence are applied already for a long time. The main purpose of these models is to provide fast and efficient methods for numerical simulation of random fields, that show some characteristic features of atmospheric turbulence. Typically they only have a partial connection to the fundamental equations of fluid dynamics. After a short overview summarizing widespread models by Veers and Mann, that are based on the simulation of random fields in the Fourier domain, advanced models for the simulation of velocity fields are discussed.
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| 2. |
- Kleinhans, David, 1979, et al.
(författare)
-
The role of asymmetric dispersal in metapopulations
- 2009
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Ingår i: Presented at First Swedish meeting on Theory and Mathematics in Biology and Medicine, Uppsala, December 17th and 18th, 2009.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Metapopulations consist of a number of sub-populations connectedthrough the dispersal of migrants. In many theoretical approachesoften rather simple dispersal patterns are investigated, whiletypically complex dispersal patterns are observed in nature. Thisespecially is the case for larvae dispersal in marine environmentsdriven by ocean currents.In a recent work Vuilleumier and Possingham investigate the role ofsymmetry in dispersal patterns and draw the conclusion, thatasymmetric dispersal has a distinct negative impact on populationviability. Our results based on artificial dispersal patterns,however, suggest that symmetry actually only could have a vanishingimpact. The simulation results are in good agreement with tests onrealistic dispersal patterns of mussel larvae in the Baltic Sea.We demonstrate the importance of artificially generated dispersalpatterns for the disentanglement of the complexity intrinsic tonatural systems. Although many aspects of larvae dispersal might notyet have been understood we can draw the conclusion, that asymmetrymight not be as severe as expected by Vuilleumier and Possingham. Thatis of course good news for many systems of biological relevance.
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