A framework to assess the quality and robustness of LES codes


Meyers, J. and Sagaut, P. and Geurts, B.J. (2006) A framework to assess the quality and robustness of LES codes. In: ASME 2nd Joint U.S.-European Fluids Engineering Summer Meeting, 17-20 July 2006, Miami, Florida, USA.

Abstract:We present a framework which can be used to rigourously assess and compare large-eddy simulation methods. We apply this to LES of homogeneous isotropic turbulence using three different discretizations and a Smagorinsky model. By systematically varying the simulation resolution and the Smagorinsky coefficient, one can determine parameter regions for which one, two or multiple flow predictions are simultaneously predicted with minimal error. To this end errors on the predicted longitudinal integral length scale, the resolved kinetic energy and the resolved enstrophy are considered. Parameter regions where all considered errors are simultaneously (nearly) minimal are entitled ‘multi-objective optimal’ parameter regions. Surprisingly, we find that a standard second-order method has a larger ‘multiobjective optimal’ parameter region than two considered fourth order methods. Moreover, the errors in the respective ‘multi-objective optimal’ regions are also lowest for the second-order scheme.
Item Type:Conference or Workshop Item
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/66869
Official URL:http://catalog.asme.org/ConferencePublications/PrintBook/2006_Proceedings_Joint_2.cfm
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