Spectrally-consistent regularization modeling of wind farm boundary layers
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Cita com:
hdl:2117/17948
Tipus de documentText en actes de congrés
Data publicació2012
Condicions d'accésAccés obert
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Abstract
The incompressible Navier-Stokes equations
constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively low-Reynolds numbers because of the almost numberless small scales produced by the non-linear
convective term. Alternatively, a dynamically less complex formulation is proposed here. Namely, regularizations of the Navier-Stokes equations that preserve the symmetry and conservation properties
exactly. To do so, both convective and diffusive term are altered in the same vein. In this way, the convective production of small scales is effectively restrained
whereas the modified diffusive term introduces a hyperviscosity effect and consequently enhances the destruction of small scales. In practise, the only
additional ingredient is a self-adjoint linear filter whose local filter length is determined from the requirement that vortex-stretching must stop at the smallest
grid scale. In the present work, the performance of the above-mentioned recent improvements is assessed through application to homogeneous isotropic turbulence, a turbulent channel flow and a turbulent
boundary layer. As a final application, regularization modelling will be applied for large-scale numerical simulation of the atmospheric boundary layer through
wind farms.
CitacióTrias, F. X. [et al.]. Spectrally-consistent regularization modeling of wind farm boundary layers. A: Conference on Modelling Fluid Flow. "Conference proceedings: Conference on Modelling Fluid Flow: CMFF'12: the 15th event of international conference series on fluid flow technologies held in Budapest". Budapest: 2012, p. 96-103.
Versió de l'editorhttp://cataleg.upc.edu/record=b1419227~S1*cat
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SPECTRALLY-CONS ... MODELLING OF WIND FARM.pdf | 194,2Kb | Visualitza/Obre |