| VLES Modelling with the Renormalization Group |
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| 作者姓名： | Chris De Langhe rug.ac.be Bart Merci rug.ac.be Koen Lodefier rug.ac.be Erik Dick rug.ac.be |
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| 作者单位： | Ghent University，Dept. of Flow，Heat and Combustion Mechanics，Sint-Pietersnieuwstraat 41，B-9000 Gent，Belgium，E-mail: Chris.DeLanghe，Ghent University，Dept. of Flow，Heat and Combustion Mechanics，Sint-Pietersnieuwstraat 41，B-9000 Gent，Belgium，E-mail: Chris.DeLanghe，Ghent University，Dept. of Flow，Heat and Combustion Mechanics，Sint-Pietersnieuwstraat 41，B-9000 Gent，Belgium，E-mail: Chris.DeLanghe，Ghent University，Dept. of Flow，Heat and Combustion Mechanics，Sint-Pietersnieuwstraat 41，B-9000 Gent，Belgium，E-mail: Chris.DeLanghe |
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| 摘 要： | In a Very-Large-Eddy Simulation (VLES), the filterwidth-wavenumber can be outside the inertial range, and simple subgrid models have to be replaced by more complicated ('RANS-like') models which can describe the transport of the biggest eddies. One could approach this by using a RANS model in these regions, and modify the lengthscale in the model for the LES-regions1-3]. The problem with these approaches is that these models are specifically calibrated for RANS computations, and therefore not suitable to describe inertial range quantities. We investigated the construction of subgrid viscosity and transport equations without any calibrated constants, but these are calculated directly form the Navier-Stokes equation by means of a Renormalization Group (RG) procedure. This leads to filterwidth dependent transport equations and effective viscosity with the right limiting behaviour (DNS and RANS limits).
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| 关 键 词： | very-large-eddy simulation subgrid modellig k-ε model. |
VLES modelling with the Renormalization Group |
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| Chris De Langhe,rug.ac.be
,Bart Merci,rug.ac.be
,Koen Lodefier,rug.ac.be
,Erik Dick,rug.ac.be.VLES Modelling with the Renormalization Group[J].Journal of Thermal Science,2003,12(4):328-331. |
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| Authors: | Chris De Langhe Bart Merci Koen Lodefier Erik Dick |
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| Affiliation: | (1) Dept. of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Gent, Belgium |
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| Abstract: | In a Very-Large-Eddy Simulation (VLES), the filterwidth-wavenumber can be outside the inertial range, and simple subgrid models have to be replaced by more complicated ('RANS-like') models which can describe the transport of the biggest eddies. One could approach this by using a RANS model in these regions, and modify the lengthscale in the model for the LES-regions1-3]. The problem with these approaches is that these models are specifically calibrated for RANS computations, and therefore not suitable to describe inertial range quantities. We investigated the construction of subgrid viscosity and transport equations without any calibrated constants, but these are calculated directly form the Navier-Stokes equation by means of a Renormalization Group (RG) procedure. This leads to filterwidth dependent transport equations and effective viscosity with the right limiting behaviour (DNS and RANS limits). |
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| Keywords: | very-large-eddy simulation subgrid modellig k-ɛ model |
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