種々のPr数流体に適応できる混合時間スケール温度場SGSモデル(熱工学,内燃機関,動力など)

概要

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A new subgrid-scale (SGS) model for thermal field is proposed. The model is an extended version of the mixed-time-scale SGS model for velocity field by Inagaki et al. (2005), where the hybrid time scale between the time scales of the velocity and thermal fileds is introduced and the wall-asymptotic behavior is satisfied by incorporating the wall-damping function for LES based on Kolmogorov velocity scale by Inagaki et al. (2006). The model performance is tested in plane channel flows at various Prandtl numbers, and the results show that this model gives Pr_<SGS> similar to that obtained by using dynamic Smagorinsky model with locally calculated model parameters. It is also shown that the proposed model predicts better mean and fluctuating temperature profiles than the Smagorinsky model and the dynamic Smagorinsky model. Since the present model is constructed with fixed model-parameters, it does not suffer from the computational instability with the dynamic model. Thus, it is expected to be a refined SGS model suited for practical LES of the thermal field.
2010-04-25