Abstract
Two different subgrid-scale scalar flux models, namely isotropic and anistropic representation, for the dynamic procedure using finite difference method are derived following the procedure proposed in the previous reports. The proposed models have been assessed on plane turbulent channel flow with passive scalar transport at various grid resolutions and are found to show better agreement with DNS results than those of Smagorinsky's model. The isotropic model is improved to be anisotropic representation by considering the effect of GS velocity gradient on the SGS scalar flux and using the results of a priori test obtained by the LES of a finer grid resolution. The anisotropic model mitigates the isotropic one's overestimation of scalar intensity and streamwise scalar flux near the wall. The notable feature of the proposed models is their insensitivity to the discrete form of the test filtering operation applied during the implementation of the dynamic procedure, which clearly indicates the validity of the proposed models for use in the context of finite difference method.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
