English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A new methodology based on energy flux similarity is suggested in this paperfor large eddy simulation (LES) of transitional and turbulent flows. Existingknowledge reveals that the energy cascade generally exists in transitional andturbulent flows with different distributions, and the characteristic quantityof scale interaction in energy cascade processes is energy flux. Therefore,energy flux similarity is selected as the basic criterion to secure the flowfield getting from LES highly similar to the real flow field. Through a prioritests, we find that the energy flux from the tensor-diffusivity (TD) model hashigh similarity with the real energy flux. Then, we modify the modelled energyflux from the TD model and obtain uniform formulas of energy flux similaritycorresponding to different filter widths and locations in the wall-boundedturbulence. To secure the robustness of simulation and the LES results similarto the real flow, we apply the energy flux similarity method (EFSM) to theSmagorinsky model in the LES of compressible turbulent channel flow,compressible flat-plate flow, and flow over a compressible ramp. The aposteriori tests show that, overall, EFSM can better predict these flows thanother subgrid-scale models. In the simulation of turbulent channel flow, EFSMcan accurately predict the mean stream-wise velocity, Reynolds stress, andaffluent coherent structures. In LES of compressible flat-plate flow, EFSMcould provide accurate simulation results of the onset of transition andtransition peak, skin friction, and mean stream-wise velocity in cases withthree different grid scales. Meanwhile, for flow over a compressible ramp, EFSMcould correctly describe the process of bypass transition, locations ofseparation and reattachment in the corner region, and abundant coherent vortexstructures, etc.

New methodology based on energy flux similarity for large-eddy simulation of transitional and turbulent flows