Micro-Scale Scalar Transport in Turbulence

Tanahashi, Mamoru; Takata, Natsuki; Miyauchi, Toshio

doi:10.1299/jsmecmd.2000.13.147

Cited by 1 publication

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“…is the filtered vorticity tensor. As is well known, CS has relationships with the turbulent energy dissipation in turbulent flows [45,46] and the positive Q can represent vortex tubes. So Q or the second invariant also has relationships with the energy dissipation in turbulent flows regardless of its value being 074701-3 negative or positive.…”

Section: Governing Equations and Calculation Conditions 21 Concept Of...mentioning

confidence: 99%

“…This demonstrates that the currently proposed MCT SGS model is able to accurately describe the turbulent pulsating quantities in a drag-reduced turbulent flow of viscoelastic fluid. It has been well documented that the flow resistance in a turbulent channel flow can be greatly decreased by the addition of drag-reducing polymer/surfactant additives, leading to DR, [5][6][7][8][9][10]45,63] and the Reynolds shear stress has a direct quantitative relationship with the turbulent contribution to the friction factor in a wall-bounded turbulent flow. [64] Therefore, the quantitative prediction of the Reynolds shear stress is of crucial significance for turbulent channel flow with drag-reducing additives.…”

Section: Turbulent Channel Flowmentioning

confidence: 99%

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A new mixed subgrid-scale model for large eddy simulation of turbulent drag-reducing flows of viscoelastic fluids

Wang

Cai

2015

Chinese Phys. B

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A mixed subgrid-scale (SGS) model based on coherent structures and temporal approximate deconvolution (MCT) is proposed for turbulent drag-reducing flows of viscoelastic fluids. The main idea of the MCT SGS model is to perform spatial filtering for the momentum equation and temporal filtering for the conformation tensor transport equation of turbulent flow of viscoelastic fluid, respectively. The MCT model is suitable for large eddy simulation (LES) of turbulent drag-reducing flows of viscoelastic fluids in engineering applications since the model parameters can be easily obtained. The LES of forced homogeneous isotropic turbulence (FHIT) with polymer additives and turbulent channel flow with surfactant additives based on MCT SGS model shows excellent agreements with direct numerical simulation (DNS) results. Compared with the LES results using the temporal approximate deconvolution model (TADM) for FHIT with polymer additives, this mixed SGS model MCT behaves better, regarding the enhancement of calculating parameters such as the Reynolds number. For scientific and engineering research, turbulent flows at high Reynolds numbers are expected, so the MCT model can be a more suitable model for the LES of turbulent drag-reducing flows of viscoelastic fluid with polymer or surfactant additives.

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Section: Governing Equations and Calculation Conditions 21 Concept Of...mentioning

confidence: 99%