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Predicting Fully-developed Channel Flow with Zero-equation Model

A new zero-equation model (ZEM) is devised with an eddy-viscosity formulation using a stress length variable which the structural ensemble dynamics (SED) theory predicts. The ZEM is distinguished by obvious physical parameters, quantifying the underlying flow domain with a universal multilayer st...

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Tallennettuna:
Päätekijät: Rahman, M. M., Hasan, K., Liu, Wenchang, Li, Xinming
Aineistotyyppi: Artikkeli
Kieli:englanti
Julkaistu: R&D Wing, MIST 2022
Aiheet:
y-phrases, Algebraic model, SED theory, Stress length, Stress-intensity parameter, Wall turbulence
Linkit:http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/686
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Yhteenveto:A new zero-equation model (ZEM) is devised with an eddy-viscosity formulation using a stress length variable which the structural ensemble dynamics (SED) theory predicts. The ZEM is distinguished by obvious physical parameters, quantifying the underlying flow domain with a universal multilayer structure. The SED theory is also utilized to formulate an anisotropic Bradshaw stress-intensity factor, parameterized with an eddy-to-laminar viscosity ratio. Bradshaw’s structure-function is employed to evaluate the kinetic energy of turbulence k and turbulent dissipation rate 𝜺𝜺. The proposed ZEM is intrinsically plausible, having a significant impact on the prediction of wall-bounded turbulence.

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