Non-explicit large eddy simulations of turbulent channel flows from <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si15.svg"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mi>e</mml:mi><mml:mi>τ</mml:mi></mml:msub><mml:mo linebreak="goodbreak">=</mml:mo><mml:mn>180</mml:mn></mml:mrow></mml:math> up to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si80.svg"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mi>e</mml:mi><mml:mi>τ</mml:mi></mml:msub><mml:mo linebreak="…
نویسندگان
چکیده
This numerical study based on high-order finite-difference schemes presents LES-NWR (Large Eddy Simulation with near-wall resolution) of turbulent channel flows up to Reτ=5200 using non-explicit approaches for which dissipation is introduced via the discretisation viscous terms Navier-Stokes equations. These models are cheaper than explicit LES as no extra needed in equations account contribution unresolved scales. The Approximate Deconvolution Method Relaxation Term (ADM-RT) approach also assessed and present data compared reference Direct Numerical Simulations (DNS) first second order moments well kinetic energy budget. Even if sublayer not resolved, proposed excellent agreement DNS a certain extent ADM-RT model, fraction cost DNS. models, possibility locally adjust added investigated, straightforward implement come negligible additional computational while model 30% more expensive models.The parameters defined before simulations modifications when Reynolds number mesh resolution changed. It shown that modulation magnitude time space necessarily needed, at least resolutions numbers considered study. main conclusion can replace advantageously methods used. They generate accurate over wide range
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ژورنال
عنوان ژورنال: Computers & Fluids
سال: 2021
ISSN: ['0045-7930', '1879-0747']
DOI: https://doi.org/10.1016/j.compfluid.2021.105019