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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v37.i1.40
pages 42-69

Hydrodynamic Channel Flow Modeling Using Combined Large Eddy Simulation and Wall Functions

Mehdi Adjami
TMU (Tarbiat Modares University), Iran
Mehdi Shafieefar
Tarbiat Modares University, Tehran, Iran
Ali Akbar Salehi Neyshabouri
Tarbiat Modares University, Tehran, Iran

ABSTRAKT

Turbulent wall-bounded flows are commonly encountered in engineering practice and are of considerable interests in a variety of industrial applications. This presence of wall significantly affects turbulence characteristics. If we want to solve the near-wall region a very fine mesh is necessary. The number of points needed increases at least like Re1.8. This requirement makes the application of Large Eddy Simulation (LES) for high Reynolds (order of 106−108) practically impossible. One solution is to apply near-wall modification, or wall models with a coarse mesh near the wall. When the grid is not fine enough to resolve near-wall structure, the near-wall must be modeled by specifying a correlation between the velocity in first node and shear stress at the wall. The objective of this study is to implement wall-function for LES simulation of channel flow. The sub-grid scales are modeled using Smagorinsky and Wale model. The first node is placed at y+ ∼ 49 for Reτ = 4000 and 54 ≤ y+ ≤ 200 for Reτ = 16000. So the first node was located in log-law region and standard wall function was applied. Other modification was introduced in the calculation of the length-scale in the Smagorinsky model using the model proposed by Mason-Callen [7]. Another model introduced was the Werner-Wengler model [6].

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