A Wall Model Based on Simplified Thin Boundary Layer Equations for Implicit Large Eddy Simulation of Turbulent Channel Flow

2010 ◽  
pp. 59-66
Author(s):  
ZhenLi Chen ◽  
Antoine Devesa ◽  
Stefan Hickel ◽  
Christian Stemmer ◽  
Nikolaus A. Adams
Keyword(s):  
Boundary Layer ◽  
Large Eddy Simulation ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Thin Boundary Layer ◽  
Wall Model ◽  
Boundary Layer Equations ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Implicit Large Eddy Simulation

Large Eddy Simulation of Turbulent Flow Laden With Binary Mixture of Particles

2007 ◽  
Author(s):  
Neng-Tsung Chang ◽  
Chih-Hung Hsu ◽  
Keh-Chin Chang
Keyword(s):  
Binary Mixture ◽  
Large Eddy Simulation ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Wall Region ◽  
Wall Roughness ◽  
Wall Model ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Normal Particle

Particle-laden turbulent channel flow at Reτ = 644, loaded with binary mixture of particles, is numerically studied using the Lagrangian particle tracking method coupled with large eddy simulation. Turbulence statistics of different particle groups are analyzed. Two particle-wall models are applied to this study with / without considering wall roughness. Taking into considerations of rough wall model, the effect of wall roughness in the computations strengthens the wall-normal particle velocity fluctuations. As a result, particles tend to move from the near-wall region to the central core region. It leads to decrement of particle accumulation in the near-wall region as compared to the case considering the smooth wall model. The wall-normal particle mixing capability is enhanced which results in the redistribution of particles in the channel. The behavior of particle motion in the turbulent channel flow should be, thus, dependent on not only the value of Stokes number but also the wall roughness level.

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