Assessment of some self-adaptive SGS models for wall bounded flows |
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Institution: | 1. Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, and Department of Mechanics and Engineering Science, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, PR China;2. School of Electronical and Machanical Engineering, Xidian University, Xi''an, Shanxi 710071, P R China |
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Abstract: | Self-adaptive subgrid-scale models for large-eddy simulation of wall bounded flows using a second-order accurate numerical method are described and assessed on the plane channel flow configuration. These models do not include any information related to the location of the wall, and are based on the three following approaches: dynamic modelling as proposed by Germano, filtered models and selection function. These three techniques are found to be efficient, i.e. they yield vanishing subgrid viscosity when approaching the solid wall without any information related to its location. Strong sensitivity of the results to both Reynolds number and grid resolution is observed. The selection function is found to lead to the lowest subgrid-viscosity level. |
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