publication . Article . 2012

Large eddy simulation of smooth-wall, transitional and fully rough-wall channel flow

Saito, Namiko; Pullin, Dale I.; Inoue, Michio;
Open Access
  • Published: 01 Jul 2012
  • Publisher: American Institute of Physics
  • Country: United States
Abstract
Large eddy simulation (LES) is reported for both smooth and rough-wall channel flows at resolutions for which the roughness is subgrid. The stretched vortex, subgrid-scale model is combined with an existing wall-model that calculates the local friction velocity dynamically while providing a Dirichlet-like slip velocity at a slightly raised wall. This wall model is presently extended to include the effects of subgrid wall roughness by the incorporation of the Hama's roughness function ΔU^+(k^+_(s∞)) that depends on some geometric roughness height k_(s∞) scaled in inner variables. Presently Colebrook's empirical roughness function is used but the model can utilize...
Subjects
arXiv: Physics::Fluid Dynamics
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Article . 2012
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