On the grid sensitivity of the k-ω turbulence model
Author L. Eça and M. Hoekstra
Title On the grid sensitivity of the k-ω turbulence model
Conference/Journal Journal Fluids Engineering
Year 2004

Abstract
This paper presents a study on the k-ω turbulence model with regard to the numerical implementation of the ω boundary condition at a solid wall, where ω tends to infinity. Three different implementations are tested in the calculation of a simple 2-D turbulent flow over a flat plate. Grid refinement studies in grids with different near-wall grid line spacings are performed to assess the numerical uncertainty of the predicted drag coefficient, CD. The results are compared with the predictions of several alternative algebraic, one-equation and two-equation eddy-viscosity turbulence models. For the same level of grid refinement, the estimated uncertainty of CD obtained with the k-ω model is one order of magnitude larger than for all the other models.

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