2D Boundary layers with pressure gradients (B)

Underlying Flow Regime 3-18 © copyright ERCOFTAC 2004

Best Practice Advice

Best Practice Advice for the UFR

The case studies associated with this UFR all demonstrate good practices, which for fully turbulent 2D boundary-layer separation in an adverse pressure gradient may be summarized as follows;

perform grid dependency studies to eliminate sensitivities due to mesh

assess the effect of sensitivity to boundary conditions by varying the critical inputs

use higher order discretisation, especially on momentum

use low-Reynolds non-linear models to capture the effect of near-wall non-isotropy and flow curvature in adverse pressure gradients. k-ω models predict separation better than the equivalent k-ε models

LES modeling is to be recommended where ever possible

The V2F turbulence model demonstrates good near-wall flow predictions, and should be investigated for a wider class of problems to boost confidence in its performance.

Contributors: Fred Mendonca - Computational Dynamics Ltd