UFR 3-18 Best Practice Advice

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Description

Test Case Studies

Evaluation

Best Practice Advice

References

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.

© copyright ERCOFTAC 2004

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Contributors: Fred Mendonca - Computational Dynamics Ltd

Front Page

Description

Test Case Studies

Evaluation

Best Practice Advice

References