Abstract
A summary and evaluation is given of the computational predictions
made by 3 independent teams using a total of 4 different
two-equation models and 3 different Reynolds stress models. The
results, in terms of mean velocity, turbulent kinetic energy,
Reynolds stress and coefficient of skin friction, are compared
mutually and to available experimental results obtained by laser
Doppler anemometry. Differences in results obtained with the same
turbulence model are ascribed to differences in implementation and
meshes, while differences between models clearly reveal strengths
and deficiencies of models. Results on skin friction, in
particular, show surprisingly large differences for the different
models. The standard k,epsilon-model with wall functions performs
better than the low-Re k,epsilon-model throughout the
recirculation region. In general, Reynolds stress models,
particularly those for low-Re number, are superior to two-equation
models, but all models underpredict the turbulence level in the
shear layer over and downstream of the recirculation region. The
new q,zeta-model performs roughly as the low-Re k,epsilon-model,
which it replaces, but it has an improved computational efficiency.
Original language | English |
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Journal | Notes on Numerical Fluid Mechanics |
Volume | 65 |
Pages (from-to) | 154-161 |
Publication status | Published - 1998 |