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Best practice guidelines for turbomachinery CFD

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Revision as of 17:40, 7 September 2005 by Jola (Talk | contribs)
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Contents

Deciding what type of simulation to do

2D, Quasi-3D or 3D

Inviscid or viscid

Transient or Stationary

Meshing

Boundary conditions

Turbulence modeling

Spalart-Allmares

Near Wall Treatment

Numerical considerations

Multi-stage analysis

Heat transfer predictions

What to trust and what not to trust

CFD is generally quite good at predicting surface static pressure distributions. With care CFD can also be used to predict performance, total-pressure losses and blade turning.

Predicting separation, stall and off-design performance can be a challenge and results with non-attached flows should be interpreted with care.

Heat transfer is often very difficult to predict accurately and it is common to obtain heat-transfer coefficients that are 100% wrong or more. Validation data is critical in order to be able to trust heat transfer simulations.

Transition is almost impossible to predict accurately in genereal. However, there exists models that have been tuned to predict transition and these tend to give acceptable results for cases close to the ones they were tuned for.

External links

QNET-CFD Best Practise Advice for Turbomachinery Internal Flows

My wiki