CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Wiki > Best practice guidelines for turbomachinery CFD

Best practice guidelines for turbomachinery CFD

From CFD-Wiki

(Difference between revisions)
Jump to: navigation, search
Line 1: Line 1:
== Meshing ==
== Meshing ==
-
== Boundary Conditions ==
+
== Boundary conditions ==
-
== Selection of Turbulence Model ==
+
== Selection of turbulence model ==
-
== Numerical Considerations ==
+
== Numerical considerations ==
-
== Multi-Stage Analysis ==
+
== Multi-stage analysis ==
-
== Heat Transfer Predictions ==
+
== Heat transfer predictions ==
-
== What to Trust and what Not to Trust ==
+
== 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. For heat transfer validation data is critical.
 +
 
 +
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 ==
== External Links ==
[http://www.qnet-cfd.net/newsletter/8th/n8_40-46.pdf QNET-CFD Best Practise Advice for Turbomachinery Internal Flows]
[http://www.qnet-cfd.net/newsletter/8th/n8_40-46.pdf QNET-CFD Best Practise Advice for Turbomachinery Internal Flows]

Revision as of 15:51, 7 September 2005

Contents

Meshing

Boundary conditions

Selection of turbulence model

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. For heat transfer validation data is critical.

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