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Showing results 1 to 8 of 8 Search took 0.00 seconds. Search: Posts Made By: ghorrocks

Forum: CFX August 17, 2010, 21:46

Replies: 24 Lift and Drag Monitor Point Values Converging to Zero Views: 9,928 Posted By ghorrocks Your hand calculation should be less accurate... Your hand calculation should be less accurate than the CFX calculator. The calculator should take into account the full integration points and control volumes whereas your calculations will only be...

Forum: CFX August 11, 2010, 06:27

Replies: 24 Lift and Drag Monitor Point Values Converging to Zero Views: 9,928 Posted By ghorrocks Interesting. I would report this to CFX support,... Interesting. I would report this to CFX support, sounds like a bug if you are correct. Best get it investigated and fixed.

Forum: CFX August 10, 2010, 22:03

Replies: 24 Lift and Drag Monitor Point Values Converging to Zero Views: 9,928 Posted By ghorrocks I guess the dissipation the turbulence model puts... I guess the dissipation the turbulence model puts in is enough to damp out any oscillations. That is what turbulence models are meant to do.

Forum: CFX August 10, 2010, 07:25

Replies: 24 Lift and Drag Monitor Point Values Converging to Zero Views: 9,928 Posted By ghorrocks Something is very strange here. I don't know what... Something is very strange here. I don't know what is wrong but here is some comments: 1) Convergence to 1e-5 should be more than adequate for most cases. You have gone way past that - something is...

Forum: CFX August 9, 2010, 22:40

Replies: 24 Lift and Drag Monitor Point Values Converging to Zero Views: 9,928 Posted By ghorrocks What does the overall lift and drag compare like?... What does the overall lift and drag compare like? Is your problem in calculating wall shear (ie post-processing) or in the simulation? You need to check whether you have a simulation problem or a...

Forum: CFX August 4, 2010, 19:39

Replies: 24 Lift and Drag Monitor Point Values Converging to Zero Views: 9,928 Posted By ghorrocks y+ is only defined for turbulent flows. It has no... y+ is only defined for turbulent flows. It has no meaning for laminar flows. To get adequate mesh resolution for a laminar flow you have to do a mesh sensitivity study. Yes, your flow may well not...

Forum: CFX August 4, 2010, 06:31

Replies: 24 Lift and Drag Monitor Point Values Converging to Zero Views: 9,928 Posted By ghorrocks Yes, I saw you are using the turb transition... Yes, I saw you are using the turb transition model. You can look at the intermittency variable to find where CFX is predicting the transition.

Forum: CFX August 3, 2010, 21:56

Replies: 24 Lift and Drag Monitor Point Values Converging to Zero Views: 9,928 Posted By ghorrocks This is a very low Re. Where is the transition... This is a very low Re. Where is the transition point? You may find that most of the foil is laminar. Have you tried a laminar only model?

Showing results 1 to 8 of 8

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