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How to create additional variable for the eddy viscosity ratio |
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October 24, 2013, 21:16 |
How to create additional variable for the eddy viscosity ratio
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#1 |
New Member
Tom
Join Date: Oct 2013
Location: Auckland, New Zealand
Posts: 24
Rep Power: 12 |
Hi there
Can anyone please tell me how to create an additional variable for the eddy viscosity ratio in CFX-pre so that I can use it in CFX-post for boundary layer flow separation analysis. Cheers Tom |
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October 24, 2013, 21:46 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
In CFD-Post, create a new variable (the "x" button) and give it the expression Eddy Viscosity/Dynamic Viscosity.
Pretty simple. |
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October 24, 2013, 23:38 |
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#3 |
New Member
Tom
Join Date: Oct 2013
Location: Auckland, New Zealand
Posts: 24
Rep Power: 12 |
Got it
Thanks Glenn |
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October 30, 2013, 03:36 |
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#4 |
Senior Member
Join Date: Jul 2010
Posts: 152
Rep Power: 15 |
may I ask what does it really express and how can I use it for cases?
Thank you |
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October 30, 2013, 05:00 |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
It tells you how much of the viscosity in the model comes from the turbulence model and how much comes from the laminar viscosity. As the model becomes highly turbulent this ratio gets large. For some applications a ratio of 1 is defined as the transition to turbulence (but in my opinion it is not a very good definition )
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