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December 23, 2019, 01:06 |
Unable to get Yplus less than 1
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#1 |
New Member
Zohaib Altaf
Join Date: Aug 2019
Location: Pakistan
Posts: 9
Rep Power: 7 |
Hello!
I am working on a developing flow through diffusing duct of aircraft. Boundary conditions: pressure inlet & mass flow outlet Model: k-omega SST I am stuck in the results of yplus i.e. Area weighted average of yplus at wall = ~70 As, model demands y+<1. I have checked different mesh sizes (b/w 1-20 million cells) but unable to get y+<1. 1st cell height = ~ 1x10^-6 Layers=~ 42 Height ratio = 1.2 Please help me in this. Thanks |
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December 25, 2019, 07:25 |
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#2 |
New Member
João de Sousa Bomfim Neto
Join Date: Oct 2017
Location: Maranguape, Ceará, Brasil
Posts: 27
Rep Power: 9 |
Hi. How you obtained y+ value?
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January 1, 2020, 02:44 |
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#3 |
New Member
Zohaib Altaf
Join Date: Aug 2019
Location: Pakistan
Posts: 9
Rep Power: 7 |
Using area weighted average over the wall
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January 2, 2020, 06:03 |
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#4 |
Senior Member
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January 16, 2020, 12:59 |
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#5 |
New Member
Zohaib Altaf
Join Date: Aug 2019
Location: Pakistan
Posts: 9
Rep Power: 7 |
thank you, i have also used plot tool and it shows different values at different patches
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January 16, 2020, 13:01 |
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#6 |
New Member
Zohaib Altaf
Join Date: Aug 2019
Location: Pakistan
Posts: 9
Rep Power: 7 |
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January 17, 2020, 01:40 |
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#7 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,740
Rep Power: 66 |
It's clear what you have to do to get a smaller wall y+. Make smaller cells there.
You probably will never get the wall y+ <1 globally. You can tinker with it for a month and you might end up with one location where it is 2. |
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Tags |
developing flow, diffusers, duct flow, k-w sst, yplus |
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