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How to choose the YPLUS value in two-phase flows? |
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February 10, 2007, 20:29 |
How to choose the YPLUS value in two-phase flows?
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#1 |
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For two-phase Euler-Euler multiphase model + turbulence model, how to select the reported "yplus" values for meeting the requirement of law-of-the-wall?
I mean, there are two "yplus" values from different phases (say, YPLUS for air & solid). Then, which one should be chosen for the grid adjustment? Especially, for the MIXTURE and DISPERSED models (k-epsilon multiphase turbulence model), how to make decision for the YPLUS value? Please give your idea. |
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December 7, 2015, 11:22 |
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#2 |
New Member
Jakub
Join Date: Sep 2015
Posts: 20
Rep Power: 10 |
Anyone knows ? Shall we move that topic, to "meshing problems". I need very much informations, about Yplus wall for water and air, becouse i working on two-phase flow around ship.
Thank You for sharing Your knowledge. You are great !! |
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December 7, 2015, 16:08 |
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#3 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,654
Rep Power: 65 |
There is no ambiguity in the meaning or definition of y+ for two-phase flows. Just because there may be two different phases in the domain, at a particular location the fluid can only be 1 phase. The exception is the VOF model which allows properties of different phases to be blurred together.
As for post-processing, there really is only one y+ value for the wall adjacent cell (whatever the wall adjacent value is). One y+ will be undefined for the phase that doesn't exist at the wall. Meshing is no different than single-phase simulation. If you want to predict the grid requirements, then that always requires some knowledge of the expected flow field. Otherwise you can do trial-and-error. |
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December 7, 2015, 16:43 |
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#4 |
New Member
Jakub
Join Date: Sep 2015
Posts: 20
Rep Power: 10 |
Thank You for your reply, Friend.
So If I have Volume of Fluid with Air and Water, that have diffrent y+ from calculator. Which Y+ should I choose ? |
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