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April 28, 2005, 04:44 |
Hi,
A simple question.
H
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#1 |
New Member
Rasmus Gjesing
Join Date: Mar 2009
Posts: 7
Rep Power: 17 |
Hi,
A simple question. How is wall-functions for RANS disabled and enabled? To me, it looks like in turbulenceProperties that wall-functions can be chosen on the same level as choosing the k-epsilon model. But I can also see in the implementation of the turbulence models that the source files for the wall-functions are included. Thanks in advance, Rasmus |
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April 28, 2005, 04:47 |
All high-Re RANS turbulence mo
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#2 |
Senior Member
Join Date: Mar 2009
Posts: 854
Rep Power: 22 |
All high-Re RANS turbulence models include wall-functions because it is inappropriate to use them without. Only the low-Re models operate without wall-functions as they include model-specific wall treatments.
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May 4, 2005, 03:14 |
Sorry, I forgot to mention abo
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#3 |
Member
Masashi IMANO
Join Date: Mar 2009
Location: Tokyo, Japan
Posts: 34
Rep Power: 17 |
Sorry, I forgot to mention about my calculation setup's detail.
1. I'm running high-Re RANS. 2. I need to apply the rough wall function only to a ground and other walls should be calculated with normal slip wall function. So I would like to change wall functions whether a wall is a ground or not. Since I'm beginner about both OpenFOAM and C++ language;;, I would like to copy and modify the wall function sources directly, but I still need to switch wall functions with using information of the wall. [Q] How can I switch wall functions according to wall's information(name?) in RANS wall function sources? Thanks for your advice, Masashi IMANO |
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February 10, 2010, 10:01 |
Production term
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#4 |
New Member
anonymous
Join Date: Nov 2009
Location: Switzerland
Posts: 8
Rep Power: 16 |
Dear Henry and RANS-experts,
first of all, thank you for the improved near wall treatement (NWT) of kOmegaSST. I really appreciate it. However, to have a reliable NWT, 2 questions may arise: 1) Production term:
Andi Ps.: As english is not my mother tongue, some statements may sound a bit rude. If this is so, don't take it amiss. It was never my intention. |
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February 10, 2010, 10:17 |
Sorry
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#5 |
New Member
anonymous
Join Date: Nov 2009
Location: Switzerland
Posts: 8
Rep Power: 16 |
Sorry, wrong thread
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February 10, 2010, 23:55 |
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#6 |
Senior Member
Jiang
Join Date: Oct 2009
Location: Japan
Posts: 186
Rep Power: 16 |
I think it is very difficult to understand how wall function works in OpenFOAM.
When you select high Renolds number kEpsolon model, it will be automatically be used ? Or when you select nutWallFunction, it will be automatically used ? If velocity wall function will be automatically used, then temperature wall function how to use ? for example, buoyantBoussinesqSimpleFoam, It doesn't have a variable for temperature to use wall function. As far as I know, alphat wall function can only be used for compressible flow. Am I right? |
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