how to use the "yPlusRAS"utility
Hi foamers
I'm solving a channel folw case with the kEpsilon model.I want the put out the Y+ and U+, but I don't know how to use the YPlusRAS utility. What's more I don't know how to get the U+. So help me please~ Thanks. |
You can just use the yPlusRAS utility from the command-line, what is not clear about it?
I think generally, the yPlusRAS utility will calculate y*, and not y+. |
In addition to Bernhard's comment, take a look at the thread
http://www.cfd-online.com/Forums/ope...-testcase.html but make sure to take the time to read through the thread. There are corrections to the provided application and discussion about using of the contributed utility. The link I provided will give you a utility to calculate y+ and u+ and is used for low Reynolds number flows. |
Just like you said, I have use the yPlusRAS utility from the command-line. But I got an error ——
cannot open file file: /home/sun/OpenFOAM/sun-2.1.1/1112/constant/transportProperties at line 0. From function regIOobject::readStream() in file db/regIOobject/regIOobjectRead.C at line 87. FOAM exiting While there is no the transportProperties file in my case actually because I use the rhoPimpleFoam solver for my case and it maybe a bad choice for me to choose this solver. At first, I want to apply a solver from the incompressible directory because my case is a simple channel flow (1, low Re number; 2, the temperature of the inlet air is 300k,the temperature of the wall is 310k; 3, epsilon=46,k=0.7) While I find that all the cases in the incompressible directory have no dealing with the temperature and I don't know how to add it in the solver, so I chose the rhoPimpleFoam solver for my case and I don't know if it is a right one. In your opinion, what solver should I choose? What's more, what is y* ? |
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First, thanks for your reply. Just like you said, I have use the yPlusRAS utility from the command-line. But I got an error —— cannot open file file: /home/sun/OpenFOAM/sun-2.1.1/1112/constant/transportProperties at line 0. From function regIOobject::readStream() in file db/regIOobject/regIOobjectRead.C at line 87. FOAM exiting While there is no the transportProperties file in my case actually because I use the rhoPimpleFoam solver for my case and it maybe a bad choice for me to choose this solver. At first, I want to apply a solver from the incompressible directory because my case is a simple channel flow (1, low Re number; 2, the temperature of the inlet air is 300k,the temperature of the wall is 310k; 3, epsilon=46,k=0.7) While I find that all the cases in the incompressible directory have no dealing with the temperature and I don't know how to add it in the solver, so I chose the rhoPimpleFoam solver for my case and I don't know if it is a right one. In your opinion, what solver should I choose? What's more, what is y* ? |
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Dear Dan Thanks for your reply. It's very helpful for me. Thanks again!:) |
since you are using a compressible solver, use yplusRAS -compressible
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Thanks for your reply. I will have a try. Best Sunxing |
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Hi, Can you give me a exact explaination of y*? I don't know what does it stand for. thanks! |
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http://www.cfd-online.com/Forums/ope...lus-ystar.html |
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Thank you very much Sunxing |
Just an update, the yPlus tool has been moved into the solvers:
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yPlus has been superceded by the '-postProcess' solver command-line option, e.g. |
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