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April 11, 2018, 04:16 |
Reference length for y+ estimation
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#1 |
Senior Member
Nejc
Join Date: Feb 2017
Location: Slovenia
Posts: 196
Rep Power: 9 |
Hello.
I understand that reference length in case of a flat plate of length 1m would be 1m. But I'm trying to mesh a whole pump. The overall length of the body is known but the shape is far from a flat plate or even a pipe. How do I choose the reference size for such cases? Thanks! |
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April 11, 2018, 04:35 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,769
Rep Power: 71 |
Quote:
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April 11, 2018, 04:47 |
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#3 | |
Senior Member
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Quote:
And for reference length for meshing etc. consider smallest and more important feature of geometry. Like diameter of hole or diameter of pipe or width of some face etc. |
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April 11, 2018, 06:05 |
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#4 |
Senior Member
Nejc
Join Date: Feb 2017
Location: Slovenia
Posts: 196
Rep Power: 9 |
So a good guess in my pump case would be inlet pipe diameter?
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April 11, 2018, 07:11 |
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#5 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,769
Rep Power: 71 |
y+ is a function, not a value. For example, it starts from y+=0 at the wall pipe and reach the value of the Reynolds number (with radius as lenght) at the center of the pipe. The characteristic velocity u_tau is based on the stress at the wall
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April 11, 2018, 08:29 |
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#6 |
Senior Member
Nejc
Join Date: Feb 2017
Location: Slovenia
Posts: 196
Rep Power: 9 |
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