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-   -   [GAMBIT] Grid spacing calculator (http://www.cfd-online.com/Forums/ansys-meshing/81547-grid-spacing-calculator.html)

aamer October 29, 2010 15:58

Grid spacing calculator
 
Hello All...

There is a GUI of calculating grid spacing geolab.larc.nasa.gov/APPS/YPlus/ -

it requires Reynolds number, Reference length and value of Y+ in order to give grid spacing "ds" as output. Can anyone please tell me the formulae or steps working behind this interface, that calculate ds

olivier78 November 22, 2010 08:11

Did you find out about how it computes the grid cell size ?

aamer November 23, 2010 03:37

Still waiting for replies....

PSYMN November 24, 2010 11:18

A quick web search...
 
http://www.cfd-online.com/Wiki/Dimen...stance_(y_plus)

http://www.cfd-online.com/Forums/mai...lculate-y.html

Etc...

olivier78 November 27, 2010 21:44

it is about cell size more than yplus really
 
thanks for the link Simon,
I was just wondering how the nasa calculator was working.
it requires a Reynolds number, a y+ value and a characteristic lenght. I presume it is also using the viscosity. it provides a cell size as an output.
I was thinking using that tool to give me idea an idea of the miniumum and maximum mesh cell size needed as it links yplus to cell size.
However I liked to know how it works. rather than using it blindly.

olivier78 November 27, 2010 23:00

Aamer,

I think i have worked out their formula, not sure though. check it up !

Ds= Re^(-0.9) . y+ . Lenght . 5.7 that for S.I

http://geolab.larc.nasa.gov/APPS/YPlus/

PSYMN November 28, 2010 20:54

Go to the source?
 
It is a long shot since the page was last edited 13 years ago... but you could always ask its creator, Bill Jones... His email is at the bottom left of the web page. If his email is out of date, you could try to find him on linked in...


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