# [GAMBIT] Grid spacing calculator

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 October 29, 2010, 14:58 Grid spacing calculator #1 Member   Aamer Shahzad Join Date: Mar 2010 Posts: 58 Rep Power: 9 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

 November 22, 2010, 08:11 #2 New Member   Olivier Benichou Join Date: Sep 2010 Location: Brisbane Posts: 10 Rep Power: 9 Did you find out about how it computes the grid cell size ?

 November 23, 2010, 03:37 #3 Member   Aamer Shahzad Join Date: Mar 2010 Posts: 58 Rep Power: 9 Still waiting for replies....

 November 24, 2010, 11:18 A quick web search... #4 Retired from CFD Online     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,665 Blog Entries: 1 Rep Power: 39

 November 27, 2010, 21:44 it is about cell size more than yplus really #5 New Member   Olivier Benichou Join Date: Sep 2010 Location: Brisbane Posts: 10 Rep Power: 9 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.

 November 27, 2010, 23:00 #6 New Member   Olivier Benichou Join Date: Sep 2010 Location: Brisbane Posts: 10 Rep Power: 9 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/

 November 28, 2010, 20:54 Go to the source? #7 Retired from CFD Online     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,665 Blog Entries: 1 Rep Power: 39 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 If his email is out of date, you could try to find him on linked in...

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