# [ANSYS Meshing] edge sizing control--Calculate cell-to-cell expansion rate from bias factor

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 May 15, 2011, 10:42 edge sizing control--Calculate cell-to-cell expansion rate from bias factor #1 Member   Join Date: May 2010 Posts: 44 Rep Power: 16 Hi Everyone, could someone tell me how to calculate first cell height and cell-to-cell growth rate from bias factor and number of cells? It would be very important. Anyway why does the Workbench Mesher use this kind of sizing (with bias factor) on the edges? Cell height and growth rate of successive cells is more useful IMO. Thanks for the answer in advance! ordinary likes this.

 May 15, 2011, 12:11 ohh I got it #2 Member   Join Date: May 2010 Posts: 44 Rep Power: 16 I figured it out... Using the following notations: Edge length L Number of cells n Total expansion ratio r (=bias factor in Ansys Meshing) Cell-to-cell expansion k (or geometric growth ratio) Start cell size ds End cell size de The equations to be fulfilled: L=sum(ds*k^i), i=0..n-1 de/ds=r=k^(n-1) From the above 3 equations any 3 of the 6 unknown mesh parameters can be calculated. See this thread too where a guy made a code to carry out the calculations for any known-unknown combinations of the 6 parameters. http://www.cfd-online.com/Forums/ope...alculator.html rajann_786, v199ah, ordinary and 2 others like this.

 August 20, 2012, 07:43 #3 New Member   Ayushi Join Date: Jul 2012 Posts: 4 Rep Power: 14 Can you explain it in more detail

 October 14, 2015, 06:37 #4 New Member   Rajendra Singh Join Date: Aug 2015 Posts: 16 Rep Power: 11 Thanks to 'la7low'

 January 23, 2020, 07:24 #5 New Member   Eneko Join Date: Jan 2020 Posts: 1 Rep Power: 0 Hi This doesn't work at least in 2019 R2 version. Does anyone know how to calculate it properly? Thank you

October 22, 2020, 11:25
#6
New Member

Jatinder Goyal
Join Date: Jan 2019
Location: Delft
Posts: 1
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@eansgo, the formulas given above work just fine for 2019 R3 version. I have implemented them in a matlab file. That might be helpful for people in the future.
Attached Files
 BiasFactor.zip (826 Bytes, 97 views)

 December 19, 2021, 06:49 #7 New Member   Erfan Didari Join Date: Dec 2021 Posts: 1 Rep Power: 0 Thanks. This work of yours helped a lot.

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