# [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: 8 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!

 May 15, 2011, 12:11 ohh I got it #2 Member   Join Date: May 2010 Posts: 44 Rep Power: 8 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. BlockMesh grading calculator rajann_786 and v199ah like this.

 August 20, 2012, 07:43 #3 New Member   Ayushi Join Date: Jul 2012 Posts: 4 Rep Power: 6 Can you explain it in more detail

 October 14, 2015, 06:37 #4 New Member   Rajendra Singh Join Date: Aug 2015 Posts: 11 Rep Power: 3 Thanks to 'la7low'

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