what is the Typical cell size?

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 February 24, 2009, 22:12 what is the Typical cell size? #1 mike Guest   Posts: n/a am trying to run unsteady case, and in order to do that I need to estimate (delta t) delta t= Typical cell size/characteristic flow velocity (this eqution from fluent.com) can any body help in this thanks

 February 25, 2009, 15:05 Re: what is the Typical cell size? #2 orca Guest   Posts: n/a In 3d you could use cube root of volume/#_of_cells. Just an estimate. HTH

 February 25, 2009, 16:14 Re: what is the Typical cell size? #3 Ralf Schmidt Guest   Posts: n/a Hi! i would use the finest grid cell for calculation. So you can be sure that flow is resolved everywhere Best whises Ralf

 December 7, 2016, 09:31 #4 Senior Member   Onur Özcan Join Date: Feb 2016 Location: Istanbul/Turkey Posts: 393 Rep Power: 3 which one is preferred to be used? both approximations are applicable.

December 7, 2016, 11:05
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 Originally Posted by oozcan which one is preferred to be used? both approximations are applicable.
In usual cases it is recommended dt = L / 3V. L - characteristic length, V - characteristic velocity. L = cell characteristic size may be very restrictive, but also safe in terms of convergence.

If your mesh is relatively uniform, then you may estimate cell size as cubic root of Domain Volume / Number of Cells. Anyway it is safe to use minimum cell size.

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