# Difference between laminar and turbulent separatio

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 September 20, 2007, 07:43 Difference between laminar and turbulent separatio #1 NIK Guest   Posts: n/a What is the difference between laminar (LS) and turbulent separation (TS) for a flow over circular cylinder?

 September 20, 2007, 09:00 Re: Difference between laminar and turbulent separ #2 gocarts Guest   Posts: n/a If it's any help try Dimples on Golf Balls for an explanation of laminar and turbulent boundary layer separation over a sphere - I think you'll find the reasoning similar to the flow over a cylinder.

 September 20, 2007, 12:50 Re: Difference between laminar and turbulent separ #3 Gerrit Groot Guest   Posts: n/a What difference do you want to know about? The turbulent one will have a smaller wake, this is why skaters use strips on their arms (streamlined shapes like cycling helmets are not allowed for them).

 September 21, 2007, 05:06 Re: Difference between laminar and turbulent separ #4 NIK Guest   Posts: n/a Thanks. In one paper by Trevin et. al, he talks about LS (laminar separation) and TS (turbulent separation) at Re=140000. How can we get laminar or turbulent separation using the same code?

 September 21, 2007, 05:25 Re: Difference between laminar and turbulent separ #5 Gerrit Groot Guest   Posts: n/a First of all, I suppose your code is 2D. Does it have a transition model?

 September 21, 2007, 07:28 Re: Difference between laminar and turbulent separ #6 NIK Guest   Posts: n/a My code is 3D DES using S-A turbulence model.

 September 21, 2007, 07:41 Re: Difference between laminar and turbulent separ #7 Gerrit Groot Guest   Posts: n/a Ooh, isn't that a bit heavy for cylinder flow? Why don't you use a 2D solver? You run in fully turbulent then I suppose? Anyway, if you only want to see the difference in the wake for engineering purposes, I think it's tabulated somewhere, maybe in the drag book by Hoerner.

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