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Difference between laminar and turbulent separatio |
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September 20, 2007, 07:43 |
Difference between laminar and turbulent separatio
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#1 |
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What is the difference between laminar (LS) and turbulent separation (TS) for a flow over circular cylinder?
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September 20, 2007, 09:00 |
Re: Difference between laminar and turbulent separ
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#2 |
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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.
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September 20, 2007, 12:50 |
Re: Difference between laminar and turbulent separ
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#3 |
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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). |
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September 21, 2007, 05:06 |
Re: Difference between laminar and turbulent separ
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#4 |
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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?
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September 21, 2007, 05:25 |
Re: Difference between laminar and turbulent separ
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#5 |
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First of all, I suppose your code is 2D.
Does it have a transition model? |
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September 21, 2007, 07:28 |
Re: Difference between laminar and turbulent separ
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#6 |
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My code is 3D DES using S-A turbulence model.
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September 21, 2007, 07:41 |
Re: Difference between laminar and turbulent separ
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#7 |
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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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