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January 29, 2016, 09:22 |
Law of the wall with pressure gradient
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#1 |
New Member
Tim
Join Date: May 2014
Posts: 8
Rep Power: 12 |
Hi,
I know the Law of the wall in turbulent flows (i.e. at flat plate). Is this also valid in decelerated turbulent flows with positive pressure gradient and without separation? Cheers, Schwimmy |
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January 29, 2016, 11:54 |
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#2 |
Senior Member
david
Join Date: Oct 2012
Posts: 142
Rep Power: 14 |
the law of the wall is based on a constant shear stress under the local equilibrium balance between production of turbulent kinetic energy and its dissipation rate. under adverse pressure gradient conditions, this is no longer valid and some modifications need to be made. this is why the k-epsilon with the standard wall function fails in such flows.
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January 29, 2016, 12:17 |
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#3 |
New Member
Sushma
Join Date: Jan 2016
Posts: 11
Rep Power: 10 |
in this you can apply renyold stress model but it can increase your computation cost
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Tags |
boundary layer flow, law of the wall |
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