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Forum: Main CFD Forum

January 18, 2013, 08:43

Replies: 17

Why y+ < 1

Views: 5,509

Posted By LuckyTran

But you do not know this velocity in the first...

But you do not know this velocity in the first place. And that is why you cannot compute the y+ and velocity profile. You can only arrive at this velocity by properly accounting for the fluid stress...

Forum: Main CFD Forum

January 18, 2013, 08:14

Replies: 17

Why y+ < 1

Views: 5,509

Posted By LuckyTran

Oh now I see your point. If you know the y+ then...

Oh now I see your point. If you know the y+ then you know what the gradient is. But the problem is you don't know the y+.

It is linear yes but it is an unknown linear gradient. That is because of...

Forum: Main CFD Forum

January 18, 2013, 07:54

Replies: 17

Why y+ < 1

Views: 5,509

Posted By LuckyTran

As you said, the velocity gradients need to be...

As you said, the velocity gradients need to be resolved in order to get the proper shear stress. The shear stress is important for both the laminar (molecular diffusion) component of the shear...

Forum: Main CFD Forum

January 17, 2013, 13:47

Replies: 17

Why y+ < 1

Views: 5,509

Posted By LuckyTran

Your logic is pretty much spot on. y+ ~ 1 is a...

Your logic is pretty much spot on. y+ ~ 1 is a general rule (a very conservative one). You really only need y+<5 to apply the laws in the laminar sublayer. The additional restrictions come from...

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