{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Turbulence lecture 30

# Turbulence lecture 30 - Turbulence Lecture 30 Turbulent...

This preview shows pages 1–4. Sign up to view the full content.

Turbulence Lecture 30 Turbulent Boundary Layers Basic Problem : Unsteady or steady – incompressible. a. External flows – to predict lift and drag characteristics. b. Internal flows – to predict pressure losses, and flow velocity profile uniformity. For both a and b, the prediction of the onset of flow separation is of interest (Also flow reattachment) External Flow : Internal Flow : 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
a. Time averaged profile. (steady flow) b. Instantaneous profile. Note 0 w = for this case but because turb is 3D 0 w ′ ≠ Basic Reynolds Avg. equations apply. Continuity : () 0 if 0 UV xy UUx V ∂∂ += =⇒ Diverging streamlines – static P goes up. 3 equations, 6 unknowns U, V, P 22 u, u , vv x y ′′ Basic Method of Solution. 2
Apply B.L. approximation to 2 P.D.E.s in terms of 3 unknowns ,, uv UV ′ ′ , and then integrate the equations across the B.L ( y -dir.) to convert to one O.D.E. (x-mo) in terms of 3 unknowns. () () () 12 , f Cx xH x θ / \ momentum shape factor thickness with auxiliary equations.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 5

Turbulence lecture 30 - Turbulence Lecture 30 Turbulent...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online