Some numerical studies of surface boundary-layer flow above gentle topography

1977 ◽  
Vol 11 (4) ◽  
pp. 439-465 ◽  
Author(s):  
P. A. Taylor
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Flow ◽  
Surface Boundary ◽  
Surface Boundary Layer ◽  
Numerical Studies ◽  
Layer Flow

scholarly journals A Non-Linear Mixed Spectral Finite-Difference 3-D model for planetary boundary-layer flow over complex terrain

2011 ◽  
Vol 6 (1) ◽  
pp. 75-78 ◽  
Author(s):  
W. Weng ◽  
P. A. Taylor
Keyword(s):  
Boundary Layer ◽  
Finite Difference ◽  
Planetary Boundary Layer ◽  
Boundary Layer Flow ◽  
Complex Terrain ◽  
Surface Boundary ◽  
Surface Boundary Layer ◽  
Non Linear ◽  
Flow Over Topography ◽  
Layer Flow

Abstract. The Non-Linear Mixed Spectral Finite-Difference (NLMSFD) model for surface boundary-layer flow over complex terrain has been extended to planetary boundary-layer flow over topography. Comparisons are made between this new version and the surface layer model. The model is also applied to simulate an Askervein experimental case. The results are discussed and compared with the observed field data.

Free-surface Boundary-layer Flow on a Curved Bed

1986 ◽  
Vol 36 (1) ◽  
pp. 101-116 ◽  
Author(s):  
P. M. EAGLES ◽  
P. G. DANIELS
Keyword(s):  
Boundary Layer ◽  
Free Surface ◽  
Boundary Layer Flow ◽  
Surface Boundary ◽  
Surface Boundary Layer ◽  
Layer Flow

scholarly journals Effects Of Variable Viscousity On Boundary Layer Flow With Convective Surface Boundary Condition

2014 ◽  
Vol 6 (4) ◽  
pp. 35-38
Author(s):  
Disu Akeem B ◽  
◽  
Olorunnishola Toyin ◽  
Ishola Christie Y
Keyword(s):  
Boundary Layer ◽  
Boundary Condition ◽  
Boundary Layer Flow ◽  
Surface Boundary ◽  
Surface Boundary Condition ◽  
Layer Flow

The spreading of insoluble surfactant at the free surface of a deep fluid layer

1995 ◽  
Vol 293 ◽  
pp. 349-378 ◽  
Author(s):  
O. E. Jensen
Keyword(s):  
Boundary Layer ◽  
Free Surface ◽  
Boundary Layer Flow ◽  
Fluid Layer ◽  
Active Material ◽  
Lower Boundary ◽  
Leading Edge ◽  
Surface Contamination ◽  
Surface Boundary ◽  
Layer Flow

The unsteady spreading of an insoluble monolayer containing a fixed mass of surface-active material over the initially horizontal free surface of a viscous fluid layer is investigated. A flow driving the spreading is induced by gradients in surface tension, which arise from the nonuniform surfactant distribution. Distinct phases in the flow's dynamics are distinguished by a time T = H02/v, where H0 is the fluid depth and v its viscosity. For times t [Lt ] T, i.e. before the lower boundary has any significant influence on the flow, a laminar sub-surface boundary-layer flow is generated. The effects of gravity, capillarity, surface diffusion or surface contamination may be weak enough for the flow to drive a substantial unsteady displacement of the free surface, upward behind the monolayer's leading edge and downward towards its centre. Similarity solutions are identified describing the spreading of a localized planar monolayer strip (which spreads like t1/2) or an axisymmetric drop (which spreads like t3/8); using the Prandtl transformation, the associated boundary-layer problems are solved numerically. Quasi-steady sub-layers are shown to exist at the centre and at the leading edge of the monolayer; that due to surface contamination, for example, may eventually grow to dominate the flow, in which case spreading proceeds like t3/4. Once t = O(T), vorticity created at the free surface has diffused down to the lower boundary and the flow changes character, slowing appreciably. The dynamics of this stage are modelled by reducing the problem to a single nonlinear diffusion equation. For a spreading monolayer strip or drop, the transition from an inertia-dominated (boundary-layer) flow to a viscosity-dominated (thin-film) flow is predicted to be largely complete once t ≈ 85 T.

Boundary Layer Measurement on the Blade Surface of a Multi-Stage Axial Flow Compressor

2003 ◽  
Author(s):  
Y. H. Shin ◽  
R. L. Elder ◽  
I. Bennett
Keyword(s):  
Boundary Layer ◽  
Boundary Layer Flow ◽  
Axial Flow ◽  
Velocity Profiles ◽  
Surface Boundary ◽  
Blade Surface ◽  
Suction Surface ◽  
Axial Flow Compressor ◽  
Layer Flow ◽  
Flow Compressor

This study presents experimental investigations into blade suction surface boundary layer flow in a multistage axial flow compressor. The experiments were focused on the third stage of the 4-stage Low Speed Research Compressor (LSRC) at Cranfield University. Measurements within the boundary layer were obtained using a hot wire probe. This was traversed normal to the blade surface at small increments, capturing the unsteady velocity profile within the boundary layer. Detailed boundary layer flow measurements covering most of the stator suction surface were taken and are described using time mean and ensemble averaged velocity profiles. Turbulence intensity in the boundary layer flow on the blade suction surface is also discussed. A strong wake-induced strip zone due to passing wake disturbances are generated at midspan near the blade leading edge at rotor blade passing frequency. Corner separation was observed at the tip region near the trailing edge. Normalized velocity profiles in this region show no variation in time.

Sign in / Sign up

Export Citation Format

Share Document