First-Order Slip Effects on the Compressible Laminar Boundary Layer Over a Slender Body of Revolution in Axial Flow

1961 ◽  
Vol 28 (6) ◽  
pp. 508-510 ◽  
Author(s):  
S. F. Shen ◽  
J. M. Solomon
Keyword(s):  
Boundary Layer ◽  
Laminar Boundary Layer ◽  
Axial Flow ◽  
Slender Body ◽  
Body Of Revolution ◽  
First Order ◽  
Slip Effects ◽  
Slender Body Of Revolution

BUOYANCY EFFECTS ON UNSTEADY LAMINAR AND ROTATIONALLY SYMMETRICAL BOUNDARY LAYER

1999 ◽  
Vol 23 (3-4) ◽  
pp. 397-408 ◽  
Author(s):  
A. Öztürk ◽  
M.C. Ece
Keyword(s):  
Boundary Layer ◽  
Velocity Field ◽  
Mixed Convection ◽  
Laminar Boundary Layer ◽  
Boundary Layer Flow ◽  
Buoyancy Force ◽  
Body Of Revolution ◽  
First Order ◽  
In Series ◽  
Layer Flow

Initiai development of the laminar boundary-layer flow over an impulsively started translating and spinning isothermal body of revolution in the case of mixed convection is investigated. Velocity components and temperature are expanded in series in powers of time. Leading and first order functions are obtained analytically and second order functions are determined numerically. The general results are applied to a sphere to investigate the effects of density variations on velocity field and on the onset of separation. The buoyancy force is more effective for small rotational speeds and facilitates the onset of separation for opposing flow and retards it for aiding flow.

Dynamic Analysis of a Slender Body of Revolution Berthing to a Wall

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Q. X. Wang ◽  
S. K. Tan
Keyword(s):  
Practical Importance ◽  
Lateral Force ◽  
The Body ◽  
Slender Body ◽  
Body Of Revolution ◽  
Dynamic Features ◽  
Slender Body Theory ◽  
Quay Wall ◽  
Angle Of Yaw ◽  
Slender Body Of Revolution

A slender body of revolution berthing to a wall is studied by extending the classical slender body theory. This topic is of practical importance for a ship berthing to a quay wall. The flow problem is solved analytically using the method of matched asymptotic expansions. The lateral force and yaw moment on the body are obtained in a closed form too. The translation and yawing of the body are modeled using the second Newton law and coupled with the flow induced. Numerical analyses are performed for the dynamic lateral translation and yawing of a slender spheroid, while its horizontal translation parallel to the wall is prescribed at zero speed, constant speed, and time varying speed, respectively. The analysis reveals the interesting dynamic features of the translation and yawing of the body in terms of the forward speed and starting angle of yaw of the body.

Experimental investigations of the asymmetric vortex formation over a slender body of revolution at high angles of attack

2020 ◽  
Vol 34 (14n16) ◽  
pp. 2040089
Author(s):  
Yiding Zhu
Keyword(s):  
Vortex Formation ◽  
The Body ◽  
Slender Body ◽  
Experimental Investigations ◽  
Initial Growth ◽  
Body Of Revolution ◽  
Momentum Exchange ◽  
Time Resolved ◽  
High Angles Of Attack ◽  
Slender Body Of Revolution

This paper describes an experimental investigation of the initial growth of flow asymmetries over a slender body of revolution at high angles of attack with natural and disturbed noses. Time-resolved particle image velocimetry (PIV) is used to investigate the flow field around the body. Flow visualization clearly shows the formation of the asymmetric vortices. Instantaneous PIV shows that the amplified asymmetric disturbances lead to Kelvin–Helmholtz instability appearing first on one side, which increases the momentum exchange crossing the layer. As a result, the separation region shrinks which creates the initial vortex asymmetry.

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