9.21 A smooth, flat plate of length = 6 m and width b = 4 mis placed in water with an upstream velocity of U= 0.5 m/s.Determine the boundary layer thickness and the wall shear stressat the center and the trailing edge of the plate. Assume a laminarboundary layer.9.22 An atmospheric boundary layer is formed when the windblows over the earth's surface. Typically, such velocity profilescan be written as a power law: u=ay, where the constants a andn depend on the roughness of the terrain. As is indicated in Fig.P9.22, typical values are n = 0.40 for urban areas, n = 0.28 forwoodland or suburban areas, and n = 0.16 for flat open country(Ref. 23). (a) If the velocity is 20 ft/s at the bottom of the sail onyour boat (y= 4 ft), what is the velocity at the top of the mast(y 30 ft)? (b) If the average velocity is 10 mph on the tenth4500.28E 300150FIGURE P9.22

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smooth, flat plate of length and wid is placed in water with an upstream velocity of U Determine the boundary layer thickness and the wall at the center and the trailing edge of the plate. Assum boundary layer.

smooth, flat plate of length and wid is placed in water with an upstream velocity of U Determine the boundary layer thickness and the wall at the center and the trailing edge of the plate. Assum boundary layer.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Calculation of Settlement

The vertical displacement of the structural foundation due to the loading from the superstructure is known as settlement. It is due to the reduction of air voids present in the soil. The amount of vertical displacement depends on the bearing capacity of the soil on which the foundation is laid. The effect of the settlement depends on the magnitude of settlement, uniformity, and the structural design of the structure. The maximum allowable settlement for residential and office buildings should be less than 18 mm, for industrial buildings, it is 38 mm and for commercial buildings, it is 25 mm.

Question

9.21 A smooth, flat plate of length = 6 m and width b = 4 m
is placed in water with an upstream velocity of U= 0.5 m/s.
Determine the boundary layer thickness and the wall shear stress
at the center and the trailing edge of the plate. Assume a laminar
boundary layer.
9.22 An atmospheric boundary layer is formed when the wind
blows over the earth's surface. Typically, such velocity profiles
can be written as a power law: u=ay, where the constants a and
n depend on the roughness of the terrain. As is indicated in Fig.
P9.22, typical values are n = 0.40 for urban areas, n = 0.28 for
woodland or suburban areas, and n = 0.16 for flat open country
(Ref. 23). (a) If the velocity is 20 ft/s at the bottom of the sail on
your boat (y= 4 ft), what is the velocity at the top of the mast
(y 30 ft)? (b) If the average velocity is 10 mph on the tenth
450
0.28
E 300
150
FIGURE P9.22

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