For a square plan building on an exposed site with the wind blowing directly on to the face of the building the wind pressure coefficients are as shown in Fig 8.
12.
For a case of an incompressible but viscous fluid, this represents the " profile " pressure coefficient, sinceitis associated to the pressure hydrodynamic forces rather than to the viscous ones.
13.
Where u is the flow speed at the point at which pressure coefficient is being evaluated, and Ma is the Mach number : the flow speed is negligible in comparison with the sound speed.
14.
The maximum stable value of K is called the passive earth pressure coefficient, K p; the passive earth pressure would develop, for example against a vertical plow that is pushing soil horizontally.
15.
The minimum stable value of K is called the active earth pressure coefficient, K a; the active earth pressure is obtained, for example, when a retaining wall moves away from the soil.
16.
In the fluid flow field around a body there will be points having positive pressure coefficients up to one, and negative pressure coefficients including coefficients less than minus one, but nowhere will the coefficient exceed plus one because the highest pressure that can be achieved is the stagnation pressure.
17.
In the fluid flow field around a body there will be points having positive pressure coefficients up to one, and negative pressure coefficients including coefficients less than minus one, but nowhere will the coefficient exceed plus one because the highest pressure that can be achieved is the stagnation pressure.
18.
Consequently an engineering model can be tested in a wind tunnel or water tunnel, pressure coefficients can be determined at critical locations around the model, and these pressure coefficients can be used with confidence to predict the fluid pressure at those critical locations around a full-size aircraft or boat.
19.
Consequently an engineering model can be tested in a wind tunnel or water tunnel, pressure coefficients can be determined at critical locations around the model, and these pressure coefficients can be used with confidence to predict the fluid pressure at those critical locations around a full-size aircraft or boat.
20.
:You may be able to get an approximation ( e . g . water will flow through a hole at a rate determined by pressure based on its pressure coefficient ) but in the case of water lines, you don't have any way to account for friction or restrictions upstream.
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