ESDU 81017
Mean forces, pressures, and moments for circular cylindrical structures: finitelength cylinders in uniform and shear flow.
Abstract:
ESDU 81017 provides data for estimating the mean forces, pressures and moments induced by flow around a finitelength cylindrical structure of circular section. Data are presented in ESDU 80025 for twodimensional flow conditions when the effects of flow around the free end (or ends) can be ignored, as with very long cylinders. The data in ESDU 81017 are in the form of correction factors to the twodimensional values to account for (i) the effect of the free end (or ends) and (ii) the effect of shear flow. The main effects of Reynolds number, surface roughness and flow turbulence are included through the use of ESDU 80025. Simplified calculation sheets allow the application of the basic data to tapered structures and to structures with step changes in cylinder diameter. A method is also provided to allow the method of estimating the twodimensional pressure distribution and flow field velocities in ESDU 80025 to be extended to finitelength cylinders in uniform or shear flow. The principal applications for the data lie in calculating the mean wind loading acting on groundbased structures such as stacks, towers, silos, storage tanks and chemical processing equipment.Indexed under:
 Base Pressure
 Bluff Bodies
 Centre of Pressure
 Internal Pressure
 Overturning Moment on SurfaceMounted Structures
 Pressure Distribution
 Profile Drag
 Roughness
 Shear Flow
 Sideforce
 Velocity Profile
 Wind Speed
Details:
Data Item ESDU 81017  

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This Data Item contains 18 interactive graph(s) as listed below.
Graph  Title 

Figure 1a  Part 1  Factor giving effect of H/D on overall drag coefficient for uniform flow 
Figure 1a  Part 2  Factor giving effect of H/D on overall drag coefficient for uniform flow 
Figure 1b  Factor giving effect of H/D on overall drag coefficient for uniform flow 
Figure 1c  Factor giving effect of H/D on overall drag coefficient for uniform flow 
Figure 2  Factor f_{s} to account for shear flow effect on overall drag coefficient for parallelsided cylinders 
Figure 3a  Factor giving local drag coefficients in uniform flow at subcritical Re(Re_{e} < 4 × 10^{5}) 
Figure 3b  Factor giving local drag coefficients in uniform flow at subcritical Re(Re_{e} < 4 × 10^{5}) 
Figure 3c  Factor giving local drag coefficients in uniform flow at subcritical Re(Re_{e} < 4 × 10^{5}) 
Figure 4a  Part 1  Factors giving local drag coefficients in uniform flow, top open, Re_{e} > 1 × 10^{6} 
Figure 4a  Part 2  Factors giving local drag coefficients in uniform flow, top open, Re_{e} > 1 × 10^{6} 
Figure 4a  Part 3  Factors giving local drag coefficients in uniform flow, top open, Re_{e} > 1 × 10^{6} 
Figure 4b  Part 1  Factors giving local drag coefficients in uniform flow, top closed, Re_{e} > 1 × 10^{6} 
Figure 4b  Part 2  Factors giving local drag coefficients in uniform flow, top closed, Re_{e} > 1 × 10^{6} 
Figure 5  Factor f_{sz} giving effect of shear flow on local drag coefficient 
Figure 6a  Centre of pressure position for parallelsided cylinder in uniform flow and in shear flow 
Figure 6b  Centre of pressure position for parallelsided cylinder in uniform flow and in shear flow 
Figure 7  Effect of taper on D_{Du} for slender straighttapered cylinders 
Figure 8  Centre of pressure position for straighttapered cylinders 