ESDU 81017
Mean forces, pressures, and moments for circular cylindrical structures: finite-length cylinders in uniform and shear flow.
Abstract:
ESDU 81017 provides data for estimating the mean forces, pressures and moments induced by flow around a finite-length cylindrical structure of circular section. Data are presented in ESDU 80025 for two-dimensional 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 two-dimensional 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 two-dimensional pressure distribution and flow field velocities in ESDU 80025 to be extended to finite-length cylinders in uniform or shear flow. The principal applications for the data lie in calculating the mean wind loading acting on ground-based 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 Surface-Mounted Structures
- Pressure Distribution
- Profile Drag
- Roughness
- Shear Flow
- Sideforce
- Velocity Profile
- Wind Speed
Details:
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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 fs to account for shear flow effect on overall drag coefficient for parallel-sided cylinders |
| Figure 3a | Factor giving local drag coefficients in uniform flow at subcritical Re(Ree < 4 × 105) |
| Figure 3b | Factor giving local drag coefficients in uniform flow at subcritical Re(Ree < 4 × 105) |
| Figure 3c | Factor giving local drag coefficients in uniform flow at subcritical Re(Ree < 4 × 105) |
| Figure 4a - Part 1 | Factors giving local drag coefficients in uniform flow, top open, Ree > 1 × 106 |
| Figure 4a - Part 2 | Factors giving local drag coefficients in uniform flow, top open, Ree > 1 × 106 |
| Figure 4a - Part 3 | Factors giving local drag coefficients in uniform flow, top open, Ree > 1 × 106 |
| Figure 4b - Part 1 | Factors giving local drag coefficients in uniform flow, top closed, Ree > 1 × 106 |
| Figure 4b - Part 2 | Factors giving local drag coefficients in uniform flow, top closed, Ree > 1 × 106 |
| Figure 5 | Factor fsz giving effect of shear flow on local drag coefficient |
| Figure 6a | Centre of pressure position for parallel-sided cylinder in uniform flow and in shear flow |
| Figure 6b | Centre of pressure position for parallel-sided cylinder in uniform flow and in shear flow |
| Figure 7 | Effect of taper on DDu for slender straight-tapered cylinders |
| Figure 8 | Centre of pressure position for straight-tapered cylinders |