Mean forces, pressures and flow field velocities for circular cylindrical structures: single cylinder with two-dimensional flow.
This Data Item has been Amended in Release 2019-02 (Apr 2019).
Abstract:ESDU 80025 provides data for estimating the mean forces and pressures induced by flow normal or inclined to a cylindrical structure of circular cross-section. The data apply when the effect of the flow around the free end (or ends) can be ignored (i.e. for two-dimensional flow). ESDU 81017 provides additional information in the form of correction factors that can be applied to these data to account for end effects and shear flow effects, such as those associated with cantilever structures in the non-uniform atmospheric wind. Drag coefficients are given as a function of Reynolds number (10E-2 to 10E7), the turbulence properties of the oncoming flow and surface roughness for which guidance is given on typical values. The effects of spanwise protrusions and other nearby plane surfaces are quantified as are the effects of perforations and helical strakes. Data are provided, in equation form, giving both mean and fluctuating surface pressure distributions and the mean velocity flow field for cylinders with a smooth or rough surface at Reynolds numbers between about 10E5 and 10E7. Calculation sheets are provided to summarise the step-by-step estimation procedures.
- Axial Force
- Base Pressure
- Critical Conditions in Fluid Flow
- Normal Force
- Pressure Distribution
- Profile Drag
- Velocity Distribution
|Data Item ESDU 80025|
- Aircraft Noise
- Fatigue - Endurance Data
- Fatigue - Fracture Mechanics
- Fluid Mechanics, Internal Flow
- Fluid Mechanics, Internal Flow (Aerospace)
- Heat Transfer
- Physical Data, Chemical Engineering
- Stress and Strength
- Transonic Aerodynamics
- Vibration and Acoustic Fatigue
- Wind Engineering
Aerospace Materials Data
Additional Engineering References