ESDU 80025 PDF

Embed Size px x x x x Data Items provide validated information in engineering design and analysis for use by, or under the supervisionof, professionally qualified engineers. The data are founded on an evaluation of all the relevant information, bothpublished and unpublished, and are invariably supported by original work of ESDU staff engineers or consultants. The whole process is subject to independent review for which crucial support is provided by industrial companies,government research laboratories, universities and others from around the world through the participation of someof their leading experts on ESDU Technical Committees.

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The Data Item document you have requested is available only to subscribers or purchasers. ESDU Mean forces, pressures and flow field velocities for circular cylindrical structures: single cylinder with two-dimensional flow. Summary Document. Abstract: ESDU 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.

ESDU 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. Subscribers login here. Become a Subscriber. Explore the A-Z Index. All Rights Reserved.

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ESDU 80025

The Data Item document you have requested is available only to subscribers or purchasers. ESDU Mean forces, pressures and flow field velocities for circular cylindrical structures: single cylinder with two-dimensional flow. Summary Document. Abstract: ESDU 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. ESDU 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.

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Line types: Drag & lift data

OrcaFlex also offers a choice, on the line data form, of formulation of the way in which drag force components vary with the incidence angle. If wake interference effects are being modelled for a given line, then these normal drag coefficients represent the undisturbed drag coefficients: the drag force will be calculated based on a drag coefficient modified according to the wake model used. Full details of the drag calculation are given in the line theory section. For very smooth cylinders the drag coefficient falls rapidly to 0. For rough cylinders the effect is less marked, but remains significant. In view of this behaviour, the use of variable data for normal drag coefficients is strongly recommended. OrcaFlex will then use the value of drag appropriate to the instantaneous local value of Reynolds number throughout the simulation.

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