ESDU 71016

Fluid forces, pressures and moments on rectangular blocks.

Abstract:

ESDU 71016 provides mean (time-averaged) force, pressure and moment coefficients for use in the estimation of forces, pressures and moments on single rectangular-sectioned blocks or prisms as a result of fluid flow past them. The basic information on force and moment coefficients is presented for solid or impermeable blocks with sharp edges in an unbounded, smooth, uniform, low-speed flow for Reynolds numbers greater than 1000. Corrections for edge rounding, turbulence and lower Reynolds numbers are given. Average and local pressure coefficients for a number of block shapes are given and an estimation procedure for determination of pressure distributions on surface-mounted blocks of any rectangular shape is provided. Interior pressures in permeable blocks are discussed.

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Details:

Data Item ESDU 71016
Format:	PDF with interactive graphs
Status:	Amendment (C), 01 Nov 1978 Published in Release 2000-03 (init)
Previous Releases:	None available
ISBN:	978 1 86246 372 1

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This Data Item contains 33 interactive graph(s) as listed below.

Graph	Title
Figure 1a	Effect of streamwise depth on C_X for isolated blocks in datum conditions
Figure 1b	Effect of streamwise depth on C_X for isolated blocks in datum conditions
Figure 2	Effect of free-stream inclination on C_X for isolated square-sectioned blocks in datum conditions
Figure 3	Effect of free-stream inclination on C_Y for isolated square-sectioned blocks in datum conditions
Figure 4	Effect of free-stream inclination on C_D for isolated square-sectioned blocks in datum conditions
Figure 5	Effect of free-stream inclination on C_C for isolated square-sectioned blocks in datum conditions
Figure 6a	Effect of streamwise depth on C_X for surface-mounted rectangular blocks in datum conditions
Figure 6b	Effect of streamwise depth on C_X for surface-mounted rectangular blocks in datum conditions
Figure 7	Effect of free-stream inclination on C_X for surface-mounted square-sectioned blocks in datum conditions
Figure 8	Effect of free-stream inclination on C_Y for surface-mounted square-sectioned blocks in datum conditions
Figure 9	Effect of free-stream inclination on C_Z for surface-mounted square-sectioned blocks in datum conditions (tentative)
Figure 10	Effect of free-stream inclination on C_Z^* for surface-mounted square-sectioned blocks in datum conditions (tentative)
Figure 11	Effect of free-stream inclination on C_D for surface-mounted square-sectioned blocks in datum conditions
Figure 12	Effect of free-stream inclination on C_C for surface-mounted square-sectioned blocks in datum conditions
Figure 13a	Tentative data for centre-of-pressure position for surface-mounted rectangular blocks with free-stream normal to one face (see Section 3.4)
Figure 13b	Tentative data for centre-of-pressure position for surface-mounted rectangular blocks with free-stream normal to one face (see Section 3.4)
Figure 14	Correction factor to C_X for effect of low Reynolds number (see Section 4.1)
Figure 15	Blockage correction factor (see Section 4.2)
Figure 16a	Tentative correction factor for effect of turbulence intesity (see Section 4.3)
Figure 16b	Tentative correction factor for effect of turbulence scale (see Section 4.3)
Figure 17b	Critical Reynolds number region for rectangular blocks with rounded edges (see Section 4.7)
Figure 17c	Correction factor for effect of rounded edges in supercritical flow (see Section 4.7)
Figure 17d	Correction factor for effect of rounded edges, square section at Φ = 45 ° (see Section 4.7)
Figure 18a	Approximate effect of incidence on correction factors k₅ and k₆, square section in two-dimensional flow (see Section 4.7) - k₅, Subcritical flow
Figure 18b	Approximate effect of incidence on correction factors k₅ and k₆, square section in two-dimensional flow (see Section 4.7) - k₅, Supercritical flow
Figure 18c	Approximate effect of incidence on correction factors k₅ and k₆, square section in two-dimensional flow (see Section 4.7) - k₆, Subcritical flow
Figure 18d	Approximate effect of incidence on correction factors k₅ and k₆, square section in two-dimensional flow (see Section 4.7) - k₆, Supercritical flow
Figure 19	Average pressure coefficients on rectangular blocks in datum conditions, two-dimensional flow normal to face A
Figure 20	Average pressure coefficients on square-sectioned blocks in datum conditions, two-dimensional flow
Figure 21	Average pressure coefficients on isolated square-sectioned blocks with c/b = 5 in datum conditions
Figure 22	Average pressure coefficients on isolated square-sectioned blocks with c/b = 1 in datum conditions
Figure 23	Average pressure coefficients on surface-mounted square-sectioned blocks with c/b = 5 in datum conditions
Figure 24	Average pressure coefficients on surface-mounted square-sectioned blocks with c/b = 1 in datum conditions