ESDU 71016
Fluid forces, pressures and moments on rectangular blocks.
Abstract:
ESDU 71016 provides mean (timeaveraged) force, pressure and moment coefficients for use in the estimation of forces, pressures and moments on single rectangularsectioned 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, lowspeed 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 surfacemounted blocks of any rectangular shape is provided. Interior pressures in permeable blocks are discussed.Indexed under:
 Axial Force
 Base Pressure
 Critical Conditions in Fluid Flow
 Internal Pressure
 Overturning Moment on Surfacemounted Structures
 Pressure Distribution
 Profile Drag
 Roughness
 Sideforce
 Turbulence
 Velocity Profile
 Wind Speed
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Data Item ESDU 71016  

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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 freestream inclination on C_{X} for isolated squaresectioned blocks in datum conditions 
Figure 3  Effect of freestream inclination on C_{Y} for isolated squaresectioned blocks in datum conditions 
Figure 4  Effect of freestream inclination on C_{D} for isolated squaresectioned blocks in datum conditions 
Figure 5  Effect of freestream inclination on C_{C} for isolated squaresectioned blocks in datum conditions 
Figure 6a  Effect of streamwise depth on C_{X} for surfacemounted rectangular blocks in datum conditions 
Figure 6b  Effect of streamwise depth on C_{X} for surfacemounted rectangular blocks in datum conditions 
Figure 7  Effect of freestream inclination on C_{X} for surfacemounted squaresectioned blocks in datum conditions 
Figure 8  Effect of freestream inclination on C_{Y} for surfacemounted squaresectioned blocks in datum conditions 
Figure 9  Effect of freestream inclination on C_{Z} for surfacemounted squaresectioned blocks in datum conditions (tentative) 
Figure 10  Effect of freestream inclination on C_{Z}^{*} for surfacemounted squaresectioned blocks in datum conditions (tentative) 
Figure 11  Effect of freestream inclination on C_{D} for surfacemounted squaresectioned blocks in datum conditions 
Figure 12  Effect of freestream inclination on C_{C} for surfacemounted squaresectioned blocks in datum conditions 
Figure 13a  Tentative data for centreofpressure position for surfacemounted rectangular blocks with freestream normal to one face (see Section 3.4) 
Figure 13b  Tentative data for centreofpressure position for surfacemounted rectangular blocks with freestream 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 k_{5} and k_{6}, square section in twodimensional flow (see Section 4.7)  k_{5}, Subcritical flow 
Figure 18b  Approximate effect of incidence on correction factors k_{5} and k_{6}, square section in twodimensional flow (see Section 4.7)  k_{5}, Supercritical flow 
Figure 18c  Approximate effect of incidence on correction factors k_{5} and k_{6}, square section in twodimensional flow (see Section 4.7)  k_{6}, Subcritical flow 
Figure 18d  Approximate effect of incidence on correction factors k_{5} and k_{6}, square section in twodimensional flow (see Section 4.7)  k_{6}, Supercritical flow 
Figure 19  Average pressure coefficients on rectangular blocks in datum conditions, twodimensional flow normal to face A 
Figure 20  Average pressure coefficients on squaresectioned blocks in datum conditions, twodimensional flow 
Figure 21  Average pressure coefficients on isolated squaresectioned blocks with c/b = 5 in datum conditions 
Figure 22  Average pressure coefficients on isolated squaresectioned blocks with c/b = 1 in datum conditions 
Figure 23  Average pressure coefficients on surfacemounted squaresectioned blocks with c/b = 5 in datum conditions 
Figure 24  Average pressure coefficients on surfacemounted squaresectioned blocks with c/b = 1 in datum conditions 
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