# report on Civil engineering project

REPORT WRITING AND DISCUSSION

marising all groups results for preparing your report. Study the summary spreadsheet and

nd out how it was created. If you feel con dent, you can develop a similar spreadsheet

of you own.

2. Include the graph of Cp versus to your report. Compare this graph with the standard

results on Figure 3. Comment on the shape of the graph and on di erences between you

results and standard results.

3. Using the data from the summary spreadsheets calculate the drag coecient using equation

(5) and the drag per 1m span of the cylinder by equation (3) for two cylinder diameters.

A method of numerical integration using spreadsheets is discussed in Appendix 2. You

can use the template provided in the \Integration template" worksheet.

4. Plot (i) drag D as a function of free-stream velocity U1 for two cylinder diameters on

one plot and (ii) drag coecient CD as a function of Reynolds number for two cylinder

diameters on another plot. Compare the graphs and discuss which of them is more useful

for practical applications.

5. Compare the observed values of the drag coecient with the standard results presented

on Figure 2. Comment on di erences between the measured and standard results. Is the

drag due to shear stresses important for the studied range of Reynolds numbers? Discuss

the variations of measured drag coecients with Reynolds number.

6. Include the graph of the wake velocity pro le in your report. Comment on the shape of

the graph. Why is the velocity in the wake lower then the free-stream velocity? Why is

the uniform velocity outside the wake higher than the free-stream velocity?

7. Give a general discussion of your results. Discuss the physics of drag generation. Why

is the representation of drag in the non-dimensional form of drag coecient important?

What is the role of experiments in obtaining universal relations of drag coecients to

Reynolds number? What is the practical importance of such relations?

8. Apply the results of your experiment to the following practical problem:

A radio mast has a 5m long cylindrical section [url removed, login to view] in diameter. Find the wind speed

when the results of your experiment can be used for calculating wind load on the mast.

Calculate the total load on the section at this speed assuming a uniform wind pro le.

9. Make general conclusions to your report.

9

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