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HW 9 – Report

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HW 9 – Report

General

Total number of students 23 Number of submitted HW 22 Number of not submitted HW 1 Number of problems 4

Average grade 96.76

Standard deviation of grades 7.08

Individual problem breakdown

Problem P6.22 P6.30 P6.37 P6.38 Average grade 10.00 9.89 9.64 9.62 Standard deviation

of grades 0.00 0.26 0.85 0.86

Grade distribution

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Grade history

Submission history

Comparison with last year

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Comments

• Some students did not identify the direction of the flow considering the sign of the head loss in P6.30. In order for the physics of the problem to be meaningful, the friction loss should be a positive value (zero if the assumption of frictionless flow is applied).

• Few students did not apply the log-law correctly in P6.37. The log-law cannot be applied at the wall (y = 0). The only location in the domain where the velocity is known is y = h/2.

Specifically it is u = V/2 since the flow is purely driven by shear and no pressure/gravity effects are considered.

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