ENG$313-$ENG$704$ Assignment $1$

Question $1$

Consider the wind acting on the sign and pole shown below. The wind

velocity is $40\frac{m}{s}$ and is in a direction $90$ degrees to the front face of the

sign. The sign is a thin plate, has a diameter of $800$ mm $,$ and is attached

to the ground by $50$ mm pole. The distance from ground to the bottom

of the sign is $1\mathrm{.}5$ m $.$ Air density $=1\mathrm{.}2k\frac{g}{m^3}$ and dynamic viscosity $$

$=1\mathrm{.}8{10}^{-5}Pa*s.$

Figure $1$: Wind acting on sign

a Classify the flow around the sign.

b Determine the drag force acting on the pipe and sign.

c Estimate the maximum bending moment in the pipe

$($neglect self$-$weight$).$