MECH2002: Fluid Mechanics - Engineering Assignment Help

Assignment Task:

Fluid Mechanics MECH2002

1- Design Water Network Supply A consulting engineering firm has received a request from a client to supply water to the construction site at Sydney International airport via a pipeline that will be installed near the ground surface. The design uses the ground profile that shows the reduced level (RL) measured form sea level versus chainage or distance (CH). The RL is taken using Google Earth Pro and varies between reservoir and the construction site dam which are distanced apart by 22.8 km as The junctions are labelled from J1 to J37. All the given elevations are relative to the sea surface. While the base of the reservoir (R1) is RL83m, its top water level (TWL) is at RL115m and hence H=32m. The dam (R2) surface level is set at RL56m. The pipeline includes steel pipes with an outside diameter of 500mm and wall thickness of t. To compute t, you should use half of the last two-digit number of your student ID - e.g. a student number ending to 26 will equate a 13mm thickness. According to Australian Standard Design Charts for Water Supply and Sewerage (AS2200), the roughness for steel is in a range of 0.01 mm-0.06 mm. The lower value in the range represents the expected value for clean, new pipes while the higher value in the range applies to the used pipes. Students with odd student ID numbers should consider new pipes while students with even student ID numbers must consider used pipes in their design. The system involves a number of valves and fitting between each segment. These fitting and valves cause minor losses. You require to compute the total K factor for each segment. Two design options are available:

(i) gravity system and

(ii) pressurised system.

The gravity system uses the elevation to achieve the design requirements while the pressurised system uses a pump to meet the design requirements. For both design options, you require to obtain pipes’ length and elevation. For this purpose, you can use WebPlotDigitizer to extract RL and CH for junction J1 to J37. The pipe length for each segment can be then obtained

1 2. Part A: Determine the feasibility of conveying water via a gravity system pipeline (50 marks):

1. Considering reservoir TWL is at RL115m, model the arrangement in EPANET. A snapshot of the model should be presented in the report (5 marks). A table showing the CH, RL and for junctions and length for segments should be also presented (5 marks).

2. Determine the flow rate delivered at the dam in MLD (Mega-litter per day) (5 marks).

3. Plot the hydraulic grade line (HGL) between the reservoir and the dam (10 marks). For this purpose, you should collect the total head at each node and plot it versus CH. Show the ground profile on the same plot. The axes must have labels with proper units.

4. A hand calculation for the variation of the total head from the reservoir to J3 should be presented. Compare the hand calculation with the model output and discuss the results (10 marks).

5. Evaluate whether the energy line intersects with the ground profile at any point. This evaluation allows determining if the gravity system pipeline will work. Support your answer by proper discussion (5 marks)

6. Find minimum reservoir TWL to ensure HGL remain at least 2m above the highest ground surface profile elevation, you must plot HGL and ground profile for the new TWL (10 marks).

Part B: Consider there is a tunnel between nodes J20 and J22 to avoid high pick of J21. For these conditions, design a pressurised system by introducing a pump while the reservoir TWL is RL83m to achieve the best efficiency performance. 

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