Similar to your FEA coursework, you must work in pairs for the CFD coursework and submit one assignment per pair. It is recommended that you choose a student in the same tutorial group as you, but this is by no means mandatory. Once you have agreed with another student that you will work with them, you should access the page for this module in Blackboard, click on Coursework Groups and both Sign Up to the same group. You will have until 10/01/22 to do this. After this date any students that have not enrolled in a group will be randomly allocated another student to work with. It is your responsibility to manage the workload within your pair. Under some circumstances, students will be allowed to work individually, but please first seek authorisation from the module leader, in writing.

 

You are asked to research theory on CFD in pipe flows (laminar and turbulent). You are also asked to revise first year work on pipe flows with friction. 

 

Task 1

Construct a straight pipe flow which will be laminar and compare the CFD predictions for this scenario with those you would expect from classical theory for a fully developed flow i.e. parabolic velocity profile with known entry length and pressure drop per unit length. At the inlet to the pipe, you may assume a uniform velocity profile. You should use this opportunity to investigate the use of more than 1 mesh for the problem to ensure your results are mesh independent. Include images of the mesh in your report and discuss the settings you have used. 

 

Task 2

Construct a straight pipe flow with a nozzle at the outlet. Ensure the flow is turbulentat the inlet to the pipe and calculate the fully developed flow characteristics, from empirical/theoretical results (make sure the pipe is long enough to reach fully developed flow before entering the nozzle). Carry out a CFD simulation and compare your results with those from empirical findings. State the turbulence modelling assumptions that have been made by using the turbulence model you have chosen. For additional marks, experiment with a variety of different turbulence models, and compare the results and note their effect on the comparison with empirical results.

 

The flow conditions for both the laminar and turbulent cases must be different from those in the tutorials (you may, for example, change the velocity, viscosity and/or pipe diameter). You must also use different mesh settings from those in the tutorials. Discuss potential sources of error and suggest reasons for any differences between your CFD results and those expected from theory.

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