A channel wall channel wall F splitter blade F tubes F F Ꭰ B G с E
As shown in Figure 5, you are asked to set up the two-dimensional simulation of a flow in a channel, which is part of a duct system. Flow enters on the left at A, a splitter blade D separates the flow into an open upper channel with wall B and a lower channel with wall G and heat-exchanger tubes F. The flow exits at C and E.
Your simulation is supposed to enable the designer to position the splitter blade D vertically such that the target flowrate through the lower channel is achieved for a given flow-rate entering at A.
a) Choose boundary conditions (b.c.) for the boundaries A-G from the types of b.c. typically implemented with an incompressible CFD solver. State what quantities those b.c. impose, and which they leave undefined. Justify your choice of boundary condition.
[12 marks]
b) Discuss the most important errors your choice of b.c. may introduce and how those could be remedied [4 marks]
c) While walking past your desk, your team-leader reminds you that the quantity of interest is the massflow in the lower channel, and proposes to use a slip-wall condition for B. Unfortunately she doesn’t explain her reasoning. For the next team meeting, prepare a discussion of the pros and cons of that suggestion, and explain whether or not you think this suggestion should be followed.
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