Appendix A

Exercise: Planar Couette Flow Description Wall-driven flow between infinite parallel plates, separated by a distance H. Upper horizontal wall moves at constant velocity, Vwall, while lower horizontal wall is fixed. Left and right vertical boundaries are periodic. May 15, 2001 Inventory #001477 Appendix A-2

Exercise (continued) : Planar Couette Flow Assumption Steady-state Incompressible VY = VZ = 0 VX = VX(Y) only Pressure field is constant No body forces Fluid properties are constant May 15, 2001 Inventory #001477 Appendix A-3

Exercise: Backward Facing Step May 15, 2001 Inventory #001477 Appendix A-4

Exercise (continued) : Backward Facing Step Input File: Step51 Data: Armaly, et. al., “Experimental and Theoretical Investigation of Backward Facing Step Flow", Journal of Fluid Mechanics (1983), vol. 127, pp. 473-496. Inlet length: 2.5 (can be varied by the user) Outlet length: 18 (can be varied by the user) Outlet Condition: P = 0 use density = 1.0 viscosity = .001 Hydraulic diameter Dh = 2(.52) = 1.04 Choose Reynolds Number between 200 and 1000: Watch for the length of the recirculation region and secondary recirculation regions. How much are results affected by the inlet velocity profile? How can the choice of the outlet condition be verified? May 15, 2001 Inventory #001477 Appendix A-5

Exercise: Tube Bundle Flow Description: Turbulent cross-flow over a bundle of circular tubes. Top and bottom horizontal boundaries are planes of symmetry Define all key points in terms of parameters: Create an ALL-QUAD mesh (requires concatenations just before meshing). Concentrate nodes towards tube walls: May 15, 2001 Inventory #001477 Appendix A-6

Exercise: Tube Bundle Flow Concatenated Line Assumptions Steady-state Incompressible Turbulent Fluid properties are constant May 15, 2001 Inventory #001477 Appendix A-7

Exercise: Jet Impingement Heat Exchanger Flow Description In this device, orifice plates are separated by spacer plates in a stack arrangement, with consecutive plates having an offset hole pattern. Multiple jets of coolant fluid impinge on conductive surfaces to maximize heat transfer. The plate stack is metalluragically bonded together to minimize conductive resistance. Flow is to be modeled in the quarter-symmetry section shown. May 15, 2001 Inventory #001477 Appendix A-8

Exercise: Jet Impingement Heat Exchanger Flow Symmetry Section Construct flowfield using top-down techniques. Generate the 12 map-meshable volumes shown below. (The file jetimp.inp can be used to create this geometry.) May 15, 2001 Inventory #001477 Appendix A-9

Map-Meshable Volumes Set ESIZE = 0.2 and map mesh with FLUID142 elements. The jet Reynolds number is 105. Assumptions Steady-state Incompressible Turbulent Fluid properties are constant May 15, 2001 Inventory #001477 Appendix A-10

Exercise: Fan Model Dimensions in inches — Fluid is air. Refer to Elements manual documentation to apply real constant data for fan. May 15, 2001 Inventory #001477 Appendix A-11

Exercise: Counter Current Heat Exchanger May 15, 2001 Inventory #001477 Appendix A-12