UI ENGR 2510 - Simulation of Pipe Flow Using FlowLab 1.1

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Simulation of Pipe Flow Using FlowLab 1.1 (PreLab 1)OutlineWhat is FlowLab?What can FlowLab do?FlowLab interfaceCFD process: Step 1, GeometrySlide 7CFD process: Step 2, PhysicsSlide 9Slide 10CFD process: Step 2, Physics(BCs details)Slide 12CFD process: Step 3, MeshCFD process, step 4, SolveCFD process, step 5, ReportsCFD process 5, reports (import EFD)Reports (examples of results)CFD Process, step 6, Post-Processing (Contours)CFD Process, step 6, Post-Processing (vectors)EFD data format for FlowLabInstructions for setting up parametersOther functionsValidation with AFDAxial velocity profileSimulation of Pipe Flow Using FlowLab 1.1 (PreLab 1) Tao Xing and Fred SternIIHR—Hydroscience & Engineering100 Hydraulics LaboratoriesThe University of Iowa57:020 Mechanics of Fluids & Transport Processeshttp://css.engineering.uiowa.edu/~fluids/October 21, 20032Outline•What is FlowLab?*•What can FlowLab do?*•Tutorial for running FlowLab•EFD data format for FlowLab•Instructions on setting up parameters•Other FlowLab functions•Validation using AFD* From http://www.flowlab.fluent.com3What is FlowLab?•Computational fluid dynamics (CFD) software package designed to help teach fluid mechanics and transport phenomena•Based on ready-to-use exercises, FlowLab eliminates the long learning curve associated with general fluid flow modeling packages•FlowLab exercises are templates created from FLUENT and GAMBIT parameterized files•FlowLab templates available in 57:020 are pipe (CFD Lab1) and airfoil flows(CFD Lab2)4What can FlowLab do?•Reinforce basic concepts of fluid mechanics and heat/mass transfer using computer simulation •Use computing exercises to augment and complement existing laboratory-based curriculum •Expand the learning experience with real-world applications of fluid flow and heat/mass transfer •Expose students to CFD and CFD concepts -- an increasingly important skill in the job market5FlowLab interfaceSketch windowCFD process 1~6Global control buttonsCFD process: step 1, Geometry6CFD process: Step 1, GeometryYou are required to input the minimum parameters to create the geometryReset values to default onesCreate Geometry Go to CFD process, step 2 Units, SI recommended7CFD process: Step 1, GeometryGeometry Created8CFD process: Step 2, PhysicsWith heat transfer?9CFD process: Step 2, Physics10CFD process: Step 2, Physics11CFD process: Step 2, Physics(BCs details)When inlet velocity has a distribution12CFD process: Step 2, Physics(BCs details)13CFD process: Step 3, Mesh14CFD process, step 4, SolveTime history of residualsStop the calculation to see intermediate resultsCalculation will stop if either of the two parameters satisfied15CFD process, step 5, Reports16CFD process 5, reports (import EFD)17Reports (examples of results)Try to determine the location for the flow to become fully developed18CFD Process, step 6, Post-Processing (Contours)Choose the contour variables19CFD Process, step 6, Post-Processing (vectors)Choose appropriate scale to view velocity vectors20EFD data format for FlowLab(title "Velocity Magnitude")(labels "Position" "Velocity Magnitude")((xy/key/label "experimental")0.00 68.259370.005 67.165330.01 64.643570.015 60.60720.02 55.805570.021 54.263330.022 52.456690.023 49.987770.024 47.584170.025 42.3885)Replaced with your own EFD data! Axial velocity profile21Instructions for setting up parameters•Appropriate set-up of parameters can save both time and efforts to get the correct results•Iteration number usually set to a large value (eg. 10000).•The convergence limit for “single-precision” can be larger than 10^-4, but not lower than 10^-5. No restrictions for “double-precision”.•The default scale for plotting velocity vectors is very large, reduce that value to 0.003 or so for a better view22Other functionsFit the view to full sizeAlign the geometry with coordinates23Validation with AFD•The pipe template will be validated using the analytical data for fully developed laminar flows in pipes•Parameters: Pipe radius: R=0.02647 m Pipe length: L=9.144 m Inlet velocity: u=0.2 m/s (Re=610) Using Medium mesh and double precision•Use the equation above to calculate the analytical velocity distributions and save that data to a *.txt file with the format of FlowLab requires.•Questions: Will the change of the outlet gauge pressure affect the axial velocity distribution? Why?  222222228))(32(41))((41rRDVrRDVrRdxdpruaveave24Axial velocity


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UI ENGR 2510 - Simulation of Pipe Flow Using FlowLab 1.1

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