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Simulation of turbulent airfoil Flow Using FlowLab 1.1 (CFD PreLab 2)

Simulation of turbulent airfoil Flow Using FlowLab 1.1 (CFD PreLab 2). Tao Xing and Fred Stern IIHR—Hydroscience & Engineering 100 Hydraulics Laboratories The University of Iowa 57:020 Mechanics of Fluids & Transport Processes http://css.engineering.uiowa.edu/~fluids/ Dec 2, 2003. Outline.

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Simulation of turbulent airfoil Flow Using FlowLab 1.1 (CFD PreLab 2)

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  1. Simulation of turbulent airfoil Flow Using FlowLab 1.1 (CFD PreLab 2) Tao Xing and Fred Stern IIHR—Hydroscience & Engineering 100 Hydraulics Laboratories The University of Iowa 57:020 Mechanics of Fluids & Transport Processes http://css.engineering.uiowa.edu/~fluids/ Dec 2, 2003

  2. Outline • Assignments for CFD PreLab2 and Lab2 • What data you need prepare before coming to CFD Prelab2 and Lab2? • Detailed tutorial for simulating turbulent flow around airfoil using FlowLab 1.1 • Other FlowLab functions • Data need to be saved for CFD report

  3. Assignments for PreLab2 and Lab2 • CFD PreLab2: 1. Run FlowLab using same conditions in EFD Lab 3. 2. Validate FlowLab predictions(pressure and lift coefficients) with EFD measurements 3. Inviscid flow vs. viscous flow • CFD Lab 2: 1. Parametric studies: effect of angle of attacks, effect of turbulent models, and effect of meshes.

  4. Data need to be ready before PreLab 2 and Lab 2 • EFD3 report, or EFD data: 1. Angle of attack 2. Chord length of the foil 3. Inlet velocity (or Re) 4. Air properties 5. Pressure coefficient distribution 6. Lift and drag coefficient • A floppy disk to save documents or figures • Slides 5~21 show a tutorial example

  5. Tutorial • Simulation conditions: 1. Foil: Clarky airfoil 2. Chord length: 1 foot (0.3048m) 3. Angle of attack: 12 degree 4. Domain: C type domain 5. Fluid properties: air at 22.4 degree, density: 1.1949 kg/m^3 viscosity: 1.8320e-5 kg/m.s 6. Inlet velocity: 7.04 m/s 7. Turbulent model: k-epsilon 8. Medium mesh 9. Double precision

  6. FlowLab interface CFD process 1~6 CFD process: step 1, Geometry Sketch window

  7. CFD process: Step 1, Geometry Units, SI recommended Reset values to default ones Go to CFD process, step 2 Create Geometry You are required to input the minimum parameters to create the geometry

  8. CFD process: Step 1, Geometry Geometry Created

  9. CFD process: Step 2, Physics

  10. CFD process: Step 2, Physics

  11. CFD process: Step 2, Physics(BCs details) Use default values Use uniform flow at inlet

  12. CFD process: Step 2, Physics(BCs details)

  13. CFD process: Step 3, Mesh

  14. CFD process, step 4, Solve Stop the calculation to see intermediate results Time history of residuals Calculation will stop if either of the two parameters satisfied

  15. CFD process, step 5, Reports

  16. CFD process 5, reports (import EFD)

  17. Reports (examples of results)

  18. CFD Process, step 6, Post-Processing (Contours) Choose the contour variables

  19. CFD Process, step 6, Post-Processing (streamlines)

  20. CFD Process, step 6, Post-Processing (vectors) Choose appropriate scale to view velocity vectors

  21. EFD data format for FlowLab (title "Pressure coefficient") (labels "Position" "pressure coefficient") ((xy/key/label "experimental") 0 -0.526354204 0.00381 -1.670297341 0.00762 -1.880839023 0.01524 -1.880839023 0.02286 -1.775568182 0.03048 -1.621170949 0.04572 -1.438701491 0.06096 -1.291322314 0.09144 -1.221141754 0.12192 -0.708823662 0.1524 -0.652679213 0.18288 -0.505300036 0.21336 -0.385993083 0.24384 -0.217559738 0.27432 -0.098252785 0.27432 0 0.24384 -0.007018056 0.21336 0.03509028 0.18288 0.021054168 0.1524 0.063162504 0.12192 0.112288897 0.09144 0.147379177 0.06096 0.224577794 0.04572 0.245631962 0.03048 0.273704186 0.02286 0.315812522 0.01524 0.449155587 0.00762 0.603552821 0.00381 0.870238951 ) Replaced with your own EFD data!

  22. Other functions Fit the view to full size Align the geometry with coordinates

  23. Other functions

  24. Data need to be saved for report • CFD PreLab2: 1. time history of residuals (residuals vs. iteration number), 2. pressure and lift coefficients (both CFD and EFD); 3. contour of pressure (CFD), 4. contour of velocity, 5. velocity vectors(CFD), 6. streamlines • Detailed instructions, see assignments in Lab documents

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