CFD_lab2-Exercise_Note

# CFD_lab2-Exercise_Note - Parametric Studies of Turbulent...

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1 Parametric Studies of Turbulent Flow around an Airfoil 57:020 Mechanics of Fluids and Transport Processes CFD LAB 2 By Tao Xing and Fred Stern IIHR-Hydroscience & Engineering The University of Iowa C. Maxwell Stanley Hydraulics Laboratory Iowa City, IA 52242-1585 1. Purpose The Purpose of CFD Lab 2 is to conduct parametric studies for turbulent flow around Clarky airfoil following the “CFD process” by an interactive step -by- step approach. Students will have “hands - on” experiences using FlowLab to investigate the effect of angle of attack and effect of different turbulence models on the simulations results. These effects will be studied by comparing simulation results with EFD data. Students will analyze the differences and possible numerical errors, and present results in Lab report. Flow Chart for ISTUE Teaching Module for Airfoil flow (red color illustrates the options you will use in CFD Lab 2) Geometry Post-processing Report Physics Mesh Contours Vectors Streamlines Solve Iterations Conver- gent. Limit Precisions Single Double Numerical Schemes 1 st order 2 nd order QUICK Steady / Unsteady? Coarse Medium Fine Automatic Manual Structured Unstruct- ured Boundary Conditions Flow Properties Viscous Models One Eq. Two Eq. Density and viscosity Laminar Turbulen t Inviscid SA k-e k-w Heat Transfer? Incompress -ible? Initial Conditions Clarky NACA12 LS(1) 0417 Import Profile Chord length Angle of attack Select domain Select geometry Wall shear stress Skin friction Factor XY plots Verification and validation Coefficient of lift Coefficient of drag Residuals Pressure coef. Distri. Shear stress Distri. Airfoil Y plus

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2 2. Simulation Design In EFD Lab 3, you have conducted experimental study for turbulent airfoil flow around a ClakY airfoil (Re 300,000). The data you have measured were used for CFD PreLab 2. In CFD Lab 2, simulation will be conducted under the same conditions of EFD Lab 3, except angle of attack and turbulent models that will be changed in this lab. The problem to be solved is the turbulent flow around the Clarky airfoil with angle of attack ( ) In the figure above, C is the chord length of the airfoil, is the angle of attack, and Rc is the radius of the “O” domain . 3. CFD Process Step 1: (Geometry)
3 Choose “Clark Y ” airfoil and “O typ e” domain. Input the following conditions: 1. Select Geometry (Clarky) 2. Select domain (O type) 3. Chord length (0.3048 m) 4. Angle of attack ( 16 degrees ) 5. Mesh type (Map) 6. Circle Radius Rc (6m) You need to push “create” button after you enter the values for the cha nges to take effect.

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