UI ENGR 2510 - Simulation of Turbulent Flow around an Airfoil

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Simulation of Turbulent Flow around an Airfoil57:020 Mechanics of Fluids and Transport ProcessesSimulation of Turbulent Flow around an AirfoilSubmitted to: Professor Frederick Stern Name:______________ Fluids ID:______________ E-mail:_____________ Department:______________ Group:______________Lab Date: Month/Date/YearSubmission Date: Month/Date/Year0I. CFD PreLab 2 Questions (submitted before PreLab1, 10 points)II. Test and Simulation Design (10 points) Using your own words to describe the purpose of the CFD simulation.III. CFD Process (10 points) Using either table or Flow chart to describe the correct CFD Process, which options will be used in CFD PreLab 1 and CFD Lab 1, and what parameters (with values) need to be specified for each option.IV. Data Analysis and Discussion (50 points)1. Figures, data and questions in CFD PreLab 2 (Simulation of Turbulent flow around an airfoil, 20 points) A. Validation using EFD Lab 3 data using k-e model (7 points) EFD CFD Relative Error (%)Lift coef.Drag coef. Figure 1. ResidualsFigure 2. Pressure coefficient distribution(CFD and EFD)Figure 3. Contour of pressureFigure 4. Contour of velocity magnitude Figure 5. Velocity vectors1Figure 6. Streamlines close to airfoil surfaceB. Inviscid Flow Simulation (7 points)Lift Coefficient (CFD)=____________Drag Coefficient (CFD)=_____________ Figure 1. ResidualsFigure 2. Pressure coefficient distribution(CFD only)Figure 3. Contour of pressureFigure 4. Contour of velocity magnitude Figure 5. Velocity vectorsFigure 6. Streamlines close to airfoil surface2C. Questions in CFD PreLab 2 (6 points) (1). Does inviscid flow has boundary layer near the wall? Zoom in the near wall region and describe the differences of velocity vectors near the airfoil surface for inviscid and viscous flows. Answer: ….. (2). What are the correct boundary conditions for velocity and pressure at “inlet” and “outlet”. Answer: ….. (3). What are the values for lift and drag coefficients for inviscid flow around the airfoil? Are they both zero? Answer: ….. (4). Where are the highest and lowest locations for pressure and velocity magnitude? Why? Is pressure constant for inviscid flows around airfoil? Answer: ….. (5). For turbulent flow around airfoil, try to qualitatively explain why there is a lift force (vertical up) on an airfoil using the contour plot of pressure or the XY plot of pressure coefficient distribution. Answer: ….. 2. Figures, data, and questions in CFD Lab 2 (Parametric Studies of turbulent flow around an airfoil, 30 points) A. Figures and tables in CFD Lab 2 (Effect of Angle of attack, 6 points). Figure 1. ResidualsFigure 2. Pressure coefficient distribution 3EFD CFD Relativeerror (%)Liftcoef.Dragcoef.(CFD and EFD) Figure 3. Contour of pressureFigure 4. Velocity vectors Figure 5. Streamlines close to airfoil surfaceB. Figures and tables in CFD Lab 2 (Effect of turbulent models, k-w, 6 points). Figure 1. ResidualsFigure 2. Pressure coefficient distribution (CFD and EFD)Figure 3. Contour of pressureFigure 4. Velocity vectors Figure 5. Streamlines close to airfoil surfaceC. Questions in CFD Lab 2 (18 points)C.1. For effect of angle of attack: (1). Which angle of attack simulation requires more iterations to converge? Answer: …..4EFD CFD Relativeerror (%)Liftcoef.Dragcoef.(2). Which angle of attack produces higher lift/drag coefficients? Why? Answer: ….. (3). Describe the differences of streamline distributions near the trailing edge of airfoil surface for these two different angles of attack. Do you observe separations for both? Answer: …..C.2. For effect of different turbulence models:(1). Do the two different turbulence models have the same convergence path? If not, which one requires more iterations to converge. Answer: …..(2). Do the two different turbulence models predict the same results? If not, which model predicts more accurately by comparing with EFD data? Answer: ….. C.3. For the following contour plot, qualitatively compare the values of pressure and velocity magnitude at point 1 and 2, if the flow is from left to right. Which location has higher pressure and which location has higher velocity magnitude? Why? Answer: ….. V. Conclusions (15 points)A. Conclusions regarding achieving purpose of simulation (3 points) …..B. What I have learned from CFD Lab. (6 points) …..C. Comments on the hands-on experience, the software interface, and overall lab performance (4 points) …..D. Suggestions and improvements (2 points)51


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UI ENGR 2510 - Simulation of Turbulent Flow around an Airfoil

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