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The document summarizes an Ansys CFD simulation of film cooling effectiveness comparing different shaped cooling holes. It discusses that CFD uses numerical methods to solve complex fluid flows and is used in aerospace, sanitation, medicine, and more. The simulation process in Ansys 15.0 includes CAD modeling, meshing, setup of variables like momentum and boundaries, solution of the mesh, and results analysis including velocity, vorticity, and temperature contour comparisons to experimental data. The simulation aimed to match results from a dissertation on film cooling effectiveness of different hole shapes.
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DENSITY AND SPECIFIC GRAVITY (Density determination of liquids by using hydro...
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Symposium PPT
- 1. Ansys 15.0 CFD Processing SURP 2015 Matt Goodman | Victor Heinen | Josh Solberg Advisor: Dr. Emin Issakhanian
- 2. What is Computational Fluid Dynamics (CFD)? Uses numerical methods to solve complex fluid flows Used in: Aerospace Sanitation Medicine Alternative energy Climate modeling Turbomachinery
- 3. Film-cooling effectiveness Film cooling: uses cool air flowing through a hole to form a barrier between the material and hot fluid Dr. Issakhanian’s dissertation compared the film cooling effectiveness of different shaped holes We tried to duplicate these results using ANSYS Fluent 15.0
- 4. CFD Process There are many methods, which can be chosen based on the desired results We used Ansys 15.0 ● CAD Modeling ● Meshing ● Setup ● Solution ● Results
- 5. Geometry The 3D (CAD) model of the fluid flow was created in SolidWorks Main Flow Channel Plenum (Source of cool water) Hole for cool water to combine with main flow
- 6. Meshing A CAD model is sliced into many individual (finite) elements that can be analyzed using Finite Element Methods (FEM). Meshes can be coarse (large elements) or fine (small elements) depending on the required accuracy and the power of the computer.
- 7. Meshing
- 8. Setup - Input variables to define the flow being modeled I.e. Is the flow Hot or Cold? Moving or Still? Water or Oil? Momentum of fluid Turbulence Pressure Mass flow rate Boundary conditions Temperature throughout fluid Details of interaction between wall and fluid
- 9. Momentum and Boundary Conditions Input Temperature Input
- 10. Setup - Input variables to define the flow being modeled Flow Material Water Air Refrigerant Solution methods - (1st order vs 2nd order equations etc.) Determines amount of computational power put into solution of mesh Higher order solution methods increase the accuracy Initialization
- 11. Solution The program runs numbers until all residuals fall below a chosen value
- 12. Results 3 parameters were measured to try to match the results from Dr. Issakhanian’s dissertation, and a 4th one was found 1. Velocity contours at the exit hole 2. Velocity contours at the midplane of the main flow 3. Vorticity comparison at a YZ-plane located at X/D = 2 (approximately 2cm) away from the exit hole 4. Temperature contours on the bottom plane of the main flow channel
- 13. 1.Exit Hole Velocity Experimental Computational
- 14. 2. Main Flow Velocity Contours Experimental Computational
- 15. 3. X/D = 2 Vorticity Comparison ● Vorticity comparison in the YZ Plane at X/D=2 (approx 2cm) away from the exit hole ComputationalExperimental
- 17. Thank You For Your Time Questions?
Editor's Notes
- Ansys 15.0 was utilized to try to duplicate the results from Dr. Emin Issakhanian’s Ph.D dissertation on film-cooling effectiveness. Film-cooling is a process in which cold fluid enters a hot flow through a hole in the material in order to create a cold “film” that protects the material from the thermal stresses to which it would be exposed otherwise. Dr. Issakhanian’s experiment involved comparing the characteristics of film-cooling through a round hole and an oval-shaped hole. CFD was used to model the characteristics of the oval-shaped hole results. Different characteristics of the velocities were measured and compared to the experimental results.