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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 39509 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Farhanieh, Bijan
- Abstract:
- In optimum design, the goal is to optimize the flow and heat transfer, considering the system limitations. In this research, inverse design is used as a new approach for optimization of aerodynamic ducts and shows that optimization of duct geometry is equivalent to the optimization of the pressure acting on the wall. In order to calculate the optimum pressure distribution, boundary layer equations were solved taking into account the pressure gradient. Moreover, with the help of genetic algorithm a pressure distribution can be obtained that offers the maximum pressure, avoiding fluid separation. It is obvious that this condition is equivalent to maximum pressure recovery in the aerodynamic ducts avoiding fluid separation. Keller’s box method which is both efficient and robust is used for solution of boundary layer equation. In order to validate the developed method obtained results are compared with the results of Blasius and Howarth solutions. Optimum pressure distribution is used as the Target Pressure Distribution (TPD) for the inverse design method. The optimum pressure distribution is used to obtain optimum geometry of aerodynamic ducts. In this thesis, a novel method is introduced for optimizing aerodynamic ducts using Fluent software as a solver of flow flied. Developed approach of inverse design is called ball spine method (BSM) which is an iterative method within which geometry optimization continues until wall pressure distribution is reach to the Target Pressure Distribution. UDF (User Defined Functions) Programming in Fluent was considered to be able to apply to this new method for different geometries and flow features. Validation of developed method of inverse design is approved by solving numerous problems with different initial and boundary conditions. In conclusion, a case study was completed calculating the pressure coefficient in a diffuser. Increased pressure coefficient after distribution compared to the linear pressure distribution and showed the advantages of this novel method
- Keywords:
- Optimization ; Boundary Layer Flow ; Genetic Algorithm ; Aerodynamic Ducts ; Inverse Design
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