NUMERICAL OPTIMALISATION OF RACING CAR FOR THE SHELL ECO-MARATHON RACE

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The subject of the study was the conceptual model of high-performance, ecofriendly urban car for the competition Shell Eco Marathon 2014 and 2015. The research was carried out as the part of the racing team Smart Power Urban Silesian University of Technology work. The study developed methods for conducting aerodynamic research for such types of vehicles. The numerical models of conceptual development versions of the vehicle were created in the HyperWorks HyperMesh software with using the CFD module basing on the developed methodology. Simulation conditions were chosen according to the conditions during the race Shell Eco Marathon in Rotterdam and in accordance with generally accepted principles of tunnel research in the tunnel of the Institute of Aviation in Warsaw. In the research the resulting values ​​were the distribution of the drag forces and pressure distribution on the surface of the vehicle. In addition, using the software HyperView obtained the distribution of the airlines affecting the vehicle. Based on the obtained value ​​of the aerodynamic drag force on the surface of the vehicle, the aerodynamic coefficient Cx is calculated analytically. Analyzes suggest which version is considered the most advantageous from the point of view of minimizing drag force. Based on that model there will be made ​​prototype car. The analyzes outlined the direction of development of the solid of the conceptual car the next seasons for the Shell Eco Marathon race. After the completion of the car build is planned to make verification of the numerical research with the aerodynamic tests in the wind tunnel.

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NUMERICAL OPTIMALISATION OF RACING CAR FOR THE SHELL ECO-MARATHON RACE

  1. 1. NUMERICAL OPTIMISATION OF THE RACING CAR FOR THE SHELL ECO-MARATHON RACE B.Sc.Mateusz WASIK M.Sc. Miroslaw Tarogsz, Ph.D B.Sc. Wawrzyniec Panfil Institute of Fundamentals of Machinery Design Silesian University of Technology Munich, 2014 B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 1 / 18
  2. 2. Table of Contents Project Objectives Problem definition Methodology of numerical research Analysis Results of the research Analyzed models Conclusions Bibliography B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 2 / 18
  3. 3. Table of Contents Project Objectives Problem definition Methodology of numerical research Analysis Results of the research Analyzed models Conclusions Bibliography B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 2 / 18
  4. 4. Table of Contents Project Objectives Problem definition Methodology of numerical research Analysis Results of the research Analyzed models Conclusions Bibliography B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 2 / 18
  5. 5. Table of Contents Project Objectives Problem definition Methodology of numerical research Analysis Results of the research Analyzed models Conclusions Bibliography B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 2 / 18
  6. 6. Table of Contents Project Objectives Problem definition Methodology of numerical research Analysis Results of the research Analyzed models Conclusions Bibliography B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 2 / 18
  7. 7. Table of Contents Project Objectives Problem definition Methodology of numerical research Analysis Results of the research Analyzed models Conclusions Bibliography B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 2 / 18
  8. 8. Table of Contents Project Objectives Problem definition Methodology of numerical research Analysis Results of the research Analyzed models Conclusions Bibliography B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 2 / 18
  9. 9. Table of Contents Project Objectives Problem definition Methodology of numerical research Analysis Results of the research Analyzed models Conclusions Bibliography B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 2 / 18
  10. 10. Project Objectives Figure: Smart Power Silesian University of Technology racing team B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 3 / 18
  11. 11. Problem definition Optimisation of the car aerodynamic features: Air drag force on the cars surface. Air pressure distribution on the surface of the car. Air stream lines simulation around the body. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 4 / 18
  12. 12. Problem definition Optimisation of the car aerodynamic features: Air drag force on the cars surface. Air pressure distribution on the surface of the car. Air stream lines simulation around the body. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 4 / 18
  13. 13. Problem definition Optimisation of the car aerodynamic features: Air drag force on the cars surface. Air pressure distribution on the surface of the car. Air stream lines simulation around the body. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 4 / 18
  14. 14. Methodology of numerical research Figure: CAD models of the urban car Bytel in the development versions a) v1 b) v2 c) v3 d) v4. Designed by Artur Lach. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 5 / 18
  15. 15. Methodology of numerical research Vehicle aerodynamic analysis process can be divided into the following steps: Stage 1: CATIA V5. Creating a CAD model. Simplification of the CAD model. Exporting the CAD model into universal CAD format. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 6 / 18
  16. 16. Methodology of numerical research Vehicle aerodynamic analysis process can be divided into the following steps: Stage 1: CATIA V5. Creating a CAD model. Simplification of the CAD model. Exporting the CAD model into universal CAD format. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 6 / 18
  17. 17. Methodology of numerical research Vehicle aerodynamic analysis process can be divided into the following steps: Stage 1: CATIA V5. Creating a CAD model. Simplification of the CAD model. Exporting the CAD model into universal CAD format. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 6 / 18
  18. 18. Methodology of numerical research Stage 2.:Hyperworks Hypermesh. Importing a CAD model to the preprocesor. Adjusting the model to the preprocesor conditions. Putting the grid on imported CAD model. Creating a wind tunnel model and its finite element mesh in the simulation preprocessor . Creating a boundary layer on the surface of the car and the grid fill of the space between the tunnel and the car. Export created model to the simulation solver. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 7 / 18
  19. 19. Methodology of numerical research Stage 2.:Hyperworks Hypermesh. Importing a CAD model to the preprocesor. Adjusting the model to the preprocesor conditions. Putting the grid on imported CAD model. Creating a wind tunnel model and its finite element mesh in the simulation preprocessor . Creating a boundary layer on the surface of the car and the grid fill of the space between the tunnel and the car. Export created model to the simulation solver. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 7 / 18
  20. 20. Methodology of numerical research Stage 2.:Hyperworks Hypermesh. Importing a CAD model to the preprocesor. Adjusting the model to the preprocesor conditions. Putting the grid on imported CAD model. Creating a wind tunnel model and its finite element mesh in the simulation preprocessor . Creating a boundary layer on the surface of the car and the grid fill of the space between the tunnel and the car. Export created model to the simulation solver. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 7 / 18
  21. 21. Methodology of numerical research Stage 2.:Hyperworks Hypermesh. Importing a CAD model to the preprocesor. Adjusting the model to the preprocesor conditions. Putting the grid on imported CAD model. Creating a wind tunnel model and its finite element mesh in the simulation preprocessor . Creating a boundary layer on the surface of the car and the grid fill of the space between the tunnel and the car. Export created model to the simulation solver. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 7 / 18
  22. 22. Methodology of numerical research Stage 2.:Hyperworks Hypermesh. Importing a CAD model to the preprocesor. Adjusting the model to the preprocesor conditions. Putting the grid on imported CAD model. Creating a wind tunnel model and its finite element mesh in the simulation preprocessor . Creating a boundary layer on the surface of the car and the grid fill of the space between the tunnel and the car. Export created model to the simulation solver. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 7 / 18
  23. 23. Methodology of numerical research Stage 2.:Hyperworks Hypermesh. Importing a CAD model to the preprocesor. Adjusting the model to the preprocesor conditions. Putting the grid on imported CAD model. Creating a wind tunnel model and its finite element mesh in the simulation preprocessor . Creating a boundary layer on the surface of the car and the grid fill of the space between the tunnel and the car. Export created model to the simulation solver. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 7 / 18
  24. 24. Methodology of numerical research Stage 3.:AcuSolve Setting the boundary conditions and the parameters of simulation. In case of the dynamic simulation including initial conditions Implementation of numerical simulation. Stage 4.:Hyperview Postprocessing of obtained data. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 8 / 18
  25. 25. Methodology of numerical research Stage 3.:AcuSolve Setting the boundary conditions and the parameters of simulation. In case of the dynamic simulation including initial conditions Implementation of numerical simulation. Stage 4.:Hyperview Postprocessing of obtained data. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 8 / 18
  26. 26. Methodology of numerical research Stage 3.:AcuSolve Setting the boundary conditions and the parameters of simulation. In case of the dynamic simulation including initial conditions Implementation of numerical simulation. Stage 4.:Hyperview Postprocessing of obtained data. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 8 / 18
  27. 27. Analysis Boundary conditions set for simulation Medium: Air MKS Temperature: 25deg Pressure: 1 atm Inlet velocity: 10 m/s Outlet pressure: 0 atm Turbulence model: Spalart-Almaras Turbulence ratio: 1.05 (5%) B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 9 / 18
  28. 28. Results of the research Four development versions of the car Bytel were analysed: Bytel v1 Bytel v2 Bytel v3 Bytel v4 Table: Comparison of the drag force and the drag coefficient Cx for each body version Version Drag force [N] Aerodynamic drag coefficient Cx Bytel v1 21.66 0.349897 Bytel v2 19.8 0.31985 Bytel v3 18.57 0.299981 Bytel v4 19.78 0.319527 B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 10 / 18
  29. 29. Analyzed models Figure: Comparison of air pressure distribution on the surfaces of development versions v3 (pictured left) and v4 (pictured right). B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 11 / 18
  30. 30. Analyzed models Figure: Comparison of distributions of air velocity in the plane coinciding with the plane of symmetry of the vehicle. Development version v3 (pictured top) and v4 (see figure below). B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 12 / 18
  31. 31. Analyzed models Figure: Comparison of distributions of the streamlines around the car. Development version v3 (pictured left) and v4 (pictured right). B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 13 / 18
  32. 32. Conclusions Based on this type of research there can be identified the body parts that have a significant impact on the aerodynamic resistance of the vehicle. Research on the numerical model can not completely replace the test tunnel but significantly simplifies the process of creating a physical model. The research shows that the greatest impact on the result of aerodynamic drag has the shape transition between faces of the car, i.e. the transition between the mask and the front glass, and between the roof and pillars. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 14 / 18
  33. 33. Conclusions Based on this type of research there can be identified the body parts that have a significant impact on the aerodynamic resistance of the vehicle. Research on the numerical model can not completely replace the test tunnel but significantly simplifies the process of creating a physical model. The research shows that the greatest impact on the result of aerodynamic drag has the shape transition between faces of the car, i.e. the transition between the mask and the front glass, and between the roof and pillars. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 14 / 18
  34. 34. Conclusions Based on this type of research there can be identified the body parts that have a significant impact on the aerodynamic resistance of the vehicle. Research on the numerical model can not completely replace the test tunnel but significantly simplifies the process of creating a physical model. The research shows that the greatest impact on the result of aerodynamic drag has the shape transition between faces of the car, i.e. the transition between the mask and the front glass, and between the roof and pillars. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 14 / 18
  35. 35. Cars visualisation Figure: Bytel urban car. Design Artur Lach B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 15 / 18
  36. 36. Cars visualisation Figure: Bytel urban car. Design Artur Lach B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 16 / 18
  37. 37. Bibliography Raport instytutu lotnictwa. Badania bolidu MuSHELLka. Badania wagowe współczynników aerodynamicznych i wizualizacja opływu, Warszawa : Instytut lotnictwa, 2012. Janusz Piechna. Podstawy aerodynamiki pojazdów. Podstawy aerodynamiki pojazdów, Warszawa: Wydawnictwa Komunikacji i Łączności, 2000. Frank M. White. Rodzaje przepływów. Fluid Mechanics 4th Edition, Mcgraw-Hill College, 1998. B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 17 / 18
  38. 38. Thank you for your attention! B.Sc.Mateusz WASIK wasik.mateusz@hotmail.com Silesian University of Technology POLAND 18 / 18

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