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# Graduate at Solar Team Twente

Do you want play a part in the development of sustainable transportation and are you currently looking for a graduation assignment?  Do you have affection with Fluid Dynamics and Aerodynamics? Than we have an exciting opportunity for you! Solar Team Twente currently has three graduation assignments at the Thermal and Fluid Engineering department, which can be found below.

Are you interested, or do you have any questions? Don’t hesitate to contact us via a.kiel@solarteam.nl or the contact information listed in the assignment

### MSc Solar Car Inverse Design

For the design of the aerodynamic shape of the car a combination of analysis methods is in use by Solar Team Twente.For example, the 2D airfoil analysis & design program XFOIL is used to design the longitudinal cross-sections of thebody and the wheel cowlings. These cross-sections are then input in the design of the full 3D geometry. This 3Dgeometry is discretized and a volume grid around the body is generated. The volume grid is then input for a numericalsimulation method that solves the Reynolds-averaged Navier-Stokes equations. This design process for the 3D problemis time-consuming. Especially in the preliminary design phase there is a need for a fast numerical tool chain for accurate3D aerodynamic analysis and design.

In this project you will investigate the theoretical background of a 3D inverse aerodynamic design tool based on a boundary element method. For a simple geometry, a numerical algorithm is implemented that finds a new surface geometry description that gives a specified surface pressure distribution for a selected flow condition. Part of the project are the following elements:

• Literature study
• Mathematical formulation of the inverse design of a 3D surface approximating a specified pressure distribution
• Discretization of the equations
• Implementation in Fortran
• Inverse aerodynamic design and reconstruction of simple 3D geometries
• Discussion of the numerical results
• Report ### MSc Solar Car Streamline IBL

For the design of the aerodynamic shape of the car a combination of analysis methods is in use by Solar Team Twente. For example,the 2D airfoil analysis & design program XFOIL is used to design the longitudinal cross-sections of the body and the wheelcowlings. These cross-sections are then input in the design of the full 3D geometry. This 3D geometry is discretized and a volumegrid around the body is generated. The volume grid is then input for a numerical simulation method that solves the ReynoldsaveragedNavier-Stokes equations. This design process for the 3D problem is time-consuming. Especially in the preliminary designphase there is a need for a fast numerical tool chain for accurate 3D aerodynamic analysis and design. In this project you will develop an integral boundary layer method that uses the pressure distribution along a streamline. This streamline pressure distribution is the result of a simulation with a multilevel panel method that models the equations for inviscid and incompressible flow. Part of the work is determining the streamlines by integration the surface velocity vector distribution. The results of such a boundary layer analysis on a solar cargeometry can be used to direct the redesign of the car body.

Part of the project are the following elements

• Literature study
• Mathematical formulation for determining the streamline through a selected point.
• Mathematical formulation of the laminar and turbulent integral boundary equations.
• Mathematical description of a simple laminar-turbulent transition model.
• Discretization of the equations
•  Implementation in Fortran
• Aerodynamic analysis of simple 3D geometries and (possibly) a solar car from a previous race
• Discussion of the numerical results
• Report ### MSc Solar Car Parametric Design

For the design of the aerodynamic shape of the solar car a combination of analysis methods is in use by Solar TeamTwente. For example, the 2D airfoil analysis & design program XFOIL is used to design the longitudinal cross-sectionsof the body and the wheel cowlings. These cross-sections are then input in the design of the full 3D geometry. This 3Dgeometry is discretized and a volume grid around the body is generated. The volume grid is then input for a numericalsimulation method that solves the Reynolds-averaged Navier-Stokes equations. This design process for the 3D problemis time-consuming. Especially in the preliminary design phase there is a need for a fast numerical tool chain for accurate3D aerodynamic analysis and design. In this project you will develop a set of tools for the parametric description of the solar car external surface. This parametric description is input for the structured grid generator.

Part of the project are the following elements:

• Literature study
• Mathematical formulation of the parametric surface description
•  Mathematical definition of the structured surface grid generator
•  Discretization of the equations
• Implementation in Fortran(?)
• Preliminary design(s) for the 2019 solar car
• Numerical flow simulation with a panel method
• Discussion of the numerical results
• Report 