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Harvard
Zaya, J. (2013) Aerodynamic Optimization of Ground Vehicles with the Use of Fluent’s Adjoint Solver. Göteborg : Chalmers University of Technology (Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, nr: 2013:01).
BibTeX
@mastersthesis{
Zaya2013,
author={Zaya, Johan},
title={Aerodynamic Optimization of Ground Vehicles with the Use of Fluent’s Adjoint Solver},
abstract={Like all other areas of the automotive development, environmental issues and fuel efficiency is
one of the main driving forces for aerodynamic engineers where the aerodynamic drag force is
the dominating resistance force at higher velocities. By improving the shape of a vehicle with
respect to aerodynamic performance, the drag force can be reduced hence the fuel consumption
can be reduced.
The use of Computational Fluid Dynamics is a widely used methodology to carry out simulations
that describes the flow in and around a vehicle. With these simulations, aerodynamic engineers
can gather information about the aerodynamic performance
Of the vehicle and make changes that can improve the performance. However, due to the many
variables involved, this can become very computer demanding process and require a high
number of design optimization cycles to finally reach valuable stage.
Recently, a new procedure used for optimization purposes, named the Adjoint Solver, has been
the focus of researchers and engineers. The Fluent Adjoint solver compute derivatives of chosen
engineering observation, such as drag, with respect to all inputs and provides a more direct
guidance for optimal modifications to improve performance. The Adjoint Solver accomplishes to
calculate the derivative data by running only one single computation, very similar to basic CFD
computations, and by that providing valuable engineering insight that can both improve and
reduce the number for design optimization cycles.
The main goal of this master thesis is to state if the Adjoint Solver is ready to be incorporated into
Volvo Cars Aerodynamic development process.
This project has been carried out as an Master Thesis together with Volvo Cars and Chalmers
University of Technology, in a close relationship with Ansys which are the developers of Fluent.
Fluent's Adjoint Solver has been tested on its computation abilities, robustness, computer
requirements and functionality. The tests are done on four different vehicle models provided by
Volvo Cars and simulations are computed in wide variation of different case setups.
Based on the results from the simualtions, the conclusion is that Fluent Adjoint Solver is at the
moment not at a stage where it is ready to be incorporated as a part of the development process.
It is proven that the one can gain valuable engineering insight that surely can improve the
development process, however, for external aerodynamics, the Adjoint Solver is not yet ready.
Ansys will now continue to develop and improve the Adjoint Solver, with the issues discovered in
this project in mind.},
publisher={Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system, Chalmers tekniska högskola},
place={Göteborg},
year={2013},
series={Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2013:01},
keywords={CFD, Aerodynamics, Optimization, Fluent, Adjoint Solver, Volvo Cars},
}
RefWorks
RT Generic
SR Electronic
ID 175630
A1 Zaya, Johan
T1 Aerodynamic Optimization of Ground Vehicles with the Use of Fluent’s Adjoint Solver
YR 2013
AB Like all other areas of the automotive development, environmental issues and fuel efficiency is
one of the main driving forces for aerodynamic engineers where the aerodynamic drag force is
the dominating resistance force at higher velocities. By improving the shape of a vehicle with
respect to aerodynamic performance, the drag force can be reduced hence the fuel consumption
can be reduced.
The use of Computational Fluid Dynamics is a widely used methodology to carry out simulations
that describes the flow in and around a vehicle. With these simulations, aerodynamic engineers
can gather information about the aerodynamic performance
Of the vehicle and make changes that can improve the performance. However, due to the many
variables involved, this can become very computer demanding process and require a high
number of design optimization cycles to finally reach valuable stage.
Recently, a new procedure used for optimization purposes, named the Adjoint Solver, has been
the focus of researchers and engineers. The Fluent Adjoint solver compute derivatives of chosen
engineering observation, such as drag, with respect to all inputs and provides a more direct
guidance for optimal modifications to improve performance. The Adjoint Solver accomplishes to
calculate the derivative data by running only one single computation, very similar to basic CFD
computations, and by that providing valuable engineering insight that can both improve and
reduce the number for design optimization cycles.
The main goal of this master thesis is to state if the Adjoint Solver is ready to be incorporated into
Volvo Cars Aerodynamic development process.
This project has been carried out as an Master Thesis together with Volvo Cars and Chalmers
University of Technology, in a close relationship with Ansys which are the developers of Fluent.
Fluent's Adjoint Solver has been tested on its computation abilities, robustness, computer
requirements and functionality. The tests are done on four different vehicle models provided by
Volvo Cars and simulations are computed in wide variation of different case setups.
Based on the results from the simualtions, the conclusion is that Fluent Adjoint Solver is at the
moment not at a stage where it is ready to be incorporated as a part of the development process.
It is proven that the one can gain valuable engineering insight that surely can improve the
development process, however, for external aerodynamics, the Adjoint Solver is not yet ready.
Ansys will now continue to develop and improve the Adjoint Solver, with the issues discovered in
this project in mind.
PB Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system, Chalmers tekniska högskola,
T3 Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2013:01
LA eng
LK http://publications.lib.chalmers.se/records/fulltext/175630/175630.pdf
OL 30
