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**Harvard**

Tzanakis, A. (2014) *Duct optimization using CFD software `ANSYS Fluent Adjoint Solver'*. Göteborg : Chalmers University of Technology (Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, nr: 2014:43).

** BibTeX **

@mastersthesis{

Tzanakis2014,

author={Tzanakis, Athanasios},

title={Duct optimization using CFD software `ANSYS Fluent Adjoint Solver'},

abstract={The ordinary duct development procedure in Climate sector at VVC relies on the manual evaluation of the
CFD results and the identication of the proper geometry changes in order to optimize the ducts shape. A
newly introduced methodology in automotive sector, the adjoint procedure, could reduce the duration of a
duct development process through an automatic iterative procedure. Having computed the
ow results, the
adjoint obtains the geometry's sensitivity eld which depicts the potential changes in the domain with respect
to the cost function. Then a morphing tool utilizes that data and properly modies the geometry. The current
thesis is focused on experiencing and demonstrating the merits of the adjoint solver aiming to minimize the
cost function, the pressure drop, over a duct domain.
The discrete adjoint method was applied to dierent geometries from the Climate sector examining the
prerequisites for extended adjoint use. Through those geometries both the adjoint solver and the morphing tool
limitations were discovered. The limitations are mostly related to the mesh, the adjoint discretization scheme
as well as the boundary constraints. During the thesis, the limitations were identied and properly examined,
proposing solutions. An adequate adjoint solution was obtained when using a coarse Polyhedral mesh with
cell skewness around 0.8, a low discretization scheme and a simplied geometry. Even if some compromises
were required in whole procedure, the adjoint has managed to handle all the given geometries. Moreover, new
optimized domains with respect to the cost function, the pressure drop minimization,were developed.
The result of the thesis was a guide of how to overcome adjoint constraints as well as an analytical illustration
of the adjoint results. In some cases, the pressure drop was minimized by 60% resulting in a smooth pressure
distribution over the given domain. However, a compromise in the morphing tool leaves room for improvement
on the suggested methodology.},

publisher={Institutionen för tillämpad mekanik, Fordonsteknik och autonoma system, Chalmers tekniska högskola},

place={Göteborg},

year={2014},

series={Diploma work - Department of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, no: 2014:43},

keywords={Adjoint, Optimization, Duct, Pressure drop, Methodology},

}

** RefWorks **

RT Generic

SR Electronic

ID 202020

A1 Tzanakis, Athanasios

T1 Duct optimization using CFD software `ANSYS Fluent Adjoint Solver'

YR 2014

AB The ordinary duct development procedure in Climate sector at VVC relies on the manual evaluation of the
CFD results and the identication of the proper geometry changes in order to optimize the ducts shape. A
newly introduced methodology in automotive sector, the adjoint procedure, could reduce the duration of a
duct development process through an automatic iterative procedure. Having computed the
ow results, the
adjoint obtains the geometry's sensitivity eld which depicts the potential changes in the domain with respect
to the cost function. Then a morphing tool utilizes that data and properly modies the geometry. The current
thesis is focused on experiencing and demonstrating the merits of the adjoint solver aiming to minimize the
cost function, the pressure drop, over a duct domain.
The discrete adjoint method was applied to dierent geometries from the Climate sector examining the
prerequisites for extended adjoint use. Through those geometries both the adjoint solver and the morphing tool
limitations were discovered. The limitations are mostly related to the mesh, the adjoint discretization scheme
as well as the boundary constraints. During the thesis, the limitations were identied and properly examined,
proposing solutions. An adequate adjoint solution was obtained when using a coarse Polyhedral mesh with
cell skewness around 0.8, a low discretization scheme and a simplied geometry. Even if some compromises
were required in whole procedure, the adjoint has managed to handle all the given geometries. Moreover, new
optimized domains with respect to the cost function, the pressure drop minimization,were developed.
The result of the thesis was a guide of how to overcome adjoint constraints as well as an analytical illustration
of the adjoint results. In some cases, the pressure drop was minimized by 60% resulting in a smooth pressure
distribution over the given domain. However, a compromise in the morphing tool leaves room for improvement
on the suggested methodology.

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: 2014:43

LA eng

LK http://publications.lib.chalmers.se/records/fulltext/202020/202020.pdf

OL 30