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Adjoint-based air duct topology optimisation

Ida Trangsrud
Göteborg : Chalmers tekniska högskola, 2018. Examensarbete - Institutionen för mekanik och maritima vetenskaper; 2018:43, 2018.
[Examensarbete på avancerad nivå]

This thesis was performed at the Climate Comfort department at Volvo Cars. The department works with the overall climate in the car, considering parts such as the ventilation system and defrosters. The aim of the thesis was to investigate the possibility and furthermore if it is bene cial to apply the software HELYX-Adjoint for creation of ducts for the climate system. HELYX-Adjoint is an adjoint CFD solver that, given an initial geometry, automatically produces an optimal shape. For this purpose, the software was applied on a manifold duct with two outlets. The objective of the optimisation process was to obtain as low pressure loss as possible between the inlet and both outlets. Di erent approaches and applications of the software were investigated, such as the dependence on speci c parameters, choice of objective function (the function that is to be optimised) as well as the in uence of the mesh size. The improvement of the resulting optimised design compared to the original geometry were 29 % and 27 % for the short and the long duct respectively. Compared to an already existing duct, the improvement were 34 % and 25 % for the two ducts. Hence, the performance of the optimised geometry in terms of loss in total pressure was better compared to both the original geometry and the already existing duct. The overall conclusion is that the use of HELYX-Adjoint for creation of ducts for the climate system has large potential.

Nyckelord: adjoint, optimisation, CFD, HELYX

Publikationen registrerades 2018-08-14. Den ändrades senast 2018-09-20

CPL ID: 255695

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