Applying multi-objective optimization to a ventilation duct for an automotive vehicle

Objectives 5
Hopefully, a successful optimization of a portion of the entire system can allow for extension to
further areas encompassing the left duct and the front pipes or eventually the whole system. That
is, considering that the process has proved its validity and perceived as useful.
Adopting a real world design problem offers the advantage of having project geometries both
as a starting point and for constraints definition. Furthermore, comparison of the obtained
results with the original design is also possible. 
Nonetheless, instead of optimizing the existing ventilation duct, we started with a simplified
geometrical model. This approach is justified by the fact that we are considering the early
phases of a project where definitive geometries aren’t yet defined. Furthermore, our mission is
to provide feasibility and design indications, not yet a fully defined ventilation duct.
Consequently, real project geometries have been limited to boundaries control (contact or
interferences with the surrounding elements) and geometrical interfaces (inlet and outlet
shapes).
1.3 Objectives
The objective of the study is to apply optimization techniques to the right duct of the front
ventilation system which is supposed to provide sufficient air flow through the outlet, by
minimizing the pressure loss and keeping the noise levels to an acceptable minimum.
In a more general formulation the optimization task can be defined as a problem where
design variables are altered with the aim of reaching objectives while satisfying necessary
constraints. Schematically: