### Computational fluid dynamics investigation and multi-objective optimization of an engine
air-cooling system using a genetic algorithm

Abstract

In this study, computational fluid dynamics (CFD) analysis is utilized in order to determine
the convective heat transfer coefficient of an engine air-cooling system in different air velocity
conditions. Various models with different geometric configurations are considered. Based on the CFD
results, two formulas are proposed to approximate the values of convective heat transfer coefficients
in zero and non-zero air velocities. Finally, two conflicting objective functions including volume
of the required material for construction of the finned cylinder and heat release per unit temperature
difference are considered. Multi-objective optimization using genetic algorithm is utilized, which
generates a multiple set of solutions, each of which is a trade-off between two objectives. The user
can select each of the optimal geometric configurations based on the project's requirements. In other
words, considering the desired thermal design, designer is able to find the minimum volume of the
required material for construction of the finned cylinder, which in turn leads to the least possible
capital cost.