This thesis focuses on the thermal optimization of an aircraft fuel tank, aiming to transform it from a passive storage component into an active contributor to the aircraft’s Thermal Management System. Traditionally, fuel tanks act as classical storage, where fuel is used as a coolant in heat exchange systems. The goal of this research is to redesign the tank's geometry to actively dissipate heat, making the tank a more effective part of the aircraft’s overall thermal regulation. This project runs parallel to another study focused on the structural optimization of the aircraft’s wing and fuel tank. While this thesis concentrates on thermal performance, the other project addresses weight reduction and material distribution using topological optimization.