This research focused on the numerical simulation of fluid-solid conjugate heat transfer in natural convection conditions, specifically addressing an independently designed and manufactured LED light. Employing Computational Fluid Dynamics (CFD) methods, the study aimed to optimize the multi-scheme design of the heat dissipation of the light in underwater environments. Validation efforts involved water tank testing, demonstrating 2.9% average relative error between simulated and measured temperatures under thermal equilibrium. Furthermore, the study delved into predicting the inner operating temperature of the LED light in large underwater spaces. Comparative analysis of temperature variations under varying seawater velocities and fin orientation provided valuable insights, guiding the refinement of the heat dissipation of the light for enhanced performance in specific underwater contexts.
