In this paper, a liquid-solid coupling simulation of circulated coolant fluid and solid body of an internal combustion engine is carried out using AVL-FIRE software. Contrary to the previous numerical studies, unsteady simulations are performed in the present work. A validation test against experimental data is examined using BDL and Chen correlations. The results show that two correlations give reasonable results for the used setup at engine operating temperature. The effect of pressure, heat transfer coefficient in water jacket and temperature distribution in block and cylinder head is studied. In addition, the influence of engine shutdown on temperature distribution in water jacket, block and cylinder head is investigated. The results demonstrate that the boiling heat flux is zero until the shutdown time, then increases suddenly and reaches a maximum value between the two cylinders.
