Numerical simulation of unsteady natural convection in a simplified engine bay enclosure under soak conditions

Document Type

Conference Proceeding

Publication Date



Department of Mechanical Engineering-Engineering Mechanics


At the onset of soak, air and surface temperatures in an engine bay enclosure are elevated since temperature of heat sources are high while convective cooling is sharply reduced as a result of airflow being shut off from the inlet grilles of the vehicle leading to temperature spikes. Accurate simulation of this important thermal and flow regime that is natural convection driven, highly transient and complex is therefore very important. In this investigation, we simulate flow in the engine bay at the onset of soak with fixed thermal boundary conditions where the geometries representing the engine bay and components are simplified. Good agreement was observed with detailed experimental data available in references for both velocities and temperatures.

Publisher's Statement

Copyright © 2014 SAE International. Publisher’s version of record:

Publication Title

SAE Technical Papers