Near-wall model for oil-jet cooling of an electric motor

The development of electric vehicles has been accompanied by technological advances resulting in more compact and higher-speed motors (rpm), which create significant heat fluxes within reduced volumes. This leads to the emergence of critical zones in terms of material integrity. Direct cooling by oil jets applied to localized regions appears to be a promising solution to this issue, but remains challenging to simulate numerically. Indeed, the resulting flows are characterized by high Prandtl numbers and, consequently, a very thin thermal boundary layer, particularly in the jet impingement zone, where cooling is most effective. As a result, in Computational Fluid Dynamics, explicitly resolving this boundary layer in large-scale geometries requires very fine meshes and often prohibitive computation costs.