Stabilizing the Jet: High-Fidelity Simulation of Advanced Impingement Cooling Using a Non-Conformal Discontinuous Galerkin Method

Abstract

In order to investigate jet impingement flows with complex geometry, we present an extension of a high-order Discontinuous Galerkin Spectral Element Method to non-conformal hexahedral meshes with 2-1 and 4-1 element connections. The convergence order of the method is verified and its suitability for the simulation of turbulent flows is validated using generic flows with known reference solutions. Using the new method, we obtain a new reference data set for a multi-jet impingement configuration consisting of 9 jets injected into a square channel. The present simulations include the plenum above the pipe inlet and it is shown how this improves the consistency with the experimentally investigated configuration in terms of jet velocity profile compared to previous simulations without the plenum. Due to the changed velocity profile, the downstream jets are deflected more strongly and the average Nusselt number is reduced while the unsteady dynamics remain qualitatively consistent. Finally, the effect of placing U-shaped flow guides on the hole plate is validated with particle image velocimetry data and their effect on the average and instantaneous heat transfer characteristics is discussed.