Comparison of Finite-Volume and Spectral/hp Methods for Large-Eddy Simulation of Combustor Port Flow

High-order accurate methods provide significant accuracy/cost benefits for well-resolved and geometrically simple scale-resolving turbulent flow simulations. However, the benefit on under-resolved unstructured grids complex industrial geometries is unclear. The purpose of this work to contribute understanding high-order schemes large-eddy simulations (LES) in practical applications. A crucial requirement a solver that supports hybrid grids. In context, accuracy cost spectral/ Nektar++ standard second-order finite-volume OpenFoam are systematically compared performing LES (with subgrid scale treatments) two configurations. first configuration Taylor–Green vortex, which shows fifth-order depends upon mesh type level under-resolution. second more represents dilution port flows gas turbine combustors. Specifically, consists crossflow radial jets impinging onto each other, providing rich variety features thus making case challenging. It found that, given cost, reproduces unsteady significantly better offers moderate improvements mean quantities. Moreover, results from finer costly simulation suggest similar accuracy, could be cheaper.