placed on the underlying flow physics and modelling capability. Rim seal flows play a
crucial role in controlling engine disc temperatures but represent a loss from the main
engine power cycle and are associated with spoiling losses in the turbine. Elementary
models that rely on empirical validation and are currently used in design do not
account for some of the known flow mechanisms, and prediction of sealing
performance with computational fluid dynamics (CFD) has proved challenging. CFD
and experimental studies have indicated important unsteady flow effects that explain
some of the differences identified in comparing predicted and measure sealing
effectiveness. This review reveals some consistency of investigations across a range
of configurations, with inertial waves in the rotating flow apparently interacting with
other flow mechanisms which include vane, blade and seal flow interactions, disc
pumping and cavity flows, shear layer and other instabilities, and turbulent mixing.
turbine rim seal. Configurations with an axisymmetric annulus flow and with nozzle guide vanes fitted (but without rotor blades) are considered. The passive scalar concentration solution and WMLES are validated against available data in the literature for uniform convection and a rotor-stator cavity flow. The WMLES approach is shown to be effective, giving significant improvements over an eddy viscosity turbulence model, in prediction of rim seal effectiveness compared to research rig measurements. WMLES requires considerably less computational time than wall-resolved LES, and has the potential for extension to engine conditions. All WMLES solutions show rotating inertial waves in the chute seal. Good agreement between WMLES and measurements for sealing effectiveness in the configuration without vanes is found. For cases with vanes fitted the WMLES simulation shows less ingestion than the measurements, and possible reasons are discussed.