Unsteady flow dynamics in turbine rim seals are known to be complex and attempts
accurately to predict the interaction of the mainstream flow with the secondary air system
cooling flows using computational fluid dynamics (CFD) with Reynolds-averaged Navier–
Stokes (RANS) turbulence models have proved difficult. In particular, published results from
RANS models have over-predicted the sealing effectiveness of the rim seal, although their
use in this context continues to be common. Previous studies have ascribed this discrepancy …

Unsteady flow dynamics in turbine rim seals are known to be complex and attempts
accurately to predict the interaction of the mainstream flow with the secondary air system
cooling flows using CFD with RANS turbulence models have proved difficult. In particular,
published results from RANS models have over-predicted the sealing effectiveness of the
rim seal, although their use in this context continues to be common. Previous authors have
ascribed this discrepancy to the failure to model flow structures with a scale greater than can …