A Viscous—Inviscid Interaction Method for Computing Unsteady Transonic Separation

Abstract

In steady separated flows, computing capability at high Reynolds number is now developed either with direct solvers, usually simulating the Navier-Stokes (NS) and Thin-layer Navier-Stokes (TNS) equations [402, 431], or with indirect solvers, defined as Viscous-Inviscid interaction Solvers (VIS) [273, 432]. As compared to the direct NS-TNS methods, the indirect VIS methods differ simply in splitting the numerical treatment into viscous plus inviscid-like plus interaction solvers. This splitting is intended primarily to generalize the well-conditioned numerical methods designed for boundary layers, which are efficient and accurate at high Reynolds numbers, and to recover the boundary-layer technique as a means of numerical conditioning for solving the higher-order equations.