Abstract:
Most flows of practical importance are governed by viscous near-wall phenomena
leading to separation and subsequent transition to a turbulent state. This type
of problem currently poses one of the greatest challenges for computational methods
because its characteristics covers a wide range of physical processes that often place
contradictory requirements on the numerics employed.
This thesis seeks to investigate the physics of complex, separated flows pertinent to
aeronautical engineering and to assess the performance of variants of the Implicit
Large-Eddy Simulation approach in predicting this type of problem realistically. For
this purpose, different numerical solution strategies based on high-resolution methods,
distinguished by their order of accuracy, are used in precursor simulations and one
selected approach is applied to a fully three-dimensional wing flow.
In order to isolate the development from laminar to turbulent flow after separation has
occurred, the prototype Taylor-Green Vortex is considered. Here, the behaviour of the
numerical schemes during the linear, non-linear and fully turbulent stages in the flow
evolution is tested for different grid sizes. It is found that the resolution power and
the likelihood of symmetry breaking is increasing with the order of accuracy of the
numerical method. These two properties allow the flow to develop more realistically
on coarse grids if higher order schemes are employed.
In the next step, flow separation from a gently curved surface is included. The fundamental
study of a statistically two-dimensional channel flow with hill-type constrictions
demonstrates the basic applicability of ILES to problems featuring massive separation.
Without specific wall-treatment, high-resolution methods can improve prediction
of the detachment location when compared to classical Large-Eddy Simulations.
Finally, an ILES simulation of three-dimensional flow over a swept wing geometry at
moderate angle of incidence is presented. The results are in excellent agreement with
experiment in the fully separated and turbulent region and they are more accurate than
a classical hybrid RANS/LES approach, using a grid twice the size, over the majority
of the wing. This outcome will probably settle the dispute that has erupted in the past
over the applicability of ILES to complex, wall-bounded flows.
