Abstract
Abstract The successful application of eddy resolving simulations to most areas of a modern gas turbine aeroengine is considered. A coherent modeling framework is presented to address coupling challenges. A flow classification is also given. The extensive results presented are shown to be promising but many challenges remain. In the short term, the use of eddy resolving simulations should see greater use in Reynolds-averaged Navier–Stokes (RANS) and lower-order model calibration/development—this is starting to happen already. Ideally, in the near future, RANS, large eddy simulation (LES), and test should work in harmony. It is advocated that currently, certain costly engineering design problems can be avoided or understood using scale resolving simulations.
Highlights
This paper largely recalls a groups experience of using unsteady/eddy resolving simulations to predict the flow in different components of gas turbine engines
The results shown here are from Scillitoe et al [22], having a free stream turbulence intensity of 1.5% and a grid of circa 10 million cells
RANS, LES & test should work in harmony
Summary
This paper largely recalls a groups experience of using unsteady/eddy resolving simulations to predict the flow in different components of gas turbine engines. These are predominantly Reynolds number independent, wake type flows These include ribbed passages (as found inside high pressure turbine blades), cut back trailing edges - CBTE (see later), propulsive jets and avionics. The Reynolds numbers are moderate enough that LES (or Implicit LES – ILES) can be exploited with tolerable grid densities Such systems potentially include low pressure turbine blades, some high-pressure compressor drum conditions, intakes in crosswinds and hydrodynamic journal bearings. The boundary layer flow has complex transitional elements This makes wall resolved LES or DNS essential and the combination of this with the substantial Reynolds number makes simulations expensive. Class (D) flows are high Reynolds number, where one would like to exploit hybrid RANS-LES or perhaps WMLES This approach will be limited in effectivity. Their surfaces move at high velocity into the page giving a high Reynolds number boundary layer
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