@article{01J6PVASW6VKSEKPA022T3T9KE,
  abstract     = {{We present a hybrid RANS-LES technique (Reynolds Averaged Navier Stokes, Large Eddy Simulation), coupled with an algebraic transition model. The hybrid technique belongs to the class of DDES (Delayed Detached Eddy Simulation). The target applications are flows through gas turbine cascades. The flow approaching a blade and the flow near a blade surface are represented by URANS (unsteady RANS), while boundary layers that separate without reattachment and wakes are captured by LES. The hybridisation is realised by length-scale substitution in the destruction term of the k-equation and the eddy viscosity expression. Near-wall zones are shielded with RANS-protection functions, preventing activation of LES in the flow near the blade surfaces.
Results are shown for flows through a linear turbine cascade (T106A) with two isentropic chord-based Reynolds numbers, 1.0·105 and 1.6·105, combined with two levels of free stream turbulence, Tu = 0.5 % and Tu = 3.2 or 4.0 %. The combinations cover all transition types: laminar open separation with transition in the wake, laminar closed separation with transition in separated state, reattachment and formation of a bubble, and bypass transition in attached boundary layer state. The DDES model produces improved results of wake losses, compared to 2D RANS and 3D URANS.}},
  author       = {{Kubacki, Slawomir and Dick, Erik}},
  issn         = {{2518-0991}},
  journal      = {{ERCOFTAC BULLETIN}},
  keywords     = {{Fluid Mechanics,Transition model}},
  language     = {{eng}},
  pages        = {{42--47}},
  title        = {{Coupling of hybrid RANS-LES and a transition model for simulation of flow in a linear turbine cascade}},
  volume       = {{138}},
  year         = {{2024}},
}