An overset grid method for large eddy simulation of turbomachinery stages

2014 ◽  
Vol 274 ◽  
pp. 333-355 ◽  
Author(s):  
Gaofeng Wang ◽  
Florent Duchaine ◽  
Dimitrios Papadogiannis ◽  
Ignacio Duran ◽  
Stéphane Moreau ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Grid Method ◽  
Overset Grid ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Overset Grid Method

Application of an Overset Grid Method to the Large Eddy Simulation of a High-Speed Multistage Axial Compressor

2016 ◽  
Author(s):  
Jerome de Laborderie ◽  
Florent Duchaine ◽  
Olivier Vermorel ◽  
Laurent Gicquel ◽  
Stephane Moreau
Keyword(s):  
Large Eddy Simulation ◽  
High Speed ◽  
Axial Compressor ◽  
Grid Method ◽  
Overset Grid ◽  
Eddy Simulation ◽  
Radial Profiles ◽  
Large Eddy ◽  
Overset Grid Method ◽  
Aerodynamic Performances

The present study aims at evaluating the feasibility and the accuracy of the Large-Eddy Simulation of an actual high-pressure multistage compressor, performed with the TurboAVBP numerical method. TurboAVBP relies on the coupling of several domains via an overset grid method. The latter is demonstrated to keep the order of accuracy of the numerical scheme across six successive rotor-stator interfaces. The simulated configuration corresponds to the 3.5 stage axial compressor CREATE. Three unstructured grids of CREATE, with different resolutions, are generated. They contain 37 blades, the actual rotor tip clearances and a recirculating cavity. The predictions of the global aerodynamic performances and of the radial profiles are found to agree well with experimental data. The analysis of the flow shows that the finest grid exhibits the turbulent flow structures expected in such a configuration, including the blade and vane wakes and the rotor tip leakage vortices.

Overset Grid Method for Large Eddy Simulation of Turbulent Flows Around Bluff Bodies

2007 ◽  
Author(s):  
Y. Itoh ◽  
T. Tamura
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flows ◽  
Grid Method ◽  
Side Surface ◽  
Mass Conservation ◽  
Overset Grid ◽  
Turbulence Structures ◽  
Eddy Simulation ◽  
Side Ratio ◽  
Large Eddy

The large eddy simulation of turbulent flow around a rectangular cylinder with side ratios of 1.0, 2.0, 2.67, and 3.0 at Re = 22000, is carried out using an overset grid system. In order to improve mass conservation along the boundary of computational domains, numerical procedures are proposed. The aerodynamic forces of rectangular cylinders can be predicted numerically. Details of pressure distributions along the side surface of the cylinder and turbulence structures in the wake is discussed, because there is a difference in accuracy of computational results in terms of the side ratio.

Large Eddy Simulation of Compressible Flows Using a Non-Body Conformal Grid Method

2006 ◽  
Author(s):  
Wen Wang ◽  
Richard H. Pletcher
Keyword(s):  
Large Eddy Simulation ◽  
Compressible Flows ◽  
Time Derivative ◽  
Grid Method ◽  
Reynolds Numbers ◽  
Second Order ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Turbulent Statistics ◽  
Large Eddy

Large eddy simulations of turbulent flow around complex geometries are presented. A non-body conformal grid method is developed and combined into the compressible Navier-Stokes solver. Time derivative preconditioning is used to deal with the low Mach number situation. A second-order accurate finite volume formulation is chosen and the implicit LU-SGS scheme is implemented. A localized dynamic subgrid-scale (SGS) model is used to evaluate the subgrid-scale stresses and heat fluxes. A second-order bilinear (for 2D situation) or trilinear (for 3D situation) interpolation method is employed to satisfy the no-slip boundary condition on the immersed boundary. The method is validated for flow past a circular cylinder with different Reynolds numbers. Large eddy simulation of pipe flow with high Reynolds numbers using this non-body conformal grid method is conducted and the turbulent statistics are consistent with body-fitted grid method results. Furthermore, the LES simulation results with non-body conformal grids for channel flow containing a rod bundle are presented.

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