Modeling of 3-D losses and deviations in a throughflow analysis tool

Simon, Jean-Francois; Léonard, Olivier

doi:10.1007/s11630-007-0208-x

Cited by 25 publications

(8 citation statements)

References 10 publications

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“…Hence, this approach supplies the only two ultimate geometrical inputs that are required by the IBMfg approach: the blade local angle, and the thickness of the blade normal to the mean flow direction in the relative frame. Aerodynamic losses arising from the full blade geometry need to be modeled, using for example, standard turbomachinery loss models that occur in low order throughflow models (see (Simon and Léonard 2007)). Figure 7 shows the approach applied to a basic aerofoil.…”

Section: Immersed Boundary Methods With Optional Filtered Geometry (Ibmfg)mentioning

confidence: 99%

Efficient preprocessing of complex geometries for CFD simulations

Ali

Tyacke

Watson

et al. 2019

International Journal of Computational Fluid Dynamics

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Preprocessing remains one the main bottlenecks in the Computational Fluid Dynamics (CFD) simulations of flows involving complex geometries as advances in the algorithm development, turbulence modeling and parallel computing are made. To this end, two approaches are presented here to efficiently deal with complex geometries in order to reduce the preprocessing time and manual effort. First, a hybrid blocking approach, combining the medial axis based method with level set iso-surface is presented to aid the block topology generation for subsequent structured meshing of complex 3D external flow domains. Secondly, a hierarchical geometry handling approach is demonstrated which makes use of the lower order modeling, overset meshes and zonal blocking for efficient preprocessing. Typical external aerodynamics cases have been showcased to describe how such techniques can be used to address modern challenges in the preparation of complex geometries for flow simulations.

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Section: Immersed Boundary Methods With Optional Filtered Geometry (Ibmfg)mentioning

confidence: 99%

Efficient preprocessing of complex geometries for CFD simulations

Ali

Tyacke

Watson

et al. 2019

International Journal of Computational Fluid Dynamics

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“…Pacciani et al 19,20 studied the 3D flow features modeling issues in the time-marching throughflow model. Further developments lead to Navier-Stokesbased throughflow codes 21,22 and progresses in modeling the effects of 3D loss. In these solvers, the use of classical loss models must be carefully addressed in order to avoid accounting for the same losses twice.…”

Section: Introductionmentioning

confidence: 99%

Time-marching throughflow analysis of multistage axial compressors based on a novel inviscid blade force model

Yang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part G:

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A time-marching throughflow method for the off-design performance analysis of axial compressors is described. The method is based on the Euler equations, and a new inviscid blade force model is proposed in order to achieve desired flow deflection. The flow discontinuity problems at the leading and trailing edges are tackled by automatic correction of blade mean surface using cubic spline interpolation. Empirical loss models have been integrated into the throughflow model in order to simulate the viscous force effects in the real three-dimensional flow. Two test cases have been presented to validate the throughflow model, including the transonic fan rotor – NASA Rotor 67 working at a near-peak-efficiency point and a 1.5-stage high-speed axial compressor with inlet guide vane operating at 68% nominal speed. Reasonable flow parameters distributions have been obtained in the Rotor 67 fan calculating results, and accurate overall performance characteristics have also been predicted at the strong off-design condition for the 1.5-stage axial compressor. The CPU time of both cases cost less than one minute at one operating point. The results indicate that the developed time-marching throughflow model is effective and efficient in the turbomachinery performance analysis.

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“…[1,13]. These solvers use finite volume formulation for the circumferentially averaged three-dimensional transport equations unlike to their predecessors, which were based on streamline curvature or stream function methods and which were not able to handle precisely transonic flow.…”

Section: Introductionmentioning

confidence: 99%