Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session L16: CFD: LES, DNS, Hybrid RANS/LES I
8:00 AM–10:10 AM,
Monday, November 20, 2023
Room: 145A
Chair: Filipe Pereira, Los Alamos National Laboratory
Abstract: L16.00009 : Large Eddy Simulation of an Experimental Turbine Stage: Importance of Spatio-Temporal Resolution Requirements for Aerodynamic Performance Prediction
9:44 AM–9:57 AM
Presenter:
Leland M Tien
(Penn State Department of Mechanical Engineering)
Authors:
Leland M Tien
(Penn State Department of Mechanical Engineering)
Reid Berdanier
(Penn State Department of Mechanical Engineering)
Karen A Thole
(Penn State Department of Mechanical Engineering)
Robert F Kunz
(Penn State)
In 2023, wall-resolved LES remains challenging from a compute resource requirement standpoint for turbomachinery systems where chord Reynolds numbers in excess of 107 arise. Recent work [2] suggests that meshes and discretization accuracies less than conventionally deployed for LES - indeed RANS-like - can provide suitable accuracy for bulk performance parameters including stagnation pressure losses, loading and off-design operation. To explore this, we developed a sequence of meshes starting from RANS-like, (nominally 2x108 cells for the 3:2 vane:blade rotor-stator analysis). The meshes were refined locally based on the ratio of resolved to unresolved turbulence kinetic energy estimates, and surface and wake spectra. Through comparisons to available loading and loss profiles, and RANS simulations, we assess the quantitative accuracy of comparatively coarse LES modeling and make recommendations for practitioners who wish to pursue LES in these systems using conventional numerics.
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