A low-dissipation monotonicity-preserving scheme for turbulent flows in hydraulic turbines

28th IAHR symposium on Hydraulic Machinery and Systems

Yang, L.^1 ; Nadarajah, S.^1

McGill University, 817 Sherbrooke Street West, Montreal

QC

H3A 0C3, Canada^1

关键词: Artificial dissipation;    Governing equations;    Reynolds shear stress;    Reynolds-averaged navier-stokes simulations;    SST turbulence models;    Turbulent kinetic energy;    Unsteady simulations;    Vortical flow structures;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/6/062010/pdf
DOI  :  10.1088/1755-1315/49/6/062010

来源: IOP

【 摘 要 】

The objective of this work is to improve the inherent dissipation of the numerical schemes under the framework of a Reynolds-averaged Navier-Stokes (RANS) simulation. The governing equations are solved by the finite volume method with the k-ω SST turbulence model. Instead of the van Albada limiter, a novel eddy-preserving limiter is employed in the MUSCL reconstructions to minimize the dissipation of the vortex. The eddy-preserving procedure inactivates the van Albada limiter in the swirl plane and reduces the artificial dissipation to better preserve vortical flow structures. Steady and unsteady simulations of turbulent flows in a straight channel and a straight asymmetric diffuser are demonstrated. Profiles of velocity, Reynolds shear stress and turbulent kinetic energy are presented and compared against large eddy simulation (LES) and/or experimental data. Finally, comparisons are made to demonstrate the capability of the eddy-preserving limiter scheme.