Mesh convergence study for hydraulic turbine draft-tube

28th IAHR symposium on Hydraulic Machinery and Systems

Devals, C.^1 ; Vu, T.C.^2 ; Zhang, Y.^1 ; Dompierre, J.^1 ; Guibault, F.^1

École Polytechnique de Montréal, Montréal

QC, Canada^1

Andritz Hydro Canada Inc, Pointe-Claire

QC, Canada^2

关键词: Automatic mesh generators;    Computational flows;    Hydraulic turbine draft tube;    Mesh convergence;    Mesh independence;    Parametric study;    Solution accuracy;    Turbulence flow;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/8/082021/pdf
DOI  :  10.1088/1755-1315/49/8/082021

来源: IOP

【 摘 要 】

Computational flow analysis is an essential tool for hydraulic turbine designers. Grid generation is the first step in the flow analysis process. Grid quality and solution accuracy are strongly linked. Even though many studies have addressed the issue of mesh independence, there is still no definitive consensus on mesh best practices, and research on that topic is still needed. This paper presents a mesh convergence study for turbulence flow in hydraulic turbine draft- tubes which represents the most challenging turbine component for CFD predictions. The findings from this parametric study will be incorporated as mesh control rules in an in-house automatic mesh generator for turbine components.