Large eddy simulation of turbulent flow in a true 3D Francis hydro turbine passage with dynamical fluid–structure interaction

2007 ◽  
Vol 54 (5) ◽  
pp. 517-541 ◽  
Author(s):  
Lixiang Zhang ◽  
Yakun Guo ◽  
Wenquan Wang
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Fluid Structure Interaction ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Hydro Turbine ◽  
Eddy Simulation ◽  
Large Eddy

Fluid-structure interaction study of the supersonic parachute using large-eddy simulation

2018 ◽  
Vol 35 (1) ◽  
pp. 157-168 ◽  
Author(s):  
Xue Yang ◽  
Li Yu ◽  
Xiao-Shun Zhao
Keyword(s):  
Large Eddy Simulation ◽  
Penalty Function ◽  
Fluid Structure Interaction ◽  
Content Type ◽  
Contact Algorithm ◽  
Structure Interaction ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Volume Problem ◽  
Contact Domain

Purpose The purpose of this study is to model the dynamic characteristics of an opened supersonic disk-gap-band parachute. Design/methodology/approach A fluid-structure interaction (FSI) method with body-fitted mesh is used to simulate the supersonic parachute. The compressible flow is modeled using large-eddy simulation (LES). A contact algorithm based on the penalty function with a virtual contact domain is proposed to solve the negative volume problem of the body-fitted mesh. Automatic unstructured mesh generation and automatic mesh moving schemes are used to handle complex deformations of the canopy. Findings The opened disk-gap-band parachute is simulated using Mach 2.0, and the simulation results fit well with the wind tunnel test data. It is found that the LES model can successfully predict large-scale turbulent vortex in the flow. This study also demonstrates the capability of the present FSI method as a tool to predict shock oscillation and breathing phenomenon of the canopy. Originality/value The contact algorithm based on the penalty function with a virtual contact domain is proposed for the first time. This methodology can be used to solve the negative volume problem of the dynamic mesh in the flow field.

LES OF TURBULENT FLOW IN 3D SKEW BLADE PASSAGE OF A REACTING HYDRO TURBINE

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1487-1490 ◽  
Author(s):  
LIXIANG ZHANG ◽  
WENQUAN WANG
Keyword(s):  
Numerical Simulation ◽  
Large Eddy Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Flow ◽  
Blade Passage ◽  
Hydro Turbine ◽  
Eddy Simulation ◽  
Spatial And Temporal Distributions ◽  
Large Eddy

The turbulent flow in a reacting hydro turbine was simulated with large eddy simulation (LES) to investigate the spatial and temporal distributions of the turbulence in a 3D skew blade passage. The simulations show that the intrinsic features are quite complicated. LES can capture the details of the structures, and the results are generally agreeable with those by direct numerical simulation.

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