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FSI Analysis of a Hydroelectric Power Plant

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Hydroelectric power plants are used for economic and environmentally friendly electric power generation all around the world. One of the technical challenges in the design of such structures is to consider the fluid-structure interaction effects. For example, when the water pressure fluctuates as it passes through the fluid passage and the hydraulic turbine, it creates a pulsatile loading that causes vibration of the powerhouse structure.

FSI Analysis of a Hydroelectric Power Plant_1

FSI Analysis of a Hydroelectric Power Plant_2Displacement (magnified)

In this blog post, we present some results of a study dealing with the vibrations of a powerhouse structure due to the fluid-structure interaction, obtained using ADINA. Figure 1 depicts a schematic of the powerhouse structure, the fluid passage, and the turbine. Figure 2 shows the finite element model of the coupled system. The nonlinear transient response of the coupled system was solved using 3000 implicit integration time steps, with a time step of 0.002 seconds (see Ref).

The fluid was modeled as a Navier-Stokes fluid. The turbulent behavior of the fluid was modeled using the shear stress transport (SST) model. The sliding mesh boundary condition was used to incorporate the large rotations of the turbine blades.

Schematic of the PowerhouseFigure 1: Schematic of the powerhouse

Finite Mesh ElementsFigure 2: Finite element mesh of the (a) powerhouse structure (b) turbine) (c) fluid

Velocity Vector PlotsFigure 3: Velocity vector plots (left) and nodal pressure contour plots (right) in the fluid at t = 4.80 s

Figure 3 shows velocity vector and pressure contour plots in the fluid model at the time = 4.80 s.

The movies at the top show the z-displacement contour plot of the powerhouse structure, and its time-dependent deformed shape due to the pressure loading from the fluid.

The movie below shows the contour plot of the pressure in the fluid.

Contour Plot of Pressure in Fluid

This case study shows some of the powerful capabilities of ADINA for solving practical fluid-structure interaction problems.

Reference 

 

  • S. Wei, L. Zhang, “Vibration analysis of hydropower house based on fluid-structure coupling numerical method””, Water Science and Engineering, 3(1): 75-84, 2010

Keywords:
Hydroelectric power, fluid-structure interaction, FSI, hydraulic turbine, draft tube, powerhouse structure, vibration, sliding mesh, shear stress transport (SST), transient dynamic

Courtesy of Shu-he Wei and Liao-jun Zhang, College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, P.R. China

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