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FSI Analysis of a Hydroelectric Power Plant

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. Displacement (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. Figure 1: Schematic of the powerhouse Figure 2: Finite element mesh of the (a) powerhouse structure

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Simulation of Buckling of Bridge Braces — the San Francisco-Oakland Bay Bridge

The California Department of Transportation (Caltrans) initiated the California Toll Bridge Seismic Retrofit Program to determine the vulnerability of California’s major toll bridges to damage associated with strong earthquakes and to design retrofits to improve seismic safety. ADINA was selected by Caltrans and contractors in this Retrofit Program. A very important part in the bridge analyses is the modeling of the braces in the bridge structures (a photograph of the San Francisco-Oakland Bay Bridge is shown below). Typical braces, which are laced built up members with rivets, were tested in the laboratory. Since there are many such braces in each bridge structure, it was necessary to establish a simple and effective finite element model of a typical brace. In the following we briefly describe, courtesy of SC Solutions, California, the modeling and verification of the behavior of these braces using the ADINA moment-curvature beam elements. This ADINA capability has proven to be of major importance for the nonlinear analyses of bridges. For the verification study, braces subjected to axial and flexural stresses were modeled in detail with shell elements, and then simplified with the moment-curvature beam elements in ADINA. The following figures show that a drastic reduction in degrees of

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Simulation of Broken Dam

The animation below is a simulation of the flow of water when a dam is broken. The simulation demonstrates the use of the VOF method, which will be available in version 8.1 of ADINA.

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Helmet Impact Analysis

MET S.p.A. is a leading sports helmet manufacturer based in Talamona, Italy. Engineers at MET have used ADINA successfully to analyze their new helmet design. Depicted in the above animation are the stress contours of the helmet in their simulation of a head with a helmet impacting an anvil at a velocity of 4.57 meters/second. The objective is to ensure that the helmet provides adequate protection for the head; in particular, the deceleration on the head must not exceed 250g.   Figure 1 shows the setup for the simulation and the laboratory test. In the past, engineers at MET had to rely on results obtained from actual impact tests carried out on prototype models in the laboratory to evaluate the performance of a new helmet design. Now with the use of ADINA, the engineers are able to gain better insight into how the helmet functions, e.g., the clearance distance between the head and the anvil can be obtained easily from the simulation results. Comparison of the simulation and laboratory test results (in Figure 2 below) shows very good agreement.    

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Study of Pipe Break in a Nuclear Reactor

Sweden has 10 nuclear power reactors providing nearly half of its electricity. Due to the current concern for optimal energy sources, many Swedes consider nuclear power a good option when competitiveness and environmental impact are taken into account. As nuclear power carries the risk of toxic pollution, the safe, efficient operation and maintenance of the nuclear reactors is very important.

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Customer Experiences with the New ADINA Sparse Solver

In modern earthquake engineering, design for seismic isolation has become increasingly important for the prevention of devastating damage in a major earthquake. One effective and practical method for seismic isolation is the use of friction pendulum bearings, of which many may be used in a bridge structure.

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