Numerical and Experimental Evaluation of Sloshing Wave Force Caused by Dynamic Loads in Liquid Tanks

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Mohammad Mahdi Kabiri ◽  
Mohammad Reza Nikoomanesh ◽  
Pouya Nouraei Danesh ◽  
Mohammad Ali Goudarzi
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Wave Force ◽  
Full Scale ◽  
Shaking Table ◽  
Small Scale ◽  
Solid Boundary ◽  
Storage Tanks ◽  
Wave Impact ◽  
Liquid Storage

Proper evaluation of forces exerted on a solid boundary by liquid sloshing is difficult. If the free board in a liquid storage tank is insufficient, the sloshing waves caused by seismic excitation will collide with the tank roof and may cause major damage. The current study investigated the sloshing wave impact force (SWIF) in full-scale liquid storage tanks using numerical simulation based on the lattice Boltzmann method (LBM). Several shaking table tests have been conducted on a small-scale rectangular tank to validate the numerical model. The results of a standard dam break test have been used to express the validity of the proposed numerical model. This comparison confirms the validity of the numerical strategy for simulating the effect of sloshing. After validating the numerical model, it has been applied to a practical parametric study of SWIF in full-scale liquid tanks. The results of numerical simulation indicate that the simplified method recommended by related codes and standards for calculating SWIF in liquid tanks significantly underestimates the sloshing force. This confirms that the dynamic nature of sloshing should be considered in the design process of liquid storage tanks.

Nonlinear Finite Element Analysis of Unanchored Steel Liquid Storage Tanks Subjected to Seismic Loadings

2017 ◽  
Author(s):  
Hoang Nam Phan ◽  
Fabrizio Paolacci ◽  
Philippe Mongabure
Keyword(s):  
Finite Element ◽  
Free Surface ◽  
Power Plants ◽  
Nonlinear Dynamic Analysis ◽  
Analysis Procedure ◽  
Nonlinear Finite Element ◽  
Shaking Table ◽  
Storage Tanks ◽  
Liquid Storage ◽  
Seismic Loadings

Steel liquid storage tanks are widely used in industries and nuclear power plants. Damage in tanks may cause a loss of containment, which could result in serious economic and environmental consequences. For the purpose of the earthquake-resistant design of tanks, it is important to use a rational and reliable nonlinear dynamic analysis procedure. The analysis procedure should be capable of evaluating not only the comprehensive seismic responses but also the damage states of tank components under artificial or real earthquakes. The present paper deals with the nonlinear finite element modeling of steel liquid storage tanks subjected to seismic loadings. A reduce-scale unanchored steel liquid storage tank with the broad configuration from a shaking stable test (i.e., the INDUSE-2-safety project) is selected for this study. The fluid-structure interaction problem of the tank-liquid system is analyzed using the Abaqus software with an explicit time integration approach. In particular, the steel tank is modeled based on a Lagrangian formulation, while an Arbitrary Lagrangian-Eulerian adaptive mesh is used in the liquid domain to permit large deformations of the free surface sloshing. The finite element results in terms of the sloshing of the liquid free surface and the uplift response of the base plate are evaluated and compared with the experimental data that is obtained from the shaking table test for the tank under the INDUSE-2-safety project.

Dynamic Buckling Simulation of Cylindrical Liquid Storage Tanks Subjected to Seismic Motions

2010 ◽  
Author(s):  
Akira Maekawa ◽  
Katsuhisa Fujita
Keyword(s):  
Numerical Simulation ◽  
Seismic Response ◽  
Large Deformation ◽  
Three Dimensional ◽  
Mesh Size ◽  
Buckling Analysis ◽  
Dynamic Buckling ◽  
Storage Tanks ◽  
Analysis Method ◽  
Liquid Storage

A three-dimensional and elastic-plastic dynamic buckling analysis method that takes into consideration fluid-structure coupling and large deformation is proposed in order to accurately simulate the seismic response of cylindrical liquid storage tanks. The results of a dynamic buckling experiment of a tank using seismic motions closely match those of numerical simulation by the proposed method. The mesh size of the analytical model greatly influences the buckling analysis results. Optimization of the size is also discussed.

Development of Experimental and Computational Procedures for Nuclear Power Plant Component Testing Under Flooding Conditions

2017 ◽  
Author(s):  
Antonio Tahhan ◽  
Cody Muchmore ◽  
Larinda Nichols ◽  
Alison Wells ◽  
Gregory Roberts ◽  
...  
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Full Scale ◽  
Nuclear Industry ◽  
Small Scale ◽  
Wave Impact ◽  
Plant Component ◽  
Component Testing ◽  
Water Rise

Idaho State University (ISU), with support from Idaho National Laboratory, is actively engaged in enhancing nuclear power plant risk modeling. The ISU team is significantly increasing the understanding of non-containment, nuclear power plant component performance under flooding conditions. The work involves experimentation activities and development of mathematical models, using data from component flooding experiments. The research consists in developing experimentation procedures that comprised small scale component testing, followed by simple and then complex full scale component testing. The research is taking place in the Component Flooding Evaluation Laboratory (CFEL). Tests in CFEL will include water rise, spray, and wave impact experiments on passive and active components. Initial development work focused on small scale components, radios and simulated doors, that served as a low-risk and low-cost proof-of-concept options. Following these tests, full-scale component tests were performed in the Portal Evaluation Tank (PET). The PET is a semi-cylindrical 7500-1 capacity steel tank, with an opening to the environment of 2.4 m. × 2.4 m. The opening allows installation of doors, feedthroughs, pipes, or other components. The first set of experiments with the PET were conducted in 2016 using hollow doors subjected to a water rise scenario. Data collected during the door tests is being analyzed using Bayesian regression methods to determine the parameters of influence and inform future experiments. A practical method of simulating full scale wave impacts on components and structures is also being researched to further enhance CFEL capabilities. Early on, the team determined full scale wave impacts could not be simulated using traditional wave flumes or pools; therefore, closed conduit flow is under consideration. Computational fluid dynamics software is being used to simulate fluid velocities associated with tsunami waves of heights up to 6-m, and to design a wave impact simulation device capable of accurately recreating a near vertical wave section with variable height and fluid velocity. The component flooding simulation activities associated with this project involve use of smoothed particle dynamics codes. These particle-based simulation methods do not require a mesh to be applied to the fluid, which allows for more natural flows to be simulated. Finally, CFEL can be described as a pioneering element, comprised of several ongoing research and experimental projects, that are vital to the development of risk analysis methods for the nuclear industry.

scholarly journals Numerical Simulation of Flood Inundation in a Small-Scale Coastal Urban Area Due to Intense Rainfall and Poor Inner Drainage

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2269
Author(s):  
Son ◽  
Jeong
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Urban Area ◽  
Heavy Rainfall ◽  
Small Scale ◽  
Target Area ◽  
Flood Inundation ◽  
Intense Rainfall ◽  
Tidal Level ◽  
Finite Volume Model

: This study presents the numerical simulation and analysis of the characteristics of the flood inundation in a small-scale coastal urban area due to the intense rainfall and poor inner drainage from the tidal level rise occurring during a typhoon. The employed numerical model is a two-dimensional finite volume model with a well-balanced HLLC (Harten–Lax–Van Leer contact) scheme. The target area is a coastal urban area downstream of the Gohyun river; which is located in Geoje City of Kyungsangnam Province, Korea. This area was significantly damaged by flood inundation due to the heavy rainfall and significant increase in the tidal level during Typhoon “Maemi”, which occurred in September 2003. The numerical model used in this study is verified using the flood inundation traces observed in the selected urban area. Moreover; the characteristics of the flood inundation based on the change in the river inflow due to the increase or decrease in the intensity of the possible heavy rainfall that may occur in the future are simulated and analyzed.

scholarly journals Prediction of Seabed Scour Induced by Full-Scale Darrieus-Type Tidal Current Turbine

2019 ◽  
Vol 7 (10) ◽  
pp. 342 ◽  
Author(s):  
Sun ◽  
Lam ◽  
Dai ◽  
Hamill
Keyword(s):  
Experimental Data ◽  
Numerical Model ◽  
Tidal Current ◽  
Full Scale ◽  
Scale Model ◽  
Small Scale ◽  
Scour Depth ◽  
Equilibrium Scour Depth ◽  
Tidal Current Turbine ◽  
Current Turbine

Scour induced by a Darrieus-type tidal current turbine was investigated by using a joint numerical and experimental method with emphasis on the scour process of a full-scale turbine. This work proposes a new numerical method to estimate turbine scour developments, followed by model validation through experimental data in the initial stage. The small-scale numerical model was further extended to a full-scale model for the prediction of turbine scour. The numerical model consists of (1) k-ω turbulence closure, (2) a sediment transport model, and (3) a sediment slide model. The transient-state model was coupled with a morphologic model to calculate scour development. A dynamic mesh updating technique was implemented, enabling the autoupdate of data for the grid nodes of the seabed at each time step. Comparisons between the numerical results and the experimental measurements showed that the proposed model was able to capture the main features of the scour process. However, the numerical model underestimated about 15%–20% of the equilibrium scour depth than experimental data. An investigation of the temporal and spatial development of seabed scour around a full-scale Darrieus-type tidal current turbine is demonstrated. This work concludes that the proposed numerical model can effectively predict the scour process of tidal current turbines, and the rotating rotor has a significant impact on the equilibrium scour depth for full-scale turbines.

Removal of VOCs emitted from p-xylene liquid storage tanks by a full-scale compost biofilter

2015 ◽  
Vol 93 ◽  
pp. 218-226 ◽  
Author(s):  
Shenteng Chang ◽  
Chungsying Lu ◽  
Hsiaoyun Huang ◽  
Shihchieh Hsu
Keyword(s):  
Full Scale ◽  
Storage Tanks ◽  
Liquid Storage

New Development of Control Method of Shaking Table With Bi-Linear Structures

2002 ◽  
Author(s):  
Nobuyuki Shimizu ◽  
Yuichirou Shinohara ◽  
Eiji Sato
Keyword(s):  
Control Method ◽  
Earth Science ◽  
Full Scale ◽  
Lessons Learned ◽  
Shaking Table ◽  
Control Synthesis ◽  
Small Scale ◽  
Control Procedure ◽  
Test Model ◽  
And Control

The Hanshin-Awaji earthquake disaster occurred in Kobe area of Japan in 1995. Considering the lessons learned from the disaster of this earthquake, Japanese government has decided to construct a three-dimensional Full Scale Earthquake Testing Facility. It is now being constructed under the supervision of the National Research Institute for Earth Science and Disaster Prevention (NIED). The purpose of this shaking table is to conduct fracturing tests rather than elastic vibration tests for full scale structures. In the tests, the classical operation and control procedure for shaking table such as the trial excitation cannot be effectively applied to this shaking table, because dynamic property of the test structure varies with the progress of fracturing. Therefore, the development of a new operation and control method for the shaking table is the urgent research subject. In this study, firstly, we studied dynamic interaction behaviors of the shaking table with a bi-linear test model. Secondly, to reduce the interaction from the motion of the shaking table, the Minimal Control Synthesis (MCS) algorithm was newly introduced into the conventional control (CC) system. This paper deals with the efficacy of the MCS algorithm through the simulations and experiments using the two dimensional small scale shaking table with a bi-linear model structure.

Numerical Simulation of Shaking Table Tests on Full-Scale Stone Masonry Buildings

2015 ◽  
Vol 10 (2-3) ◽  
pp. 146-163 ◽  
Author(s):  
Andrea Penna ◽  
Ilaria Senaldi ◽  
Alessandro Galasco ◽  
Guido Magenes
Keyword(s):  
Numerical Simulation ◽  
Full Scale ◽  
Shaking Table ◽  
Stone Masonry ◽  
Masonry Buildings ◽  
Shaking Table Tests
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