scholarly journals Seismic Response Characteristics of RCC Dams Considering Fluid-Structure Interaction of Dam-Reservoir System

2021 ◽  
Author(s):  
Khaled Ghaedi ◽  
Farzad Hejazi ◽  
Meisam Gordan ◽  
Ahad Javanmardi ◽  
Hamed Khatibi ◽  
...  
Keyword(s):  
Water Pressure ◽  
Fluid Structure Interaction ◽  
Hydrodynamic Pressure ◽  
Hydrodynamic Effect ◽  
Fe Model ◽  
Dam Reservoir ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Response Characteristics ◽  
Roller Compacted Concrete

In analysis of different types of dams, i.e. arch, gravity, rockfill and Roller Compacted Concrete (RCC) dams, the effect of hydrodynamic water pressure as an effective factor must seriously be taken into consideration. In present study, the hydrodynamic effect is precisely deliberated in RCC dams and compared to hydrostatic pressure effect. For this purpose, Kinta RCC dam in Malaysia is selected and 2D finite element (FE) model of the dam is performed. The Lagrangian approach is used to solve the dam-reservoir interaction, fluid–structure interaction (FSI), and in order to evaluate the crack pattern, Concrete Damaged Plasticity (CDP) model is implemented. Comparisons show that hydrodynamic pressure significantly changes the dam behaviour under seismic excitations. Moreover, the hydrodynamic effect modifies the deformation shape of the dam during the ground motions, however, it increases the magnitudes of the developed stresses causing more extensive tension crack damages mostly in the heel and upstream zones of the dam.

Offshore Platform Fluid Structure Interaction Simulation

2012 ◽  
Author(s):  
Ali Marzban ◽  
Murthy Lakshmiraju ◽  
Nigel Richardson ◽  
Mike Henneke ◽  
Guangyu Wu ◽  
...  
Keyword(s):  
Fluid Structure Interaction ◽  
Offshore Platform ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Structural Deformation ◽  
Fe Model ◽  
Cfd Analysis ◽  
Time Step ◽  
Fluid Structure ◽  
Structure Interaction

In this study a one-way coupled fluid-structure interaction (FSI) between ocean waves and a simplified offshore platform deck structure was modeled. The FSI model consists of a Volume of Fluid (VOF) based hydrodynamics model, a structural model and an interface to synchronize data between these two. A Computational Fluid Dynamics (CFD) analysis was used to capture the breaking wave and impact behavior of the fluid on the structure using commercially available software STAR-CCM+. A 3D Finite Element (FE) model of the platform deck developed in ABAQUS was used to determine the deflection of the structure due to hydrodynamic loads. Nonlinear material behavior was used for all structural parts in the FE model. Transient dynamic structural analysis and CFD analysis were coupled by transferring the CFD-predicted pressure distribution to the structural part in each time step using the co-simulation capabilities of STAR-CCM+ and ABAQUS. The one-way FSI model was applied to investigate the possible physical causes of observed wave damage of an offshore platform deck during a hurricane. It was demonstrated that with proper physical conditions/configurations, the FSI model could reproduce a structural deformation comparable to field measurement and provide valuable insight for forensic analysis.

Numerical Evaluation of Deformation and Stress in Impellers of Multistage Pumps by Means of Fluid Structure Interaction

2013 ◽  
Author(s):  
Andreas Schneider ◽  
Björn-Christian Will ◽  
Martin Böhle
Keyword(s):  
Numerical Evaluation ◽  
Fluid Structure Interaction ◽  
Hydrodynamic Pressure ◽  
Operational Reliability ◽  
Operating Conditions ◽  
Design Parameters ◽  
Centrifugal Pumps ◽  
Fluid Structure ◽  
Structural Part ◽  
Structure Interaction

The operational reliability of centrifugal pumps strongly depends on an adequate structural design of every single component. Therefore, the design process requires trustworthy information about the expected stresses and deformations. The numerical evaluation of the deformations and the stresses in the impellers of multistage centrifugal pumps is the topic of this report. The loads acting on the impeller under operating conditions can be subdivided into structural and hydrodynamic components, which are considered by means of one-way coupled fluid-structure interaction (FSI) simulations. For the investigations, an exemplary multistage pump with a specific speed of nq = 30 has been chosen. The hydrodynamic pressure loads on the impeller are derived from the CFD solution for a single stage of the pump. These pressure loads are imposed on the impeller in the structural part of the simulation. In order to determine the resulting deformations and stresses of the impeller, static structural analyses are performed. Different operating conditions, i.e. flow rates and temperatures, are analyzed. Furthermore, the influence of structural impeller design parameters on the resulting deformations and stresses is investigated in detail. The thickness of the impeller shrouds as well as the fillet radii between the blades and the shrouds are considered as design parameters.

Hydrodynamic pressure on a vertical gate considering fluid–structure interaction

2008 ◽  
Vol 44 (12-13) ◽  
pp. 759-766 ◽  
Author(s):  
P.K. Pani ◽  
S.K. Bhattacharyya
Keyword(s):  
Fluid Structure Interaction ◽  
Hydrodynamic Pressure ◽  
Fluid Structure ◽  
Structure Interaction

Fluid Structure Interaction Study on Dynamic Response of a Capped Drilling Riser Filled With Mud

2014 ◽  
Author(s):  
K. W. Paczkowski ◽  
P. Zhang ◽  
R. Rogers ◽  
N. Richardson
Keyword(s):  
Fluid Structure Interaction ◽  
Coupled System ◽  
Fe Model ◽  
Drilling Mud ◽  
Offshore Drilling ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Linear Behavior ◽  
Computational Fluid Dynamics Cfd ◽  
Structural Parts

In the offshore drilling, during emergency disconnect scenario the drilling operation must not be maintained and forced LMRP disconnect procedure takes place [1,2]. Such procedure allows drilling mud to interact with seawater. The paper presents hydrodynamic behavior of a drilling riser when mud is retained and not interacted with seawater. A two-way coupled fluid-structure interaction (FSI) model between a simplified drilling riser structure and mud fluid was studied through techniques of computational fluid dynamics (CFD). The volume of fluid (VOF) hydrodynamics model was used with commercially available software STAR-CCM+ [3]. A 3D finite element (FE) model of a drilling riser was created in FE software ABAQUS [4] to determine the stress and deflection of structural parts of the model due to hydrodynamic loads. In the model, the compressibility [5] and non-linear behavior of the mud was included. The dynamic frequencies of the two domains and possible resonance of the coupled system were investigated. The aim of the study was to verify the dynamic behavior of a riser system with a drilling mud enclosed within the system. The authors of this paper know no similar study of such a problem.

Research on the Effect of Fluid-Structure Interaction on Dynamic Response of Gate Structure

2011 ◽  
Vol 199-200 ◽  
pp. 811-818
Author(s):  
Hua Gu ◽  
Gen Hua Yan
Keyword(s):  
Dynamic Response ◽  
Interaction Effect ◽  
Fluid Structure Interaction ◽  
Structural Response ◽  
Structural Dynamic ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Response Characteristics ◽  
Gate Structure ◽  
The Impact

This essay reveals that on the basis of fluid-structure interaction having appreciable impact on auto-vibration of gate structure, analysis and calculation on dynamic response characteristics of gate structural fluid-structure interaction have been conducted. The results indicate that under the same dynamic load the structural dynamic response value with fluid-structure interaction effect considered is remarkably larger than vibration response with fluid-structure interaction effect considering. The calculating results indicate that the largest response increase of typical parts of gate structure is from 50% to 60%. Therefore, as to making calculations on structural dynamic response with fluid-structure interaction effect, the impact flow field exerting on structural response should be taken into consideration.

FINITE ELEMENT MODELING OF THE HUMAN COCHLEA USING FLUID–STRUCTURE INTERACTION METHOD

2015 ◽  
Vol 15 (03) ◽  
pp. 1550039 ◽  
Author(s):  
LIFU XU ◽  
XINSHENG HUANG ◽  
NA TA ◽  
ZHUSHI RAO ◽  
JIABIN TIAN
Keyword(s):  
Finite Element ◽  
Transfer Functions ◽  
Basilar Membrane ◽  
Fluid Structure Interaction ◽  
Fe Model ◽  
Ear Canal ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Human Cochlea ◽  
Intracochlear Pressure

In this paper, a 3D finite element (FE) model of human cochlea is developed. This passive model includes the structure of oval window, round window, basilar membrane (BM) and cochlear duct which is filled with fluid. Orthotropic material property of the BM is varying along its length. The fluid–structure interaction (FSI) method is used to compute the responses in the cochlea. In particular, the viscous fluid element is adopted for the first time in the cochlear FE model, so that the effects of shear viscosity in the fluid are considered. Results on the cochlear impedance, BM response and intracochlear pressure are obtained. The intracochlear pressure includes the scala vestibule and scala tympani pressure are extracted and used to calculate the transfer functions from equivalent ear canal pressures to scala pressures. The reasonable agreements between the model results and the experimental data in the literature prove the validity of the cochlear model for simulating sound transmission in the cochlea. Moreover, this model predicted the transfer function from equivalent ear canal pressures to scala pressures which is the input to the cochlear partition.

Impact of Skew Vane Cut on Alternating Stress in a Low Specific Speed Radial Pump Impeller Vane Using Fluid-Structure Interaction (FSI) Simulations

2021 ◽  
Author(s):  
Rajavamsi Gangipamula ◽  
Ashish Prajapati ◽  
Ravindra Birajdar ◽  
Shyam Shukla
Keyword(s):  
Cfd Simulation ◽  
Fluid Structure Interaction ◽  
Suction Side ◽  
Transient Behavior ◽  
Fe Model ◽  
Pressure Pulsations ◽  
Pump Impeller ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Radial Pump

Abstract Numerical studies are presented on the pressure pulsations, hydraulic excitation forces and alternative stresses produced in a radial volute pump with high head application. The effect of excitation forces due to Rotor-Stator Interaction (RSI) are evaluated using One-way fluid structure Interaction in terms of alternative stresses on impeller pressure side and suction side. Initially, the pump performance parameters are predicted using steady state Computational Fluid Dynamics (CFD) simulations and compared with the available test data. Due to the transient behavior of pressure pulsations, a transient CFD simulation has been conducted using RANS models to predict the pressure pulsations and its behavior with time on impeller vane outlet and tongue locations. These unsteady pressure distributions are further coupled with the Finite element (FE) model of the impeller to solve and monitor for the stresses induced due to the transient hydraulic loading. To attenuate the alternating stresses produced due to RSI, the geometry of the vane is modified by providing a skew cut with 30° at vane outlet. The pressure pulsation amplitude and stresses are reduced by 10% and 10% respectively for a skew cut of 30° at vane trailing edge.

scholarly journals Fluid/structure Interaction Numerical Study on the Mechanical Integrity of Water Dam Reservoir Banks

2020 ◽  
Vol 815 ◽  
pp. 012021
Author(s):  
F C Ng ◽  
Aqil Azman ◽  
Aizat Abas ◽  
Mohd Hafiz Zawawi ◽  
Ahmad Zhafran Ahmad Mazlan ◽  
...  
Keyword(s):  
Numerical Study ◽  
Fluid Structure Interaction ◽  
Dam Reservoir ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Mechanical Integrity

Fluid-Structure Interaction Simulation Using an Incompressible SPH method

2008 ◽  
Author(s):  
Ashkan Rafiee ◽  
Krish P. Thiagarajan
Keyword(s):  
Water Pressure ◽  
Fluid Structure Interaction ◽  
Momentum Equation ◽  
Sph Method ◽  
Fluid Structure ◽  
Pressure Poisson Equation ◽  
Structure Interaction ◽  
Solid Structure ◽  
Particle Hydrodynamics ◽  
Structural Deformations

In this paper an incompressible Smoothed Particle Hydrodynamics (SPH) method is proposed for simulation of fluid-structure interaction problems, deploying the pressure Poisson equation to satisfy incompressibility constraints. Viscous fluid flow past rigid and hypoelastic solid surfaces is studied. The fluid is fully coupled with the solid structure that can undergo large structural deformations. A key feature of the proposed scheme is that the no-slip and coupling conditions on the contact surface are satisfied automatically. To alleviate the numerical difficulties encountered when a hypoelastic solid structure is highly stretched, an artificial stress term is incorporated into the momentum equation which reduces the risk of unrealistic fractures in the material. Three challenging test cases, deformation of an elastic plate subjected to time-dependent water pressure, collapse of a water column with an obstacle and breaking dam on a hypoelastic wall are solved to demonstrate the capability of the proposed scheme. The results are in very good agreement with available experimental results.

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