Numerical study of rogue wave overtopping with a fully-coupled fluid-structure interaction model

2017 ◽  
Vol 137 ◽  
pp. 48-58 ◽  
Author(s):  
Zhe Hu ◽  
Wenyong Tang ◽  
Hongxiang Xue ◽  
Xiaoying Zhang ◽  
Kunpeng Wang
Keyword(s):  
Rogue Wave ◽  
Numerical Study ◽  
Fluid Structure Interaction ◽  
Interaction Model ◽  
Wave Overtopping ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Fully Coupled

scholarly journals A fully coupled fluid-structure interaction model of the secondary lymphatic valve

2018 ◽  
Vol 21 (16) ◽  
pp. 813-823 ◽  
Author(s):  
John T. Wilson ◽  
Lowell T. Edgar ◽  
Saurabh Prabhakar ◽  
Marc Horner ◽  
Raoul van Loon ◽  
...  
Keyword(s):  
Fluid Structure Interaction ◽  
Interaction Model ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Lymphatic Valve ◽  
Fully Coupled

A Fully Coupled Fluid-Structure-Interaction Model for Foil Gas Bearings

2012 ◽  
Author(s):  
Wei Zhang ◽  
Abbas A. Alahyari ◽  
Louis Chiappetta
Keyword(s):  
Load Capacity ◽  
Fluid Structure Interaction ◽  
Interaction Model ◽  
Working Fluid ◽  
Performance Parameters ◽  
Fluid Structure ◽  
Gas Bearings ◽  
Structure Interaction ◽  
Gas Bearing ◽  
Fully Coupled

Foil gas bearings are self-acting, compliant-surface hydrodynamic bearings that usually use air or other process gas as their working fluid or lubricant. Foil gas bearings are made of one or more bump foils, which are compliant surfaces of corrugated metal, and one or more layers of top foil. Because foil gas bearing performance parameters, such as load capacity, are dominated by foil material and foil geometric designs, numerical models have been developed to predict the bearing’s performance based on these characteristics. However, previous models often simplify bump foil as elastic foundation with constant stiffness and neglect top foil altogether. Further, they typically use the Reynolds equation to simplify the fluid solution. In this study, ANSYS software is used to build a 3D, fully-coupled, fluid-structure-interaction model for a foil gas bearing to predict key performance parameters such as load capacity and journal attitude angle. The model’s results show good agreement with previously published test data. This not only demonstrates the feasibility of 3D fully coupled fluid-structure-interaction model for a conventional foil bearing using commercial codes, but also shows modeling capability for future generations of foil gas bearing.

scholarly journals Numerical Study of Fully Coupled Fluid-Structure Interaction of Stented Ureter by Varying the Stent Side-Holes

2021 ◽  
Author(s):  
Erick Martinez ◽  
Ben Xu ◽  
Jianzhi Li ◽  
Yingchen Yang
Keyword(s):  
Flow Rate ◽  
Numerical Study ◽  
Fluid Structure Interaction ◽  
Urine Flow ◽  
Stent Design ◽  
Ureteral Stents ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Medical Issues ◽  
Fully Coupled

Abstract Ureteral stents are a measure used for many medical issues involving urology, such as kidney stones or kidney transplants. The purpose of applying stents is to help relieve the urine flow while the ureter is either blocked or trying to close itself, which creates blockages. These ureteral stents, while necessary, cause pain and discomfort to patients due to them being a solid that moves around inside the patients’ body. The ureter normally moves urine to the bladder through peristaltic forces. Due to the ureter being a hyperelastic material, these peristaltic forces cause the ureter to deform easily, making it necessary for the stent to properly move the urine that flows through it for the patient not to face further medical complications. In this study, we seek to find a relation between the amount of stent side holes and the overall flow rate inside the stent with the ureter contracting due to peristalsis. A fully coupled fluid-structure interaction (FSI) model is developed to visualize how the ureter deforms due to peristalsis and the subsequent effect on the urine flow due to the ureter’s deformation. Numerical simulations using COMSOL Multiphysics, a commercial finite-element based solver, were used to study the fluid-structure interaction, and determine whether the stent performs more properly as the amount of stent side holes increases. The results showed that the stent model with a 10 mm distance between side hole pairs provided the highest outlet flow rate, which indicates a proper stent design that allows for maximized urine discharge. We hope this study can help improve the stent design in kidney transplant procedures to further ease the inconvenience on the patients.

A Fully Coupled Fluid–Structure Interaction Model for Foil Gas Bearings

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Wei Zhang ◽  
Abbas A. Alahyari ◽  
Louis Chiappetta
Keyword(s):  
Load Capacity ◽  
Fluid Structure Interaction ◽  
Interaction Model ◽  
Working Fluid ◽  
Performance Parameters ◽  
Fluid Structure ◽  
Gas Bearings ◽  
Structure Interaction ◽  
Gas Bearing ◽  
Fully Coupled

Foil gas bearings are self-acting, compliant-surface hydrodynamic bearings that usually use air or other process gas as their working fluid or lubricant. Foil gas bearings are made of one or more bump foils, which are compliant surfaces of corrugated metal, and one or more layers of top foil. Because foil gas bearing performance parameters, such as load capacity, are dominated by foil material and foil geometric designs, numerical models have been developed to predict the bearing's performance based on these characteristics. However, previous models often simplify bump foil as elastic foundation with constant stiffness and neglect top foil altogether. Further, they typically use the Reynolds equation to simplify the fluid solution. In this study, ansys software is used to build a 3D, fully coupled, fluid–structure interaction (FSI) model for a foil gas bearing to predict the key performance parameters such as load capacity and journal attitude angle. The model's results show good agreement with previously published test data. This not only demonstrates the feasibility of 3D fully coupled fluid–structure interaction model for a conventional foil bearing using commercial codes, but also shows modeling capability for future generations of foil gas bearing.

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