Numerical Investigation of Bumps and Oscillation in the Cylindrical Membrane Inflation

2013 ◽  
Vol 444-445 ◽  
pp. 1335-1339
Author(s):  
Cong Lei Wang ◽  
Jian Hong Sun ◽  
Chang Yue Xu
Keyword(s):  
Numerical Investigation ◽  
Vortex Flow ◽  
Fluid Structure Interaction ◽  
Jet Flow ◽  
Wave System ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Working Performance ◽  
Membrane Inflation ◽  
Compressible Jet

Numerical investigation on the fluid structure interaction in the cylindrical membrane inflation is performed by the Euler-Largrangian method. In membrane inflation, the vortex flow and wave system induced by the interaction between compressible jet flow and membrane appeared inside membrane. This phenomenon concentrates the stresses and generates a pair of bumps. The influences of oscillation and bumps on membrane working performance and safety are also investigated.

scholarly journals Experimental and numerical investigation of the fluid-structure interaction on a flexible composite hydrofoil under viscous flows

2019 ◽  
Vol 194 ◽  
pp. 106647 ◽  
Author(s):  
Laetitia Pernod ◽  
Antoine Ducoin ◽  
Hervé Le Sourne ◽  
Jacques-André Astolfi ◽  
Pascal Casari
Keyword(s):  
Numerical Investigation ◽  
Fluid Structure Interaction ◽  
Viscous Flows ◽  
Fluid Structure ◽  
Structure Interaction

Fluid–Structure Interaction Models of Bicuspid Aortic Valves: The Effects of Nonfused Cusp Angles

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Karin Lavon ◽  
Rotem Halevi ◽  
Gil Marom ◽  
Sagit Ben Zekry ◽  
Ashraf Hamdan ◽  
...  
Keyword(s):  
Flow Direction ◽  
Fluid Dynamic ◽  
Fluid Structure Interaction ◽  
Jet Flow ◽  
Elastic Behavior ◽  
Principal Stresses ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Biomechanical Models ◽  
Hyper Elastic

Bicuspid aortic valve (BAV) is the most common type of congenital heart disease, occurring in 0.5–2% of the population, where the valve has only two rather than the three normal cusps. Valvular pathologies, such as aortic regurgitation and aortic stenosis, are associated with BAVs, thereby increasing the need for a better understanding of BAV kinematics and geometrical characteristics. The aim of this study is to investigate the influence of the nonfused cusp (NFC) angle in BAV type-1 configuration on the valve's structural and hemodynamic performance. Toward that goal, a parametric fluid–structure interaction (FSI) modeling approach of BAVs is presented. Four FSI models were generated with varying NFC angles between 120 deg and 180 deg. The FSI simulations were based on fully coupled structural and fluid dynamic solvers and corresponded to physiologic values, including the anisotropic hyper-elastic behavior of the tissue. The simulated angles led to different mechanical behavior, such as eccentric jet flow direction with a wider opening shape that was found for the smaller NFC angles, while a narrower opening orifice followed by increased jet flow velocity was observed for the larger NFC angles. Smaller NFC angles led to higher concentrated flow shear stress (FSS) on the NFC during peak systole, while higher maximal principal stresses were found in the raphe region during diastole. The proposed biomechanical models could explain the early failure of BAVs with decreased NFC angles, and suggests that a larger NFC angle is preferable in suture annuloplasty BAV repair surgery.

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