scholarly journals Analisis Performa Artificial Hip Joint untuk Posisi Rukuk dalam Gerakan Salat dengan Menggunakan Teknik FSI (Fluid-Structure Interaction)

ROTASI ◽  
2018 ◽  
Vol 20 (3) ◽  
pp. 137
Author(s):  
Mohammad Tauviqirrahman ◽  
Rifky Ismail ◽  
Rifky Ardiansyah Budiman
Keyword(s):  
Synovial Fluid ◽  
Hip Joint ◽  
Fluid Structure Interaction ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Artificial Hip Joint ◽  
Artificial Hip ◽  
Von Mises

Pengguna sendi tulang panggul buatan (artificial hip joint) disarankan oleh para dokter untuk membatasi gerakan ekstrim yang dapat merusak hip joint buatan. Gerakan tersebut misalnya jongkok, berlari, dan salat. Selama ini, penelitian tentang artificial hip joint cenderung tidak menyertakan keberadaan cairan pelumas sendi, yaitu synovial fluid. Penelitian ini bertujuan untuk menganalisis pengaruh synovial fluid pada hip joint terhadap karakteristik pelumasan, serta struktur dari artificial hip joint tersebut. Yang menjadi fokus dalam penelitian ini adalah gerakan salat berupa rukuk. Simulasi ini dilakukan pada model artificial hip joint jenis bipolar dengan menggunakan metode elemen hingga pada komponen solid dan fluid-structure interaction (FSI) pada komponen fluid untuk mendefinisikan pengaruh satu sama lain antara kedua komponen terhadap tekanan hidrodinamik, deformasi dan tegangan von Mises. Dari hasil simulasi didapatkan bahwa gerakan rukuk memiliki deformasi yang relatif cukup kecil jika dibandingkan dengan toleransi (clearance) yang ada, sehingga resiko impingement sangat kecil. Selain itu, dari hasil simulasi juga dibuktikan bahwa keberadaan synovial fluid memiliki pengaruh yang signifikan terhadap performa artificial hip joint, sehingga tidak bisa diabaikan.

scholarly journals ANALISIS PELUMASAN ELASTOHYDRODYNAMIC PADA SAMBUNGAN TULANG PANGGUL BUATAN UNTUK POSISI SUJUD DALAM SALAT DENGAN MENGGUNAKAN TEKNIK CFD DAN FSI

2018 ◽  
Vol 9 (1) ◽  
pp. 269-278
Author(s):  
Mohammad Tauviqirrahman ◽  
Rifki Ardiansyah Budiman
Keyword(s):  
Synovial Fluid ◽  
Hip Joint ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Fluid Structure Interaction ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Artificial Hip Joint ◽  
Artificial Hip

Pelumasan pada sambungan tulang panggul buatan (artificial hip joint) diperlukan untuk menjaga reliabilitas dan  umur  pakai  komponen  prostesis  ini  ketika  digunakan  oleh  pengguna.  Berdasarkan tinjauan  pustaka, kebanyakan studi tentang sambungan tulang panggul buatan mengasumsikan kondisi tanpa pelumas (synovial fluid), sehingga bisa mengakibatkan kesimpulan penelitian yang keliru. Penelitian ini bertujuan untuk menganalisis pengaruh keberadaan pelumas pada sambungan tulang panggul buatan terhadap karakteristik pelumasan, serta struktur dari komponen penyusun sambungan. Untuk memperoleh hasil yang akurat, teknik CFD (Computational Fluid Dynamic) dan FSI (Fluid Structure Interaction) digunakan untuk menganalisis mekanisme pelumasan elastohydrodynamic pada sambungan. Fokus penelitian ini adalah analisis karakteristik sambungan tulang panggul buatan yang bergerak saat pengguna melakukan gerakan sujud dalam salat. Seperti diketahui, pengguna sambungan tulang panggul buatan disarankan oleh para dokter untuk membatasi gerakan ekstrim yang dapat merusak sambungan buatan ini. Gerakan tersebut misalnya jongkok, berlari, dan beberapa gerakan salat. Hasil simulasi menunjukkan bahwa untuk meningkatkan keakuratan hasil analisis sambungan tulang panggul buatan dalam tubuh, maka pelumas synovial fluid sangat penting untuk dipertimbangkan dan dimodelkan. Selain itu, keberadaan pelumas ini saat gerakan sujud terbukti membantu mencegah kontak antar permukaan sehingga kemungkinan terjadinya tubrukan (impingement) antar komponen dapat dicegah.

3D fluid-structure interaction (FSI) simulation of new type vortex generators in smooth wavy fin-and-elliptical tube heat exchanger

2016 ◽  
Vol 33 (8) ◽  
pp. 2504-2529 ◽  
Author(s):  
Babak Lotfi ◽  
Bengt Sunden ◽  
Qiu-Wang Wang
Keyword(s):  
Heat Exchanger ◽  
Mechanical Behavior ◽  
Elastic Strain ◽  
Fluid Structure Interaction ◽  
Vortex Generators ◽  
Von Mises Stress ◽  
Fluid Structure ◽  
Content Type ◽  
Structure Interaction ◽  
Von Mises

Purpose The purpose of this paper is to investigate the numerical fluid-structure interaction (FSI) framework for the simulations of mechanical behavior of new vortex generators (VGs) in smooth wavy fin-and-elliptical tube (SWFET) heat exchanger using the ANSYS MFX Multi-field® solver. Design/methodology/approach A three-dimensional FSI approach is proposed in this paper to provide better understanding of the performance of the VG structures in SWFET heat exchangers associated with the alloy material properties and geometric factors. The Reynolds-averaged Navier-Stokes equations with shear stress transport turbulence model are applied for modeling of the turbulent flow in SWFET heat exchanger and the linear elastic Cauchy-Navier model is solved for the structural von Mises stress and elastic strain analysis in the VGs region. Findings Parametric studies conducted in the course of this research successfully identified illustrate that the maximum magnitude of von Mises stress and elastic strain occurs at the root of the VGs and depends on geometrical parameters and material types. These results reveal that the titanium alloy VGs shows a slightly higher strength and lower elastic strain compared to the aluminum alloy VGs. Originality/value This paper is one of the first in the literature that provides original information mechanical behavior of a SWFET heat exchanger model with new VGs in the field of FSI coupling technique.

Fluid Structure Interaction Analysis of Stentless Bio-Prosthetic Aortic Heart Valve in Sinus of Valsalva

2010 ◽  
Author(s):  
Esfandyar Kouhi ◽  
Yos Morsi
Keyword(s):  
Blood Flow ◽  
Heart Valve ◽  
Interaction Analysis ◽  
Fluid Structure Interaction ◽  
Fluid Pressure ◽  
Von Mises Stress ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Aortic Heart Valve ◽  
Von Mises

In this paper the fluid structure interaction in stentless aortic heart valve during acceleration phase was performed successfully using the commercial ANSYS/CFX package. The aim is to provide unidirectional coupling FSI analysis of physiological blood flow within an anatomically corrected numerical model of stentless aortic valve. Pulsatile, Newtonian, and turbulent blood flow rheology at aortic level was applied to fluid domain. The proposed structural prosthesis had a novel multi thickness leaflet design decreased from aortic root down to free age surface. An appropriate interpolation scheme used to import the fluid pressure on the structure at their interface. The prosthesis deformations over the acceleration time showed bending dominant characteristic at early stages of the cardiac cycle. More stretching and flattening observed in the rest of the times steps. The multi axial Von Mises stress data analysis was validated with experimental data which confirmed the initial design of the prosthesis.

A New Way to Simulate the Fluid Structure Interaction between the Bioprosthetic Heart Valve and Blood: FE-SPH Method

2014 ◽  
Vol 472 ◽  
pp. 125-130 ◽  
Author(s):  
Quan Yuan ◽  
Xin Ye
Keyword(s):  
Heart Valve ◽  
Numerical Models ◽  
Fluid Structure Interaction ◽  
Peak Stress ◽  
Bioprosthetic Heart Valve ◽  
Ejection Time ◽  
Sph Method ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Von Mises

The object of this study is to utilize FE-SPH method to simulate the dynamic behavior of bioprosthetic heart valve during systole. Two kind of bioprosthetic heart valve numerical models are designed based on membrane theory, and they are represented by FE mesh, the blood is modelled as SPH particles. The interaction between the blood and bioprosthetic heart valve is carried out with contact algorithms. Results show that: when the valve leaflets are opening, compared with that of spherical valve, the stress and strain states of cylindrical valve are unstable, and the peak Von Mises is also higher, which high peak stress and its instability may induce the fatigue of valve. The valve opening time of columnar valve leaflets is longer than that of spherical ones, which reduces the blood ejection time. Above results indicate that spherical valve is superior to cylindrical valve. The FE-SPH method is capable of simulating the fluid structure interaction between the bioprosthetic heart valve and blood during the systole.

Numerical Investigations of the Long Blade Performance Using RANS Solution and FEA Method Coupled With One-Way and Two-Way Fluid-Structure Interaction Models

2017 ◽  
Author(s):  
Minyan Yin ◽  
Jun Li ◽  
Liming Song ◽  
Zhenping Feng
Keyword(s):  
Rotor Blade ◽  
Mechanical Performance ◽  
Fluid Structure Interaction ◽  
Interaction Model ◽  
Leading Edge ◽  
Von Mises Stress ◽  
Maximum Displacement ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Von Mises

The aerodynamic and mechanical performance of the last stage was numerically investigated using three-dimensional Reynolds-Averaged Navier-Stokes (RANS) solution and Finite Element Analysis (FEA) coupled with the one-way and two-way fluid-structure interaction models in this work. The part-span damping snubber and tip damping shroud of the rotor blade and aerodynamic pressure on rotor blade mechanical performance was considered in the one-way model. The two-way fluid-structure interaction model coupled with the mesh deformation technology was conducted to analyze the aerodynamic and mechanical performance of the last stage rotor blade. One-way fluid-structure interaction model numerical results show that the location of nodal maximum displacement moves from leading edge of 85% blade span to the trailing edge of 85% blade span. The position of nodal maximum Von Mises stress is still located at the first tooth upper surface near the leading edge at the blade root of pressure side. The two-way fluid-structure interaction model results show that the variation of static pressure distribution on long blade surface is mostly concentrated at upper region, absolute outflow angle of long blade between the 40% span and 95% span reduces, the location of nodal maximum displacement appears at the trailing edge of 85% blade span. Furthermore, the position of nodal maximum Von Mises stress remains the same and the value decreases compared to the oneway fluid-structure model results.

scholarly journals Fluid-Structure Interaction on The Design of Fully Assembled Shell Eco-Marathon (SEM) Prototype Car

CFD letters ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 115-136
Author(s):  
Hedy Soon Keey Tiew ◽  
Ming Wei Lee ◽  
Wei Shyang Chang ◽  
Mohammad Hafifi Hafiz Ishak ◽  
Farzad Ismail
Keyword(s):  
Structural Integrity ◽  
Fibre Composite ◽  
Fuel Efficiency ◽  
Fluid Structure Interaction ◽  
Structural Response ◽  
Von Mises Stress ◽  
Fluid Structure ◽  
Structure Interaction ◽  
High Fuel Efficiency ◽  
Von Mises

To achieve high fuel efficiency, vehicles designs are inclined to choose lightweight materials and structures. However, these structures are generally weak, and structural integrity is a common concern. The purpose of this paper is to carry out fluid-structure interaction (FSI) study in one-way coupling analysis on a Shell Eco Marathon (SEM) prototype car which travels in a low-speed range to analyse its structural response. A new set of economical materials is proposed and analysed with the concern on self-fabrication process. The Flax fibre composite is introduced as a part of the proposed material set due to its environmental and economic advantages. The study herein is purely a numerical simulation work as a first approach to design a sustainable SEM prototype car. The fully assembled SEM prototype car was analysed with the proposed materials with ANSYS Workbench in the coupling of the fluid (ANSYS Fluent) and structural solver (ANSYS Mechanical) in a one-way FSI. Even with a thin shell design, the proposed material only experiences minimum deformations. The simulations also reveal that the maximum von-Mises stress experienced, after considered the safety factor, is still several order lower than the yield strength. This study has confirmed that the car design has fulfilled its structural requirements to operate at the design speed.

INVESTIGATION OF LEAFLET GEOMETRY IN A PERCUTANEOUS AORTIC VALVE WITH THE USE OF FLUID-STRUCTURE INTERACTION SIMULATION

2012 ◽  
Vol 12 (01) ◽  
pp. 1250003 ◽  
Author(s):  
K. H. J. VAN ASWEGEN ◽  
A. N. SMUTS ◽  
C. SCHEFFER ◽  
H. S. VH. WEICH ◽  
A. F. DOUBELL
Keyword(s):  
Aortic Valve ◽  
Fluid Structure Interaction ◽  
Von Mises Stress ◽  
Aortic Valves ◽  
Native Valve ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Prosthetic Valves ◽  
Significant Difference ◽  
Von Mises

Prosthetic aortic valves have been used for the replacement of dysfunctional native aortic valves in humans for more than fifty years. Current prosthetic valves have significant limitations and the development of improved aortic valve prostheses remains an important research focus area. This paper investigates one of the newer additions to the family of replacement valves, namely the stented percutaneous valve. An important design aspect of stented percutaneous valves, is the configuration of the leaflet's attachment to the surrounding stent. There are essentially two possible configurations: The first method is attaching the leaflets in a straight configuration, and the second method is to attach the leaflets in a curved configuration. Finite element models of both configurations were created, and the behavior of these configurations was then studied using a fluid-structure interaction (FSI) simulation. The FSI simulation was validated by means of comparing simulation results to actual measurements from a pulse duplicator using prototype valves of both configurations. The FSI results showed no significant difference between the valves' opening and closing behaviors. The von Mises stress distributions proved to be the largest differentiating and decisive factor between the two valves. The FSI simulations did however show that the leaflets that are attached in the straight configuration form folds that resembles that of the curved configuration as well as the native valve, but to a larger scale. The effect that these folds might have on valve tissue fatigue leaves room for future investigation.

Finite Element Analysis of Deep Elliptical Submersible Pressure Hull Subjected to a Side-On Non-Contact Underwater Explosion

2014 ◽  
Vol 578-579 ◽  
pp. 256-262 ◽  
Author(s):  
Fathallah Elsayed ◽  
Li Li Tong ◽  
Hui Qi ◽  
Mahmoud Helal
Keyword(s):  
Finite Element ◽  
Fluid Structure Interaction ◽  
Spherical Wave ◽  
Underwater Explosion ◽  
Surface Displacement ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Von Mises

Predicting the dynamic response of a floating and submerged structure subjected to underwater explosion is greatly complicated by the explosion of a high explosive, propagation of shock wave, bubble-pulse, complex fluid-structure interaction phenomena and the dynamic behavior of the floating structures. A numerical simulation has been carried out to examine the behavior of elliptical submersible pressure hull to non-contact underwater explosion (UNDEX) and take the effect of bubble-pulse. The finite element package ABAQUS was used to model the UNDEX and the fluid-structure interaction (FSI) phenomena. The pressure wave resulting from an UNDEX was assumed to be a spherical wave. Plastic strain and the time histories of the wet-surface displacement, velocity and von Mises stress are presented. The analytical results are valuable for designing underwater vehicles to resist UNDEX.

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