A computational model of ureteral peristalsis and an investigation into ureteral reflux

Hosseini, Ghazaleh; Ji, Chunning; Xu, Dong; Rezaienia, Mohammad Amin; Avital, Eldad; Munjiza, Ante; Williams, John; Green, J. S. A.

doi:10.1007/s13534-017-0053-0

Cited by 19 publications

(20 citation statements)

References 31 publications

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“…As already noted, two types of FSI problems are investigated: submerged vegetation in a channel flow and kinetic turbine rotors. The FSI code has already been extensively verified in previous publications [10,[18][19][20][21][22][23], and thus, only verifications specific to the class of the investigated cases are shown followed by results of interest.…”

Section: Results and Analysismentioning

confidence: 99%

“…An IBM algorithm ties the two solvers together. This FSI methodology has already been successfully implemented for a range of problems from bio-fluids of red blood cells flow [18,19] and urine flow in the ureter [20] to sediment [21,22] and marine tidal turbines [10]. In this section, the main points of the method are highlighted, where further details are given in Refs.…”

Section: Methodsmentioning

confidence: 99%

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Fluid–structure interaction of flexible submerged vegetation stems and kinetic turbine blades

et al. 2019

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A fluid-structure interaction (FSI) methodology is presented for simulating elastic bodies embedded and/or encapsulating viscous incompressible fluid. The fluid solver is based on finite volume and the large eddy simulation approach to account for turbulent flow. The structural dynamic solver is based on the combined finite element method-discrete element method (FEM-DEM). The two solvers are tied up using an immersed boundary method (IBM) iterative algorithm to improve information transfer between the two solvers. The FSI solver is applied to submerged vegetation stems and blades of small-scale horizontal axis kinetic turbines. Both bodies are slender and of cylinder-like shape. While the stem mostly experiences a dominant drag force, the blade experiences a dominant lift force. Following verification cases of a single-stem deformation and a spinning Magnus blade in laminar flows, vegetation flexible stems and flexible rotor blades are analysed, while they are embedded in turbulent flow. It is shown that the single stem's flexibility has higher effect on the flow as compared to the rigid stem than when in a dense vegetation patch. Making a marine kinetic turbine rotor flexible has the potential of significantly reducing the power production due to undesired twisting and bending of the blades. These studies point to the importance of FSI in flow problems where there is a noticeable deflection of a cylinder-shaped body and the capability of coupling FEM-DEM with flow solver through IBM.

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Section: Results and Analysismentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fluid–structure interaction of flexible submerged vegetation stems and kinetic turbine blades

et al. 2019

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“…There are growing interests on studies of peristalsis of non-Newtonian fluid flows due to their fundamental importance in physiological, engineering, industrial and medical applications. In biological process, such motion occurs in movement of chyme in gastrointestinal tract 1 , circulation of blood in arterioles 2 , passage of urine in ureters 3 , passage of ovum in the fallopian tube 4 , swallowing food via esophagus 5 and so on. Important characteristics of peristalsis of viscous fluid is initially studied by Latham 6 and Shapiro et al 7 , they examined peristalsis of viscous fluid in channel/tube under lubrication approaches.…”

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confidence: 99%

Peristaltic channel flow and heat transfer of Carreau magneto hybrid nanofluid in the presence of homogeneous/heterogeneous reactions

Bibi

2020

Sci Rep

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The purpose of present work is to explore the features of homogeneous-heterogeneous reactions in peristalsis flow of Carreau magneto hybrid nanofluid with copper and silver nanoparticles in a symmetric channel. The velocity slip condition and thermal radiation effect is also taken in the simplified model. Thermodynamic optimization aspect is discussed through the entropy generation analysis. The proposed mathematical systems are modified by using a lubrication approach and solved by a homotopy-based package-BVPh 2.0. The impacts of different involved parameters on flow characteristics, thermal characteristics, chemically reactive concentration and entropy generation are scrutinized through analytic results. It reveals that the fluid velocity decreases with the increasing values of the Weissenberg and the Hartman numbers. Characteristics of the Brinkman and the thermal radiation numbers are quite reverse for the heat transfer rate. In addition, entropy generation decreases with thermal radiation and Weissenberg number. The main outcome signifies that hybrid nanofluid is better thermal conductor as compared to the conventional nanofluid. Nomenclature V Velocity of the nanofluid B Magnetic field J Current density P Pressure T Temperature c p Heat capacity Wave length k Thermal conductivity 2a Width of the channel α Concentration of chemical species Ā β Concentration of chemical species B b Amplitude of the peristaltic wave k c Homogeneous reaction coefficient k s Heterogeneous reaction coefficient D A Diffusion coefficient of chemical species A D B Diffusion coefficient of chemical species B c p Specific heat at constant pressure Sc Schmidt number Re Reynold number M Hartman number

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“…It much reduces the complexity of the simulation while Quadrio et al 24 argued for its effect to be small on the result, although it can be of importance in people who have cartilage weakness, trauma or high abutment of the lateral crus to the pyriform aperture. The computational technology to simulate the flow-structure interaction for bio-fluid applications exists as was done for the human ureter 25 . It requires good knowledge of the wall structural properties and thus is left for a future study.…”

Section: Computational Methodologymentioning

confidence: 99%

Nasal Internal and External Aerodynamics for Healthy and Blocked Cavities

Nayebossadri

Avital

Motallebi

et al. 2018

J. Mech. Med. Biol.

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Human nasal airflow in a healthy and partially blocked cavities is investigated using computational and experimental means. While previous studies focused on the flow inside the nasal cavity, this study also looks at the external air stream coming out of the nostrils. The aim is to investigate the airflow subject to partial blocking in the nasal cavity and assess the potential of using a flow visualization method to identify abnormal nasal geometry. Two methods of study are used: Computational Fluid Dynamics (CFD) and experiment based on Particle Image Velocimetry (PIV). Nasal cavity geometry is reconstructed from CT scans. The flow visualization Schileren method is also demonstrated. The computational results agree well with the previous results in terms of Nasal Resistance (NR) and character of the internal flow. Good agreement is also found in the external aerodynamics during expiration between the computational and experimental results. Several generic partial blockages are investigated to show changes in NR, turbulence energy and the air stream leaving the nostrils during expiration. Anterior blockages are found to have more profound effects on all these three aspects, but all show effects on the external air stream. A possible universal angle for the external air stream emitted by a healthy nasal cavity is discussed.

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A computational model of ureteral peristalsis and an investigation into ureteral reflux

Cited by 19 publications

References 31 publications

Fluid–structure interaction of flexible submerged vegetation stems and kinetic turbine blades

Fluid–structure interaction of flexible submerged vegetation stems and kinetic turbine blades

Peristaltic channel flow and heat transfer of Carreau magneto hybrid nanofluid in the presence of homogeneous/heterogeneous reactions

Nasal Internal and External Aerodynamics for Healthy and Blocked Cavities

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