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    Numerical Simulation of Flow in Mechanical Heart Valves: Grid Resolution and the Assumption of Flow Symmetry

    Source: Journal of Biomechanical Engineering:;2003:;volume( 125 ):;issue: 005::page 709
    Author:
    Liang Ge
    ,
    Timothy M. Healy
    ,
    Ajit P. Yoganathan
    ,
    S. Casey Jones
    ,
    Fotis Sotiropoulos
    DOI: 10.1115/1.1614817
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A numerical method is developed for simulating unsteady, 3-D, laminar flow through a bileaflet mechanical heart valve with the leaflets fixed. The method employs a dual-time-stepping artificial-compressibility approach together with overset (Chimera) grids and is second-order accurate in space and time. Calculations are carried out for the full 3-D valve geometry under steady inflow conditions on meshes with a total number of nodes ranging from 4×105 to 1.6×106. The computed results show that downstream of the leaflets the flow is dominated by two pairs of counter-rotating vortices, which originate on either side of the central orifice in the aortic sinus and rotate such that the common flow of each pair is directed away from the aortic wall. These vortices intensify with Reynolds number, and at a Reynolds number of approximately 1200 their complex interaction leads to the onset of unsteady flow and the break of symmetry with respect to both geometric planes of symmetry. Our results show the highly 3-D structure of the flow; question the validity of computationally expedient assumptions of flow symmetry; and demonstrate the need for highly resolved, fully 3-D simulations if computational fluid dynamics is to accurately predict the flow in prosthetic mechanical heart valves.
    keyword(s): Flow (Dynamics) , Resolution (Optics) , Valves , Vortices , Geometry , Engineering simulation , Heart valve prostheses , Numerical analysis , Computational fluid dynamics AND Computer simulation ,
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      Numerical Simulation of Flow in Mechanical Heart Valves: Grid Resolution and the Assumption of Flow Symmetry

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    http://yetl.yabesh.ir/yetl1/handle/yetl/127951
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    • Journal of Biomechanical Engineering

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    contributor authorLiang Ge
    contributor authorTimothy M. Healy
    contributor authorAjit P. Yoganathan
    contributor authorS. Casey Jones
    contributor authorFotis Sotiropoulos
    date accessioned2017-05-09T00:09:29Z
    date available2017-05-09T00:09:29Z
    date copyrightOctober, 2003
    date issued2003
    identifier issn0148-0731
    identifier otherJBENDY-26338#709_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/127951
    description abstractA numerical method is developed for simulating unsteady, 3-D, laminar flow through a bileaflet mechanical heart valve with the leaflets fixed. The method employs a dual-time-stepping artificial-compressibility approach together with overset (Chimera) grids and is second-order accurate in space and time. Calculations are carried out for the full 3-D valve geometry under steady inflow conditions on meshes with a total number of nodes ranging from 4×105 to 1.6×106. The computed results show that downstream of the leaflets the flow is dominated by two pairs of counter-rotating vortices, which originate on either side of the central orifice in the aortic sinus and rotate such that the common flow of each pair is directed away from the aortic wall. These vortices intensify with Reynolds number, and at a Reynolds number of approximately 1200 their complex interaction leads to the onset of unsteady flow and the break of symmetry with respect to both geometric planes of symmetry. Our results show the highly 3-D structure of the flow; question the validity of computationally expedient assumptions of flow symmetry; and demonstrate the need for highly resolved, fully 3-D simulations if computational fluid dynamics is to accurately predict the flow in prosthetic mechanical heart valves.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleNumerical Simulation of Flow in Mechanical Heart Valves: Grid Resolution and the Assumption of Flow Symmetry
    typeJournal Paper
    journal volume125
    journal issue5
    journal titleJournal of Biomechanical Engineering
    identifier doi10.1115/1.1614817
    journal fristpage709
    journal lastpage718
    identifier eissn1528-8951
    keywordsFlow (Dynamics)
    keywordsResolution (Optics)
    keywordsValves
    keywordsVortices
    keywordsGeometry
    keywordsEngineering simulation
    keywordsHeart valve prostheses
    keywordsNumerical analysis
    keywordsComputational fluid dynamics AND Computer simulation
    treeJournal of Biomechanical Engineering:;2003:;volume( 125 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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