Inferior Vena Cava Filter FluidStructure Interaction Analysis - PowerPoint PPT Presentation

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Inferior Vena Cava Filter FluidStructure Interaction Analysis

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... Vena Cava (IVC) Filters prevents the passage of large life-threatening emboli to ... Understanding of the filter-vessel-flow interaction ... – PowerPoint PPT presentation

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Title: Inferior Vena Cava Filter FluidStructure Interaction Analysis


1
Inferior Vena Cava FilterFluid-Structure
InteractionAnalysis
2
Inferior Vena Cava Filter
  • Inferior Vena Cava (IVC) Filters prevents the
    passage of large life-threatening emboli to the
    lungs.
  • Treatment is an alternative to anticoagulant
    therapy
  • Analyses provide
  • Understanding of the filter-vessel-flow
    interaction
  • Opportunity for design iterations to modify flow
    field, limit filter deformations reduce filter
    stresses, etc.

3
Structure Geometry and Mesh
  • Structural Geometry from CAD Model (Pro/E,
    Unigraphics, Design Modeler, etc.)
  • Computational mesh generated in Ansys
  • Mapped mesh using extrustion and sweep meshing
    techniques
  • Boundary Conditions created in ANSYS GUI.

4
Structural Boundary Conditions
  • Similar to structural analysis modeling
  • ¼ Symmetric model with symmetry BCs
  • Vessel supported on Ends to prevent rigid body
    motion
  • Fluid structure interaction defined with surface
    loading
  • Total time and time step setup matches CFX input
  • Forces passed from CFX to ANSYS
  • Displacements passed from ANSYS to CFX

5
Fluid Geometry and Mesh
  • Flow domain generated by ANSYS Design Modeler
  • Computational mesh generated by ANSYS CFXMesh
  • 4 filter legs attached to vessel walls
  • 12 legs unattached
  • 150 K elements ¼ symmetry of model

6
Filter CFD analysis
  • Solid surfaces act as interface between fluid and
    solid domains
  • CFD solution provides unsteady pressure loads on
    solid surfaces
  • Solid deformations constitute new boundary for
    CFD
  • Two-way interactions, fully coupled iterative
    solutions at each time level

7
Inlet pressure pulse
Pressure 100mmHG Duration 1.0 s Analysis ends
at 1.5 s
8
CFD Analysis Results
  • Blood flow model
  • Density as a function of unsteady pressure pulse,
    weakly compressible
  • Non-Newtonian fluid
  • Moving mesh capability to accommodate deformed
    solid boundaries
  • Filter face and legs
  • Vessel wall

9
Deformation Fluid External Surfaces
10
Flow animations
11
Ansys Analysis Results - Deformations
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