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  • 3D Bifurcating Artery (steady) - Exercises

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In order to implement this file in FLUENT, in the top menu bar, under "Define" -> "User Defined" -> "Functions", choose "Interpreted". Find the .c file in the directory, and choose "Interpret". Then under materials, double click on the fluid you defined, and for viscosity, choose "User Defined". Then choose "casson_viscosity". You assign the inlet velocity as in the tutorial. 

 

 Note that the results shown at end in the following video are for the pipe flow problem, not the bifurcating artery. This is for illustration purposes only. You would need to check yourself how your original results for the bifurcating artery change when you implement the Casson model. 


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<iframe width="560" height="315" src="https://www.youtube.com/embed/OXeF-0_dET4" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

 

 

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 Info
The following videos go through the steps for modifying the bifurcating artery geometry in ANSYS SpaceClaim. For instructions on modifying the geometry using SolidWorks, see the page 3D Bifurcating Artery - Exercises (Legacy).
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Watch the following video for a demonstration of how to add obstructions to the original artery geometry using ANSYS SpaceClaim.
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    1. Edit Model in SpaceClaim
    2. File > SpaceClaim Options > Set Minimum Grid Spacing to 0.1mm
    3. Place a point where you want the centroid of the obstruction located
    4. Merge the surrounding faces using Repair > Merge Faces
    5. Hide Artery
    6. Sketch an ellipse on XZ plane
      1. Major axis length (along Z): 12mm
      2. Minor axis length (along X): 4mm
    7. Pull > Select the Z axis > Click the |> button
    8. Move > Up to > Click on the Point from earlier
    9. Unhide Artery and make sure ellipsoid is properly sized and positioned
      1. Use Pull > Scale to resize the ellipsoid
      2. Use Move to reposition the ellipsoid using the directional or orientational handles
    10. Click Combine
    11. Click the artery, then the ellipsoid (should result in three solids)
    12. Delete or suppress all entities except the artery
    13. Click Pull, click on the edge of the resulting depression and create a fillet
    14. If you need to restart for any reason, simply CTRL + click the depression and the fillet and then click Fill (make sure you click the green checkmark that is on the screen)
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Watch the following video for a demonstration of how to add a stent to the original artery geometry using ANSYS SpaceClaim. You will need to suppress the solid created to generate the effect of the stent before opening the geometry in the mesher. 
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