Physics Setup

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Setup

Watch the following video for demonstrations:

<iframe width="600" height="338" src="//www.youtube.com/embed/dVjMBGLzDfM" frameborder="0" allowfullscreen></iframe>

Summary for the video:

1. General -> Change from "steady" to "transient"
2. Materials -> Fluid -> Change "Name" to "Blood" -> Change "Density" to 1060 kg/m^3 -> Select "Carreau" for Viscosity

Details for Carreau Model:

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Coefficients:

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Input Value

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Time Constant, lambda (s)

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3.313

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Power-Law Index n

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0.3568

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Zero Shear Viscosity (kg/m-s)

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0.056

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Infinite Shear Viscosity (kg/m-s)

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0.0035

how to set up the physics in Fluent:

Version Change Note: Change flow regime to laminar, because default flow regime is Viscous k-omega. Open Model Drop-down → Double-click on 3rd option → Select "Laminar" → Click OK. See screenshot below.

Image Added

Boundary Conditions

CLICK HERE to download the User Defined Function (UDF) file used in this tutorial.

Watch the following video for demonstrations:

<iframe width="600" height="338" src="//www.youtube.com/embed/dZvsDNPqs9E" frameborder="0" allowfullscreen></iframe>

Summary for the video:

1. UDF: Define -> User Defined -> Functions -> Interpreted.
2. Boundary Conditions -> Inlet -> Velocity Inlet -> Edit -> Velocity Magnitude -> Change "Constant" to "udf inlet_velocity".
3. Outlet1 -> Pressure Outlet -> Edit -> Gauge Pressure 13332.
4. Outlet2 same as outlet1. 

For ANSYS 19.2, follow the steps below

1. User Defined>Functions>Compiled
2. Add UDF file vinlet_udf.c>Build>Read
3. Boundary Conditions>Inlet>Velocity Inlet> Edit>Velocity Magnitude>Change "Constant" to "udf inlet_velocity".
4. Outlet1>Pressure Outlet>Edit>Gauge Pressure 13332
5. Outlet2 same as outlet1

Particle Tracking:

The motivation for tracking the particles here is to setup for creating particle trajectories later on.

Watch the following video for demonstrations:

<iframe width="600" height="338" src="https://www.youtube.com/embed/FSp6uvbBJp4Ys2HWQBvuWk" frameborder="0" allowfullscreen></iframe>

Summary for the video:

1. Define -> Injections -> Create -> Change "Particle Type" to Massless -> Input the coordinates (see the table below)
2. Repeat the steps above to inject another particle (or more, if you like) 

For ANSYS 19.2, follow the steps below

1. Setting Up Physics>Model Specific>Discrete Phase Models>Injections
2. Injections>Create>Change "Particle Type" to Massless>Input the coordinates (see the table below)
3. Repeat the steps above to inject another particle

Summary of coordinates for example injections:

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Injection

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x coordinates

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y coordinates

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z coordinates

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injection-0

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0.001183

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0.006242

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-0.0318313

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injection-1

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0.002758

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0.004548

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-0.0318313

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