Non-Newtonian Blood Flow in a Clogged Vessel CFD Simulation, ANSYS Fluent

$121.00 Student Discount

The present problem simulates non-Newtonian blood flow within a clogged vessel using ANSYS Fluent software.

This product includes Geometry & Mesh file and a comprehensive Training Movie.

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The journal file in ANSYS Fluent is used to record and automate simulations for repeatability and batch processing.
editable geometry and mesh allows users to create and modify geometry and mesh to define the computational domain for simulations.
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Geometry, Mesh, and CFD Simulation methodologygy explanation, result analysis and conclusion
The MR CFD certification can be a valuable addition to a student resume, and passing the interactive test can demonstrate a strong understanding of CFD simulation principles and techniques related to this product.


Project Description

The present problem simulates blood flow within a clogged vessel using ANSYS Fluent software. Fluids are divided into two categories according to their viscosity: Newtonian and non-Newton fluids. Viscosity of a fluid is a parameter that indicates the resistance of that fluid to flow. Newtonian fluids are fluids that follow Newton’s law of viscosity (shear stress in a Newtonian fluid changes linearly with strain rate) and also their viscosity depends only on the temperature and pressure of the fluid and by applying force to them in constant temperature and pressure, their viscosity does not change.

Non-Newtonian fluids, on the other hand, are fluids that do not follow Newton’s law of fluids, and their viscosity changes with the application of force. In this simulation, blood with a density of 1050 kg.m-3 is used as a fluid that is considered a non-Newtonian fluid. Therefore, the Carreau equation model is used to define the fluid viscosity in the software. In this model, the viscosity value at zero shear stress is defined as 0.022 kg.m-1.s-1 and the viscosity at initial shear stress is defined as 0.0022 kg.m-1.s-1. Blood flow enters the vessel at a rate equivalent to 0.25 m.s-1 and exits at a pressure equivalent to atmospheric pressure. The equation of the Carreau model is defined as follows:


Clogged Vessel Geometry & Mesh

The present model is designed in two dimensions using Design Modeler software. The model is designed as a symmetrical part of a three-dimensional model that includes an inlet and an outlet and a recessed wall.


The meshing of the model has been done using ANSYS Meshing software and the mesh type is unstructured. The element number is 5302. The following figure shows the mesh.


Non-Newtonian Flow CFD Simulation

To simulate the present model, we consider several assumptions:

  • We perform a pressure-based solver.
  • The simulation is unsteady.
  • The gravity effect on the fluid is equal to -9.81 m.s-2 along the Y-axis.

A summary of the defining steps of the problem and its solution is given in the following table:

Viscous k-epsilon
Boundary conditions
Inlet Velocity Inlet
velocity magnitude 0.25 m.s-1
Outlet Pressure Outlet
gauge pressure 0 pascal
Walls Wall
wall motion stationary wall
Pressure-Velocity Coupling SIMPLE
Pressure second order
momentum second order upwind
Initialization methods Standard
gauge pressure 0 pascal
axial velocity 0.25 m.s-1
radial velocity 0 m.s-1


At the end of the solution process, we obtain two-dimensional contours related to pressure and velocity as well as diagrams of changes in pressure and velocity along the central axis of the model and diagrams of shear stress changes in the wall along the outer surface of the vessel wall.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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