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Arterial Occlusion CFD Simulation

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The problem simulates blood flow in a clogged artery.

 

This ANSYS Fluent project includes CFD simulation files and a training movie.

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To order your ANSYS Fluent project (CFD simulation and training), contact our experts via info@mr-cfd.com, online support, or WhatsApp.

Description

Arterial Occlusion Project Description

The problem simulates arterial occlusion considering blood. The fluid used in the simulation process is blood, which has a density of 1060 kg.m-3 and a viscosity of 0.35 kg.m-1s-1. The flow rate of the blood flow to the artery from both inlet branches is 0.002385 kg.s-1 and the vessel wall is assumed to be static. A curvature line function has been used to define and plot the area of congestion in the vessel.

This function represents the sum of the points x and y that make up a curvature line obtained from the relation y = 0.0002475cos ((πx) /0.001). The curve is assumed to be 30% of the vessel’s congestion; This means that the ratio of the diameter of the vessel in the area with clogging to the diameter of the vessel is 0.7. The purpose of the study is to examine the behavior of blood flow inside the artery in an area with congestion and how to distribute the velocity and pressure within the artery.

Arterial Occlusion Geometry & Mesh

The present 2-D model is drawn using Design Modeler software. This model consists of a tube-shaped vessel with two branches that are connected to a branch in the form of a curved and clogged passage of fluid flow. The figure below shows a view of the geometry.

artery

The meshing is done using ANSYS Meshing software. The mesh type is structured and the element number is 85222. The following figure shows the mesh.

artery

CFD Simulation

To simulate the present model, we consider several assumptions, which are:

  • A pressure-based solver has been performed.
  • The present model is steady-state.
  • The effect of gravity on the fluid is not considered.

The following is a summary of the steps for defining the problem and its solution:

Models
Viscous model Laminar
Boundary conditions

 

(Arterial Occlusion)

Inlet 1, Inlet 2 Velocity inlet
velocity magnitude 0.002385 m.s-1
Outlet Pressure outlet
gauge pressure 0 Pascal
Walls Wall
wall motion stationary wall
Solution Methods

 

(Arterial Occlusion)

Pressure-velocity coupling   SIMPLE
Spatial discretization pressure second-order
momentum second-order upwind
Initialization (Arterial Occlusion)
Initialization method   Standard
velocity (x,y) 0 m.s-1
gauge pressure 0 pascal

Results

At the end of the solution process, we obtain two-dimensional pressure and velocity contours, as well as two-dimensional pathlines and vectors, and a velocity distribution diagram. Also, we present the chart of pressure, velocity, and pressure drop according to the percentage of clogged arteries. The changes in the percentage of clogged arteries are 30%, 40%, 50%, 60%, 70%, 80% and 90%, respectively.

 

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.

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