# Comsol exercise 1

Learning Goal: I’m working on a engineering multi-part question and need an explanation and answer to help me learn.

Hello,

I need someone who is experienced in using COMSOL software to help me with this assignment and the report. I have attached everything in the Bottom. You have to have COMSOL installed in your Laptop to do this assignment.

To examine how a stenosis affects the regional blood flow, we are to model the blood flow through an

arterial segment with and without stenosis. The length of the arterial segment is 50 mm and the diameter of

its inner lumen is 3 mm. First model the case without stenosis. For the disease case, consider the stenosis is

at the midway of the flow path and its geometry can be approximated as a semi-circular cross section with a

radius of 0.75 mm (the radius of the fillet is 0.5 mm). With axi-symmetry and laminar flow assumptions,

we consider the blood has the following physical properties:

 Blood density (ρ) = 1,050 kg/m3

 Dynamic viscosity (µ) of the blood = 3.5 x 10-3 Pa-sec or 3.5 cp

The pressure at the inlet of the arterial segment is at 80 mmHg (10.6 kPa), which drops to 60 mmHg (8 kPa)

at the outlet. We are to consider three reference locations: Positions 1, 2, 3 are at 12.5, 25, and 37.5 mm

respectively from the inlet of the arterial segment.

1. Use color contour plots to map out the velocity in the entire lumen. Use zoom-in view to highlight

the changes in the region near stenosis

2. Make streamline plots for the entire domain, then use zoom-in view to highlight the changes at

regions before and post the stenosis.

3. Plot the velocity profiles at Positions 1, 2 and 3

4. Use vector plots to show the variation in fluid velocity along the diameter at Position 1, 2, and 3.

5. Plot the shear stress profiles at Positions 1, 2 and 3

6. Plot the pressure drops from the inlet to the outlet

Compare each of the results between the stenosed and non-stenosed case, discu ss how the stenosis affect

the flow parameters

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