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Blood flow in a Cerebral Aneurysm
Posted Dec 2, 2020, 11:11 a.m. EST 1 Reply
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Good morning, I'm simulating the blood flow in a brain aneurysm. I made a 2D geometry as if I were considering the central slice of the 3D structure (figure1), where the internal domain is blood and the two external domains are the artery. I set the following boundary conditions: I consider a laminar flow, with a pulsatile flow rate at the inlet as in figure 2 and at the outlet with zero static pressure. For the material properties I inserted a blood with 1060kg/m³ density and a dynamic viscosity of 0.0036 Pas, while the artery properties are in figure 3. The study selected is 'FluidSolid Interaction, Fixed Geometry'. I did a stationary study (with all default parameters) but there is the following error: "Failed to find a solution. Maximum number of segregated iterations reached. Returned solution is not converged. Not all parameter steps returned."
if someone can help me, I will be grateful. Thanks a lot.
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Hello Miriam,
I can't help but notice that your figure 1 shows a 2D axisymmetric geometry. I don't believe that's what you meant to do as it would not correspond to the central slice of a blood vessel with an aneurysm (One of the conditions required for 2D axisymmetry to be suitable is that the geometry be invariant about the r=0 axis). Even if you had used a 2D geometry, you couldn't expect that the simulation will yield any insight into the real 3D flow, since a blood vessel is not close to being infinitely invariant in the direction perpendicular to the screen. 3D is going to be a must for modeling this flow. Here is an example you can use as a starting point for your own modeling.
Best regards,
Jeff
-------------------Jeff Hiller