Influence of Blood Rheology and Turbulence Models in the Numerical Simulation of Aneurysms

Figures

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  Figure 1. Aneurysm geometries, mean size, flow direction (red arrows) and meshes under study.

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  Figure 2. Mesh independence test of the area-averaged WSS as a function of time for the whole surface for all cases.

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  Figure 3. Hemodynamic indices studied in IA. (A) WSS in peak diastole, (B) WSS in peak systole, (C) TAWSS, (D) OSI, (E) RRT, and (F) GON. The circled areas shown the zone with the maximum value for each variable.

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  Figure 4. Hemodynamic indices studied in AAA1. (A) WSS in peak Diastole, (B) WSS in peak systole (C) TAWSS, (D) OSI, (E) RRT and (F) GON.

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  Figure 5. OSI results of Newtonian and non-Newtonian models. (A) Newtonian, (B) Crreau, (C) Casson, (D) power law, (E) Newtonian–Carreau differences, (F) Newtonian–Casson differences, (G) Newtonian–power law differences.

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  Figure 6. Velocity plane contour. (A) Plane, (B) Newtonian model, (C) Carreau model, (D) Newtonian–Carreau differences.

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  Figure 7. OSI results for different cycles for aortic and intracranial aneurysms.

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  Figure 8. Hemodynamic parameters under study for (A) Laminar—Newtonian, (B) k−ϵ—Newtonian, (C) k−ϵ—Carreau, (D) k−ϵ—Casson, (E) k−ϵ—power law. (F) Differences between Laminar—Newtonian and k−ϵ—Newtonian, (G) differences between Laminar—Newtonian and k−ϵ—Carreau, (H) differences between Laminar—Newtonian and k−ϵ—Casson, (I) differences between Laminar—Newtonian and k−ϵ—power law.

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  Figure 9. Newtonian value of OSI at different cycles.

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  Figure 10. OSI results of Newtonian and non-Newtonian models, comparing turbulence models. (A) Newtonian laminar, (B) Newtonian KE, (C) Carreau KE, (D) Casson KE, (E) power law—KE, (F) Newtonian laminar—Newtonian KE differences, (G) Newtonian laminar—Carreau KE differences, (H) Newtonian laminar—Casson KE differences, (I) Newtonian laminar—power law KE differences.

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  Figure 11. Camparison of rigid and elastic wall. (A) OSI values of rigid, laminar, and Newtonian case. (B) OSI values of elastic, laminar, and Newtonian case. (C) OSI differences between rigid and elastic wall. (D) TAWSS values of rigid, laminar, and Newtonian case. (E) TAWSS values of elastic, laminar, and Newtonian case. (F) TAWSS differences between rigid and elastic wall.

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  Figure 12. TAWSS in peak diastole, peak systole, TAWSS, and OSI area-averaged (blue star) results in AAA2 under rheological, turbulence, and elastic models studied.