Sensitivity of flow simulations in a cerebral aneurysm

Area of Science:

• Biomedical Engineering
• Fluid Dynamics
• Medical Imaging Analysis

Background:

• Cerebral aneurysms pose a significant risk of rupture.
• Accurate simulation of hemodynamics within aneurysms is crucial for risk assessment.
• Patient-specific medical imaging provides a basis for realistic computational models.

Purpose of the Study:

• To simulate blood flow in an Anterior Communicating Artery aneurysm.
• To assess flow pattern sensitivity to outflow split and geometric parameters.
• To compare unsteady pulsatile and steady-state computational results.

Main Methods:

• Patient-specific medical imaging was used to create a computational model.
• Computational Fluid Dynamics (CFD) simulations were performed.
• Sensitivity analyses were conducted for outflow split and geometric variations.
• Unsteady pulsatile and steady-state flow computations were compared.

Main Results:

• No significant sensitivity of flow patterns to pulsatile flow-rate variations was observed.
• Both steady-state and pulsatile simulations indicated strong sensitivity to outflow split.
• Both simulation types demonstrated high sensitivity to geometric smoothing.
• Steady-state computations offer a viable approach for sensitivity analysis.

Conclusions:

• Hemodynamic sensitivity in cerebral aneurysms is primarily driven by outflow distribution and geometry, not pulsatility.
• Steady-state CFD simulations are adequate for extensive sensitivity studies.
• This sensitivity analysis can be leveraged for improved aneurysm rupture prediction.