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Convergence of Phase-Averaged, Transitional Flow in an Abdominal Aortic Aneurysmal Model
Hyun Jin Kim1, Chang Min Lee1, Hans Christian Rundfeldt2
1Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea.
Investigating blood flow in abdominal aortic aneurysms reveals transitional flow characteristics. Phase-averaged solutions over many cardiac cycles are crucial for accurately representing disturbed blood flow patterns.
Area of Science:
- * Fluid Dynamics
- * Biomedical Engineering
- * Cardiovascular Science
Background:
- * Abdominal aortic aneurysms (AAAs) can display complex transitional flow patterns.
- * Understanding these flow dynamics is critical for clinical assessment and treatment.
Purpose of the Study:
- * To examine the convergence of phase-averaged solutions for transitional flow in a patient-specific AAA model.
- * To determine the optimal number of cardiac cycles for accurate simulation of disturbed blood flow.
Main Methods:
- * Executed blood flow simulations on a patient-specific abdominal aortic aneurysm model.
- * Simulations were run for 257 cardiac cycles using pulsatile boundary conditions.
- * Phase-averaged solutions were computed and compared across varying numbers of cardiac cycles.
Main Results:
- * Phase-averaged solutions showed minimal differences when averaged over a large number of cardiac cycles.
- * Instantaneous solutions did not capture the fluctuations observed in phase-averaged data.
- * Convergence of phase-averaged solutions was achieved with extended averaging periods.
Conclusions:
- * Phase-averaged solutions are essential for characterizing nonperiodic, disturbed blood flow in aneurysms.
- * Averaging over a large number of cardiac cycles is preferred for converged phase-averaged solutions.
- * Accurate representation of transitional blood flow requires careful consideration of simulation duration and averaging techniques.
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