Key result
Compared to 3-velocity component MRI data, Womersley inlet methods yielded lower helical flow index (28%), mean wall shear stress (71%), and oscillatory index (56%).
Inlet methods based on center line velocity significantly simplify abdominal aortic aneurysm hemodynamics and are not recommended; 2D MRI velocity profiles with 3-velocity component data are preferred to fully account for helical flow.
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Caution against Womersley inlets in AAA CFD models; animal data leaves open validation with human 3-component 4D-flow MRI.
Hardman et al. (2012) studied Abdominal aortic aneurysm disease. Womersley and 1-component velocity (1CV) inlet boundary conditions vs. 3-component velocity (3CV) inlet data was evaluated on Quantitative indices (helical flow index, mean wall shear stress, oscillatory index). Compared to 3-velocity component MRI data, Womersley inlet methods yielded lower helical flow index (28%), mean wall shear stress (71%), and oscillatory index (56%).
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