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Comparison of Idealized and Realistic Inlet Velocity Profiles on Patient-Specific Aortic Blood Flow (CROSBI ID 730510)

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Milović, Philipp ; Karšaj, Igor ; Tuković, Željko Comparison of Idealized and Realistic Inlet Velocity Profiles on Patient-Specific Aortic Blood Flow // The 17th OpenFOAM Workshop (OFW 17) Cambridge, Ujedinjeno Kraljevstvo, 11.07.2022-14.07.2022

Podaci o odgovornosti

Milović, Philipp ; Karšaj, Igor ; Tuković, Željko

engleski

Comparison of Idealized and Realistic Inlet Velocity Profiles on Patient-Specific Aortic Blood Flow

Computational fluid dynamics has been widely used in hemodynamics research over the past decade, albeit to limited success, due to various modelling oversimplifications. Two common assumptions encountered in literature are that blood behaves like a Newtonian fluid and that blood flow is laminar. Consequently, it is common to prescribe the velocity profile of a developed, laminar, pulsatile flow of a Newtonian fluid as the inlet boundary condition, often referred to as the Womersley profile [1]. Although the Womersley profile is widely used, existing research suggests the presence of turbulence in vascular flows [2, 3], as well as an asymmetry of the velocity profile. It is also well known that blood exhibits shear-thinning [4], implying that a non- Newtonian model should be used. Considering the aforementioned, it is the aim of this research to assess the effects of assuming a Womersley-like profile, as opposed to simulating a realistic one, on the characteristics of a patient- specific aortic flow. The realistic velocity profile is obtained by simulating the turbulent flow of a non-Newtonian fluid through the left ventricle and the mitral and aortic valves. The Womersley-like profile is obtained by simulating the laminar, pulsatile flow of a Newtonian fluid through a pipe, and the flow rate is matched to that of the realistic case to facilitate comparison. The dynamic lumens of the left ventricle and the aorta are obtained from CT and ultrasound imagery [5]. Flow characteristics are compared at several stations downstream of the aortic valve and an assessment of the assumptions is made based on the obtained results.

hemodynamics ; patient-specific ; mesh motion ; FVM

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Podaci o skupu

The 17th OpenFOAM Workshop (OFW 17)

ostalo

11.07.2022-14.07.2022

Cambridge, Ujedinjeno Kraljevstvo

Povezanost rada

Strojarstvo