Experimental and numerical study of the effect of pulsatile flow on wall displacement oscillation in a flexible lateral aneurysm model

Mu, Lizhong; Li, X. Y.; Z., Q.; Yang, Shaoran; Zhang, P. D.; Ji, Chengcheng; He, Ying; Gao, Ge

doi:10.1007/s10409-019-00893-8

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…Second, the WSS and pressure drop in the rigid aorta case with vascular wall compliance may be different from that without vascular wall compliance [37]. Vascular wall compliance and pulsatile blood flow can lead to oscillations in the wall displacement, as reported by Mu et al [38]. Moreover, fluid-structure interaction can result in low oscillatory shear stress distribution.…”

Section: Discussionmentioning

confidence: 91%

Study of Effect of Boundary Conditions on Patient-Specific Aortic Hemodynamics

Chi¹,

Chen²,

Yang³

et al. 2022

Computer Modeling in Engineering &Amp; Sciences

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Cardiovascular computational fluid dynamics (CFD) based on patient-specific modeling is increasingly used to predict changes in hemodynamic parameters before or after surgery/interventional treatment for aortic dissection (AD). This study investigated the effects of flow boundary conditions (BCs) on patient-specific aortic hemodynamics. We compared the changes in hemodynamic parameters in a type A dissection model and normal aortic model under different BCs: inflow from the auxiliary and truncated structures at aortic valve, pressure control and Windkessel model outflow conditions, and steady and unsteady inflow conditions. The auxiliary entrance remarkably enhanced the physiological authenticity of numerical simulations of flow in the ascending aortic cavity. Thus, the auxiliary entrance can well reproduce the injection flow from the aortic valve. In addition, simulations of the aortic model reconstructed with an auxiliary inflow structure and pressure control and the Windkessel model outflow conditions exhibited highly similar flow patterns and wall shear stress distribution in the ascending aorta under steady and unsteady inflow conditions. Therefore, the inflow structure at the valve plays a crucial role in the hemodynamics of the aorta. Under limited time and calculation cost, the steady-state study with an auxiliary inflow valve can reasonably reflect the blood flow state in the ascending aorta and aortic arch. With reasonable BC settings, cardiovascular CFD based on patient-specific AD models can aid physicians in noninvasive and rapid diagnosis.

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Section: Discussionmentioning

confidence: 91%

Study of Effect of Boundary Conditions on Patient-Specific Aortic Hemodynamics

Chi¹,

Chen²,

Yang³

et al. 2022

Computer Modeling in Engineering &Amp; Sciences

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show abstract

“…[5] to different problems and different model reduction techniques. Finally, we are interested in improving the full order model, by considering turbulence effects (see, e.g., [31,32]), as well as coupling the fluid model with an elasticity model to simulate fluid-structure interaction (FSI) (see, e.g., [18,[33][34][35]). This would make the presented pipeline more complete and versatile.…”

Section: Discussionmentioning

confidence: 99%

Non-intrusive data-driven ROM framework for hemodynamics problems

et al. 2021

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Reduced order modeling (ROM) techniques are numerical methods that approximate the solution of parametric partial differential equation (PED) by properly combining the high-fidelity solutions of the problem obtained for several configurations, i.e. for several properly chosen values of the physical/geometrical parameters characterizing the problem. By starting from a database of high-fidelity solutions related to a certain values of the parameters, we apply the proper orthogonal decomposition with interpolation (PODI) and then reconstruct the variables of interest for new values of the parameters, i.e. different values from the ones included in the database. Furthermore, we present a preliminary web application through which one can run the ROM with a very user-friendly approach, without the need of having expertise in the numerical analysis and scientific computing field. The case study we have chosen to test the efficiency of our algorithm is represented by the aortic blood flow pattern in presence of a left ventricular (LVAD) assist device when varying the pump flow rate.

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“…Poisson coupling and friction coupling can greatly influence junction coupling, and, in turn, junction coupling has a greater impact on the pipeline system than Poisson coupling [11,12], which is derived from the findings of the study conducted at the University of Dundee. By extension, Forbes and Stephen [13,14] studied the response of fixed straight, J-shaped, and complex pipes on both ends of a pipeline in frequency domain, and experimentally verified the correctness of their findings. Davidson and Smith [15] designed a single elbow with one fixed end and one free end.…”

mentioning

confidence: 85%

Fluid-Structure Interaction Response of a Water Conveyance System with a Surge Chamber during Water Hammer

Guo

Zhou

et al. 2020

Water

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Fluid-structure interaction (FSI) is a frequent and unstable inherent phenomenon in water conveyance systems. Especially in a system with a surge chamber, valve closing and the subsequent water level oscillation in the surge chamber are the excitation source of the hydraulic transient process. Water-hammer-induced FSI has not been considered in preceding research, and the results without FSI justify further investigations. In this study, an FSI eight-equation model is presented to capture its influence. Both the elbow pipe and surge chamber are treated as boundary conditions, and solved using the finite volume method (FVM). After verifying the feasibility of using FVM to solve FSI, friction, Poisson, and junction couplings are discussed in detail to separately reveal the influence of a surge chamber, tow elbows, and a valve on FSI. Results indicated that the major mechanisms of coupling are junction coupling and Poisson coupling. The former occurs in the surge chamber and elbows. Meanwhile, a stronger pressure pulsation is produced at the valve, resulting in a more complex FSI response in the water conveyance system. Poisson coupling and junction coupling are the main factors contributing to a large amount of local transilience emerging on the dynamic pressure curves. Moreover, frictional coupling leads to the lower amplitudes of transilience. These results indicate that the transilience is induced by the water hammer-structure interaction and plays important roles in the orifice optimization in the surge chamber.Keywords: fluid-structure interaction; pipe flow; finite volume method; water hammer; transient flow IntroductionPipes conveying fluid are prevalent in many fields, including marine, civil engineering, nuclear power industries, petroleum, and water conservancy systems in daily life [1]. As an inherent phenomenon, fluid-structure interaction (FSI) always occurs in water conveyance pipelines [2][3][4]. Because of the existence of FSI, those pipes with few supports or thin walls show poor robustness, where the FSI of pipes is enhanced [5]. Therefore, the FSI responses must be considered when analyzing the characteristics of water conveyance systems [6]. The types of coupling that occur between the pipeline and fluid mainly include friction coupling, Poisson coupling, and junction coupling, among which the former two coupling take place throughout the whole pipeline. However, the last one only happens locally in pipes, including in elbows, branches, valves, boundaries, and variable cross sections [7], where the system coupling is much stronger [8]. Amongst these three coupling forms, friction coupling has the weakest response and shows changes in its magnitude over a long period [9]. Meanwhile, as the most important coupling form, junction coupling produces a pressure head larger Water 2020, 12, 1025 2 of 18 than the classical water hammer, and greatly depends on the robustness of the system [10]. Poisson coupling and friction coupling can greatly influence junction coupling, and, in turn, junction coupling ...

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Experimental and numerical study of the effect of pulsatile flow on wall displacement oscillation in a flexible lateral aneurysm model

Cited by 11 publications

References 25 publications

Study of Effect of Boundary Conditions on Patient-Specific Aortic Hemodynamics

Study of Effect of Boundary Conditions on Patient-Specific Aortic Hemodynamics

Non-intrusive data-driven ROM framework for hemodynamics problems

Fluid-Structure Interaction Response of a Water Conveyance System with a Surge Chamber during Water Hammer

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