Computational fluid dynamics-based study of possibility of generating pulsatile blood flow via a continuous-flow VAD

2016 ◽  
Vol 55 (1) ◽  
pp. 167-178 ◽  
Author(s):  
Erfan Nammakie ◽  
Hanieh Niroomand-Oscuii ◽  
Mojtaba Koochaki ◽  
Farzan Ghalichi
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Flow ◽  
Continuous Flow ◽  
Pulsatile Blood Flow

scholarly journals A Simple Transient Poiseuille-Based Approach to Mimic the Womersley Function and to Model Pulsatile Blood Flow

Dynamics ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 9-17
Author(s):  
Andrea Natale Impiombato ◽  
Giorgio La Civita ◽  
Francesco Orlandi ◽  
Flavia Schwarz Franceschini Zinani ◽  
Luiz Alberto Oliveira Rocha ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Flow ◽  
Boundary Conditions ◽  
Quadratic Function ◽  
Pulsatile Blood Flow ◽  
Flow Through ◽  
Simplified Analysis ◽  
Function Models ◽  
Flow Reversals

As it is known, the Womersley function models velocity as a function of radius and time. It has been widely used to simulate the pulsatile blood flow through circular ducts. In this context, the present study is focused on the introduction of a simple function as an approximation of the Womersley function in order to evaluate its accuracy. This approximation consists of a simple quadratic function, suitable to be implemented in most commercial and non-commercial computational fluid dynamics codes, without the aid of external mathematical libraries. The Womersley function and the new function have been implemented here as boundary conditions in OpenFOAM ESI software (v.1906). The discrepancy between the obtained results proved to be within 0.7%, which fully validates the calculation approach implemented here. This approach is valid when a simplified analysis of the system is pointed out, in which flow reversals are not contemplated.

Computational Fluid Dynamics (CFD) Study of the 4th Generation Prototype of a Continuous Flow Ventricular Assist Device (VAD)

2004 ◽  
Vol 126 (2) ◽  
pp. 180-187 ◽  
Author(s):  
Xinwei Song ◽  
Houston G. Wood ◽  
Don Olsen
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Flow ◽  
Ventricular Assist Device ◽  
Continuous Flow ◽  
Surrounding Tissue ◽  
Assist Device ◽  
Ventricular Assist ◽  
Wide Range ◽  
Computational Fluid Dynamics Cfd

The continuous flow ventricular assist device (VAD) is a miniature centrifugal pump, fully suspended by magnetic bearings, which is being developed for implantation in humans. The CF4 model is the first actual prototype of the final design product. The overall performances of blood flow in CF4 have been simulated using computational fluid dynamics (CFD) software: CFX, which is commercially available from ANSYS Inc. The flow regions modeled in CF4 include the inlet elbow, the five-blade impeller, the clearance gap below the impeller, and the exit volute. According to different needs from patients, a wide range of flow rates and revolutions per minute (RPM) have been studied. The flow rate-pressure curves are given. The streamlines in the flow field are drawn to detect stagnation points and vortices that could lead to thrombosis. The stress is calculated in the fluid field to estimate potential hemolysis. The stress is elevated to the decreased size of the blood flow paths through the smaller pump, but is still within the safe range. The thermal study on the pump, the blood and the surrounding tissue shows the temperature rise due to magnetoelectric heat sources and thermal dissipation is insignificant. CFD simulation proved valuable to demonstrate and to improve the performance of fluid flow in the design of a small size pump.

Computational Fluid Dynamics of Carotid Artery Blood Flow for Low-Gravity Environments

2021 ◽  
pp. 111-119
Author(s):  
Vishwajeet Shankhwar ◽  
Dilbag Singh ◽  
Renuka Garg ◽  
Kamleshwar Kumar Verma ◽  
K.K. Deepak
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Flow ◽  
Carotid Artery ◽  
Artery Blood Flow ◽  
Low Gravity

Computational Fluid Dynamics-Based Blood Flow Assessment Facilitates Optimal Management of Portal Vein Stenosis After Liver Transplantation

2019 ◽  
Vol 24 (2) ◽  
pp. 460-461
Author(s):  
Satoshi Ogiso ◽  
Masanori Nakamura ◽  
Takashi Tanaka ◽  
Kenji Komiya ◽  
Hideya Kamei ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Liver Transplantation ◽  
Blood Flow ◽  
Portal Vein ◽  
Optimal Management ◽  
Portal Vein Stenosis ◽  
Vein Stenosis

scholarly journals 953: Distribution of ductus venosus blood flow using computational fluid dynamics on fetal heart virtual models

2020 ◽  
Vol 222 (1) ◽  
pp. S591-S592
Author(s):  
Lucille E. Anzia ◽  
Ryan Pewowaruk ◽  
Katrina L. Ruedinger ◽  
Barbara Trampe ◽  
Timothy Heiser ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Blood Flow ◽  
Fetal Heart ◽  
Ductus Venosus ◽  
Virtual Models
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