Iranian Journal of Mechanical Engineering Transactions of ISME

Iranian Journal of Mechanical Engineering Transactions of ISME

3D Blood Flow Simulation in Artificial Heart with Double Volute using Dynamic Mesh Method

Authors
Nazila Nematzadeh 1
Jafar Ghazanfarian 2
1 Department of Mechanical Engineering, Engineering Faculty, Zanjan Univ.,
2 Department of Mechanical Engineering, Faculty of engineering, Department, Zanjan Univ., Iran
Abstract
The two dimensional and three dimensional numerical simulation of blood flow in a centrifugal pump with 16 radial blades placed on a magnetically suspended impeller have been presented. The results of simulation for the pump of model Kyoto-NTN have been obtained using multi-reference frame (MRF), sliding mesh, and dynamic mesh methods. With the assumption of incompressible flow and Newtonian fluid, the blood flow is simulated in an unsteady turbulent manner using collocated finite volume method over unstructured grids. The results showed that with the rotational speed of 2000 round per minute, the capacity and pressure difference of pump are 5 l/min and 15.1 kPa, respectively. Results including the pressure distribution, the velocity vectors, the flow pattern, the shear stress contours, and the pump characteristics illustrated that using the double spiral shaped volute leads to the symmetrical pressure distribution around the surface of impeller, and consequently, the reduction of radial thrust. The maximum wall shear stress is observed near the cutwater splitter leading edge and blade leading edges. So, these regions are highly at the risk of Hemolysis. Finally, the results of simulation obtained from two and three dimensional modeling with various moving boundary capturing methods have been presented and compared.
Keywords
3D
Dynamic Mesh Concept
Centrifugal Blood Pump
hemolysis
Double Volute

Subjects

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Iranian Journal of Mechanical Engineering Transactions of ISME
Volume 19, Issue 2 - Serial Number 47
Fluid Mechanics and Heat Transfer
Autumn 2016
Pages 6-22

  • Receive Date 22 March 2016
  • Revise Date 12 August 2016
  • Accept Date 03 October 2017