Experimental and numerical investigation of flow field in flexible tube

conference paper

en

The flexibility of walls influences the flow field in the cardiovascular system. The most of the existing experimental and numerical biomechanics work always tried to resolve this problem with rigid walls. In this work, an experimental simulation with the flexible wall will be carried out and the experimental data will be compared to the numerical solution. The aim of this work was to determine the influence of an elastic tube on final qualities of velocity profiles. Velocity profiles and deformations of the tube in the radial direction for any given time are the outcomes of this contribution. A high-speed camera was used in the experimental part of this work. The high-speed camera recordings enable to simultaneously detect the deformation of the flexible wall. The flexible tube was made of Tygon – a transparent material. Material parameters of Tygon were obtained from the uniaxial tensile test. The liquids used in the experimental measurement were air and water. The measurement was done for constant and pulsating volume flow. A pressure pulse generator was used to generate pulsatile flow. The computational simulation took advantage of the capability of commercial numerical solvers coupling between finite volume method CFD solution and finite element method mechanical solution. This approach is generally known as Fluid-structure interaction (FSI). Boundary conditions for numerical simulation were taken from measurement for reliable comparison of experimental and numerical results.

The flexibility of walls influences the flow field in the cardiovascular system. The most of the existing experimental and numerical biomechanics work always tried to resolve this problem with rigid walls. In this work, an experimental simulation with the flexible wall will be carried out and the experimental data will be compared to the numerical solution. The aim of this work was to determine the influence of an elastic tube on final qualities of velocity profiles. Velocity profiles and deformations of the tube in the radial direction for any given time are the outcomes of this contribution. A high-speed camera was used in the experimental part of this work. The high-speed camera recordings enable to simultaneously detect the deformation of the flexible wall. The flexible tube was made of Tygon – a transparent material. Material parameters of Tygon were obtained from the uniaxial tensile test. The liquids used in the experimental measurement were air and water. The measurement was done for constant and pulsating volume flow. A pressure pulse generator was used to generate pulsatile flow. The computational simulation took advantage of the capability of commercial numerical solvers coupling between finite volume method CFD solution and finite element method mechanical solution. This approach is generally known as Fluid-structure interaction (FSI). Boundary conditions for numerical simulation were taken from measurement for reliable comparison of experimental and numerical results.

fluid-structure interaction, flexible wall, computational simulation, wall deformation

28.03.2019

1755-1315

IOP Conference Series: Earth and Environmental Science

240

1–7

7