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Fluid-Structure Interaction

Hypergravity and Multiple Reflections in Wave Propagation in the Aorta

[+] Author and Article Information
C. G. Giannopapa

e-mail: c.g.giannopapa@tue.nl
Department of Mathematics
and Computer Science
Eindhoven University of Technology
P.O. Box 513
5600 MB Eindhoven, The Netherlands

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 12, 2010; final manuscript received December 12, 2011; published online November 28, 2012. Assoc. Editor: Jong Chull Jo.

J. Pressure Vessel Technol 135(1), 011301 (Nov 28, 2012) (7 pages) Paper No: PVT-10-1174; doi: 10.1115/1.4007187 History: Received December 12, 2010; Revised December 12, 2011

Hypergravity and gravity changes encountered in, e.g., airplanes, rollercoasters, and spaceflight can result in headaches or loss of consciousness due to decreased cerebral blood flow. This paper describes the effect of hypergravity and gravity changes on the pressure in the aorta and the distension of its wall. The model presented consists of a pressure part caused by gravity and a part representing pressure waves propagating through the vessel. The total pressure is described by a one-dimensional formulation in the frequency domain. To accommodate for geometrical and material variations, the vessel is modeled as a series of sections in which multiple reflections can occur. Results are presented for constant and varying gravity in straight and tapered flexible vessels.

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References

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Figures

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Fig. 1

Vertical vessel with multiple sections

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Fig. 2

Four waves arriving in section n

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Fig. 3

Dimensions of tube S and tube T (in millimeter)

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Fig. 4

Pressure evolution in straight tube S, at different axial positions, in case of no gravity (dashed lines) and with constant gravity (solid lines)

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Fig. 5

Wall displacement evolution in straight tube S, at different axial positions, in case of no gravity (dashed lines) and with constant gravity (solid lines)

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Fig. 6

Pressure evolution in tapered tube T, at different axial positions, in case of no gravity (dashed lines) and with constant gravity (solid lines)

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Fig. 7

Wall displacement evolution in tapered tube T, at different axial positions, in case of no gravity (dashed lines) and with constant gravity (solid lines)

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Fig. 8

Time-dependent gravity, ramped profile

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Fig. 9

Pressure evolution in straight tube S, at different axial positions, in case of no gravity (dashed lines) and with time-dependent gravity (solid lines)

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Fig. 10

Wall displacement evolution in straight tube S, at different axial positions, in case of no gravity (dashed lines) and with time-dependent gravity (solid lines)

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Fig. 11

Pressure evolution in tapered tube T, at different axial positions, in case of no gravity (dashed lines) and with time-dependent gravity (solid lines)

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Fig. 12

Wall displacement evolution in tapered tube T, at different axial positions, in case of no gravity (dashed lines) and with time-dependent gravity (solid lines)

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