Experimental Study on a Fluid-Structure Interaction Reference Test Case

Gomes, Jorge; Lienhart, H.

doi:10.1007/3-540-34596-5_14

Cited by 18 publications

(17 citation statements)

References 3 publications

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“…3.5 showed good agreement (see. [10]) with the experimental setup presented by Gomes et al [83], in which a cylindrical body with an elastic thin plate attached to it starts to swivel due to a fluid flow from one side.…”

Section: Model Verificationmentioning

confidence: 99%

Mathematical Models and Numerical Schemes for the Simulation of Human Phonation

Alipour¹,

Brücker²,

Cook³

et al. 2011

CBIO

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Acoustic data has long been harvested in fundamental voice investigations since it is easily obtained using a microphone. However, acoustic signals alone do not reveal much about the complex interplay between sound waves, structural surface waves, mechanical vibrations, and fluid flow involved in phonation. Available high speed imaging techniques have over the past ten years provided a wealth of information about the mechanical deformation of the superior surface of the larynx during phonation. Time-resolved images of the inner structure of the deformable soft tissues are not yet feasible because of low temporal resolution (MRI and ultrasound) and x-ray dose-related hazards (CT and standard xray). One possible approach to circumvent these challenges is to use mathematical models that reproduce observable behavior such as phonation frequency, closed quotient, onset pressure, jitter, shimmer, radiated sound pressure, and airflow. Mathematical models of phonation range in complexity from systems with relatively small degrees of freedom (multi-mass models) to models based on partial differential equations (PDEs) mostly solved by finite element (FE) methods resulting in millions of degrees-of-freedom. We will provide an overview about the current state of mathematical models for the human phonation process, since they have served as valuable tools for providing insight into the basic mechanisms of phonation and may eventually be of sufficient detail and accuracy to allow surgical planning, diagnostics, and rehabilitation evaluations on an individual basis. Furthermore, we will also critically discuss these models w.r.t. the used geometry, boundary conditions, material properties, their verification, and reproducibility.

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Section: Model Verificationmentioning

confidence: 99%

Mathematical Models and Numerical Schemes for the Simulation of Human Phonation

Alipour¹,

Brücker²,

Cook³

et al. 2011

CBIO

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show abstract

“…In Section 2 the mathematical models are presented, describing the governing equations of fluid and solid mechanics, as well as the field interactions. For a detailed description of the methods and their implementation to solve the coupled problem by means of the finite element method, we refer to [16], which also covers validation with the experimental set up of [11]. Section 3 presents four different case studies and discusses these by comparing the volume flux through the glottis, as well as the vibration of the vocal folds.…”

Section: Introductionmentioning

confidence: 99%

Investigation of prescribed movement in fluid–structure interaction simulation for the human phonation process

Zörner

Döllinger

2013

Computers & Fluids

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In a partitioned approach for computational fluid–structure interaction (FSI) the coupling between fluid and structure causes substantial computational resources. Therefore, a convenient alternative is to reduce the problem to a pure flow simulation with preset movement and applying appropriate boundary conditions. This work investigates the impact of replacing the fully-coupled interface condition with a one-way coupling. To continue to capture structural movement and its effect onto the flow field, prescribed wall movements from separate simulations and/or measurements are used.As an appropriate test case, we apply the different coupling strategies to the human phonation process, which is a highly complex interaction of airflow through the larynx and structural vibration of the vocal folds (VF). We obtain vocal fold vibrations from a fully-coupled simulation and use them as input data for the simplified simulation, i.e. just solving the fluid flow. All computations are performed with our research code CFS++, which is based on the finite element (FE) method.The presented results show that a pure fluid simulation with prescribed structural movement can substitute the fully-coupled approach. However, caution must be used to ensure accurate boundary conditions on the interface, and we found that only a pressure driven flow correctly responds to the physical effects when using specified motion.

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“…Under certain conditions, the same technique for both disciplines can be used. The measurements performed by Gomes and Lienhart (2006 used the same camera system for the simultaneous acquisition of the velocity fields and the structural deflections. This procedure works well for FSI cases involving laminar flows and 2D structure deflections.…”

Section: Measuring Techniques For the Experimental Investigationsmentioning

confidence: 99%

“…This study also presents the first comparison between experimental data and predicted results achieved by the present code for a turbulent FSI problem. As another turbulent experimental benchmark, the investigations of Gomes andLienhart (2010, 2013) and Gomes (2011) have to be cited: the same geometry as in Gomes and Lienhart (2006) was used, but this time with water as the working fluid leading to much higher Reynolds numbers within the turbulent regime. The resulting FSI test case was found to be very challenging from the numerical point of view.…”

Section: Introductionmentioning

confidence: 99%

Flow past a cylinder with a flexible splitter plate: A complementary experimental–numerical investigation and a new FSI test case (FSI-PfS-1a)

et al. 2014

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The objective of the present paper is to provide a challenging and well-defined validation test case for fluid-structure interaction (FSI) in turbulent flow to close a gap in the literature. The following list of requirements are taken into account during the definition and setup phase. First, the test case should be geometrically simple which is realized by a classical cylinder flow configuration extended by a flexible structure attached to the backside of the cylinder. Second, clearly defined operating and boundary conditions are a must and put into practice by a constant inflow velocity and channel walls. The latter are also evaluated against a periodic setup relying on a subset of the computational domain. Third, the material model should be widely used. Although a rubber plate is chosen as the flexible structure, it is demonstrated by additional structural tests that a classical St. Venant-Kirchhoff material model is sufficient to describe the material behavior appropriately. Fourth, the flow should be in the turbulent regime. Choosing water as the working fluid and a medium-size water channel, the resulting Reynolds number of Re = 30, 470 guarantees a sub-critical cylinder flow with transition taking place in the separated shear layers. Fifth, the test case results should be underpinned by a detailed validation process. For this purpose complementary numerical and experimental investigations were carried out. Based on optical contactless measuring techniques (particle-image velocimetry and laser distance sensor) the phase-averaged flow field and the structural deformations were determined. These data were compared with corresponding numerical predictions relying on large-eddy simulations and a recently developed semi-implicit predictor-corrector FSI coupling scheme. Both results were found to be in close agreement showing a quasi-periodic oscillating flexible structure in the first swiveling FSI mode with a corresponding Strouhal number of about St FSI = 0.11.

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Experimental Study on a Fluid-Structure Interaction Reference Test Case

Cited by 18 publications

References 3 publications

Mathematical Models and Numerical Schemes for the Simulation of Human Phonation

Mathematical Models and Numerical Schemes for the Simulation of Human Phonation

Investigation of prescribed movement in fluid–structure interaction simulation for the human phonation process

Flow past a cylinder with a flexible splitter plate: A complementary experimental–numerical investigation and a new FSI test case (FSI-PfS-1a)

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