Med Biol Eng Comput - Experimental validation of quasi-one-dimensional and two-dimensional steady glottal flow models.

Tópicos

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Resumo

Physical modelling of phonation requires a mechanical description of the vocal fold coupled to a description of the flow within the glottis. In this study, an in-vitro set-up, allowing to reproduce flow conditions comparable to those of human glottal flow is used to systematically verify and discuss the relevance of the pressure and flow-rate predictions of several laminar flow models. The obtained results show that all the considered flow models underestimate the measured flow-rates and that flow-rates predicted with the one-dimensional model are most accurate. On the contrary, flow models based on boundary-layer theory and on the two-dimensional numerical resolution of Navier-Stokes equations yield most accurate pressure predictions. The influence of flow separation on the predictions is discussed since these two models can estimate relevant flow separation positions whereas this phenomenon is treated in a simplified ad-hoc way in the one-dimensional flow modelling. Laminar flow models appear to be unsuitable to describe the flow downstream of the glottal constriction. Therefore, the use of flow models taking into account three-dimensional effects as well as turbulence is motivated.

Resumo Limpo

physic model phonat requir mechan descript vocal fold coupl descript flow within glotti studi invitro setup allow reproduc flow condit compar human glottal flow use systemat verifi discuss relev pressur flowrat predict sever laminar flow model obtain result show consid flow model underestim measur flowrat flowrat predict onedimension model accur contrari flow model base boundarylay theori twodimension numer resolut navierstok equat yield accur pressur predict influenc flow separ predict discuss sinc two model can estim relev flow separ posit wherea phenomenon treat simplifi adhoc way onedimension flow model laminar flow model appear unsuit describ flow downstream glottal constrict therefor use flow model take account threedimension effect well turbul motiv

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