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Numerical Study of Expiratory Flow in the case of mjaor upper airway obstruction with fluid-structure interaction,[object Object],Dr. Zishun LIU and George XU,[object Object]
Objective,[object Object],To explore the fluid-structure interaction methodology (available in ADINA) to gain insight into the obstructive sleep apnea syndrome (OSAS),[object Object],Coupling the structure module (ADINA-A) with the fluid dynamics module (ADINA-F),[object Object]
Numerical procedure ,[object Object],NASTRAN,[object Object],Structure model (geom+mesh),[object Object],Fluid model,[object Object],(geom+mesh),[object Object],ADINA,[object Object],ADINA-A,[object Object],(setup),[object Object],ADINA-F,[object Object],(setup),[object Object],(Iterative),[object Object],ADINA,[object Object],ADINA,[object Object],(post-processing),[object Object],** Direct coupling approaching will be explored comparatively in future),[object Object]
Testing Case,[object Object],Geometrial configuration,[object Object],D=49mm, d=25mm,[object Object],hc = 1.84mm,[object Object],Running condition:,[object Object],Pext = 200Pa, Pout = 0 Pa,[object Object],Pin = 0 - 200 Pa,[object Object],hc,[object Object],Pext,[object Object],Pout,[object Object],Pin,[object Object]
Model Settings,[object Object],Mesh for structure model,[object Object],Boundary conditions in structure model,[object Object],FSI interface,[object Object],Mesh for CFD model,[object Object],(partial view),[object Object],Boundary conditions in CFD model,[object Object]
Preliminary Results,[object Object],Evolution of maximum vertical displacement (downwards),[object Object],Y-displacement (downwards),[object Object],Time steps,[object Object]
Preliminary Results,[object Object],Evolution of displacement on the longitudinal vertical cutting plane through shell centre (magnified view),[object Object],t = 0,[object Object],t = 1,[object Object],t = 10,[object Object],t = 20,[object Object],t = 30,[object Object],t = 50,[object Object]
Preliminary Results,[object Object],Evolution of velocity field,[object Object],t =0,[object Object],t = 1,[object Object],t = 10,[object Object],t = 20,[object Object],t = 30,[object Object],t = 50,[object Object]
Conclusion,[object Object],The main objective here is to test the feasibility in using ADINA to deal with the FSI problem of concern.,[object Object],The preliminary effort implies that ADINA can be successfully adopted in the FSI study. ,[object Object],Uncertainties in the preliminary model lie in:,[object Object],Relatively coarse CFD grid;,[object Object],Insufficient infos about the running conditions;,[object Object]
Animation of deformation,[object Object]

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