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Fsi nose
Fsi nose
Fsi nose
Fsi nose
Fsi nose
Fsi nose
Fsi nose
Fsi nose
Fsi nose
Fsi nose
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Fsi nose

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

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