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The Study of Flow in Respiratory System with Fluid Structure Interaction Approach

Zendehbad, Mohsen | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41813 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeeidi, Mohammad Saeeid
  7. Abstract:
  8. In respiratory system of live bodies, different mechanical phenomena such as air suction, diffusion and deposition of particles and transport of species between air and blood take place. Furthermore, the geometry of lung is a complex and multi scale geometry. In order to reduce these complexities, the acinus behavior is transformed to numerical functions which can be used as boundary conditions for simulating upper generations of the lung. Hence, in current study, the air flow suction of the lung is described as a function of the mechanical properties of the lung tissue. This task is fulfilled by modeling the flow for different Elastic moduli and taking fluid structure interaction into consideration. Moreover, the transport and deposition of fine particles in acinus will be transformed to functions. This task is also fulfilled through two stages of full scale and fine scale modeling and simultaneous usage of the two series of results. Using these functions as boundary conditions for first generations of lung will finally result in reaching a digital lung concept.
    In the last section, regarding the importance of tracking particles with CFD, the two salient approaches of particle diffusion modeling, Lagrangian and Eulerian, will be compared with each other. To do this, the results of simulating the same problems with both approaches will be compared. Results confirm that in low concentrations, Eulerian results deviate considerably from Lagrangian results
  9. Keywords:
  10. Lung ; Particles Tracking ; Fluid-Solid Interaction ; Eulerian-Lagrangian Approach ; Biofluid

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