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Comparison and Improving of Free Surface Modeling Methods In Moving Grids

Jeddi, Reza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41854 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed; Nouri Borujerdi, Ali
  7. Abstract:
  8. In the present study a through comparison has been made between different free surface modeling methods. Methods for improving the current schemes are analyzed and studied. Among different proposed methods and based on the current in-house CFD solver’s limitations and capabilities, the Flux-Blending Strategy has been used for interface capturing in the framework of the Finite Volume Method (FVM). The proposed scheme has been coupled with other algorithms for improving the capabilities and functionality of the general computational fluid dynamic software, NUMELS, in order to simulate fluid flows with sharp interface.
    The improved interface capturing scheme uses the continuous switching strategy between up-wind (High Resolution) differencing and down-wind (Compressive and Bounded) differencing. The switching strategy uses a blending function based on the angle between free-surface and the present cell face. The volume fraction on the face of the control volume will then be approximated in an accurate manner. Numerical methods are used to couple governing equations, i.e. Navier-Stokes and Rigid Body Motion (RBM) equations with the volume fraction scalar transport equation. Governing equations of the fluid flow are discretized based on collocated strategy in both structured and unstructured/non-orthogonal grids and fractional step method is used for solving the navier-stokes equations. Using the moving grid approach, the computational domain will move based on the rigid body motion in each time step and governing equations will be solved in the next time step.
    First, using classical tests, the accuracy of the numerical solution of the volume fraction scalar transport equations is verified and then more intricate and complex tests are carried out for non-linear hydrodynamic problems
  9. Keywords:
  10. Computational Fluid Dynamics (CFD) ; Free Surface Modeling ; Volume of Fluid ; Moving Mesh ; Flux Blending Technique

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