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Using vorticity as an indicator for the generation of optimal coarse grid distribution

Ashjari, M. A ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1007/s11242-008-9217-9
  3. Publisher: 2008
  4. Abstract:
  5. An improved vorticity-based gridding technique is presented and applied to create optimal non-uniform Cartesian coarse grid for numerical simulation of two-phase flow. The optimal coarse grid distribution (OCGD) is obtained in a manner to capture variations in both permeability and fluid velocity of the fine grid using a single physical quantity called "vorticity". Only single-phase flow simulation on the fine grid is required to extract the vorticity. Based on the fine-scale vorticity information, several coarse grid models are generated for a given fine grid model. Then the vorticity map preservation error is used to predict how well each coarse grid model reproduces the fine-scale simulation results. The coarse grid model which best preserves the fine-scale vorticity, i.e. has the minimum vorticity map preservation error is recognized as an OCGD. The performance of vorticity-based optimal coarse grid is evaluated for two highly heterogeneous 2D formations. It is also shown that two-phase flow parameters such as mobility ratio have only minor impact on the performance of the predicted OCGD. © Springer Science+Business Media B.V. 2008
  6. Keywords:
  7. Computer simulation ; Flow simulation ; Fluid dynamics ; Fluid mechanics ; Law enforcement ; Multiphase flow ; Parameter estimation ; Two phase flow ; Non-uniform grid ; Optimal coarse grid generation ; Porous media ; Upscaling ; Vorticity ; Flow modeling ; Flow velocity ; Parameterization ; Permeability
  8. Source: Transport in Porous Media ; Volume 75, Issue 2 , 2008 , Pages 167-201 ; 01693913 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11242-008-9217-9