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متن کامل


اطلاعات دوره: 
  • سال: 

    2021
  • دوره: 

    7
  • شماره: 

    1
  • صفحات: 

    235-253
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    90
  • دانلود: 

    0
چکیده: 

Non-uniform grids inevitably arise in multiphase flow simulation scenarios due to the need to resolve near-wall phenomena and/or large L/D ratios associated with the reactor configuration. This in conjunction with large density ratios of the constituent phases can retard the convergence of the pressure-correction equation that results from applying operator-splitting methods to the incompressible Navier-Stokes equations. Various pre-conditioning strategies to this ill-conditioned pressurecorrection matrix are explored in this study for a class of bubbling bed simulations encompassing: different particle densities, bedheights and dimensions (2D/3D). The right-side Block Jacobi preconditioning option resulted in a 20-35% decrease in CPU time that correlated well with a decrease in the number of iterations to reach a specified tolerance.

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بازدید 90

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نویسنده: 

RAFIEI AMIN | AZADI MARZIEH

اطلاعات دوره: 
  • سال: 

    2013
  • دوره: 

    44
تعامل: 
  • بازدید: 

    145
  • دانلود: 

    0
چکیده: 

IN THIS PAPER, THE GLOBAL TRANSPOSE-FREE QUASI-MINIMAL RESIDUAL METHOD IS PRESENTED TO SOLVE THE SYLVESTER MATRIX EQUATION. WE HAVE ALSO COMPARED THIS NEW METHOD WITH THE WELL-KNOWN GLOBAL BiCGSTAB AND THE GLOBAL GMRES METHODS.

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بازدید 145

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اطلاعات دوره: 
  • سال: 

    1393
  • دوره: 

    33
  • شماره: 

    1
  • صفحات: 

    101-111
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    746
  • دانلود: 

    265
چکیده: 

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عنوان: 
نویسندگان: 

اطلاعات دوره: 
  • سال: 

    1401
  • دوره: 

  • شماره: 

  • صفحات: 

    -
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    31
  • دانلود: 

    0
کلیدواژه: 
چکیده: 

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بازدید 31

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اطلاعات دوره: 
  • سال: 

    2022
  • دوره: 

    10
  • شماره: 

    3
  • صفحات: 

    716-725
تعامل: 
  • استنادات: 

    0
  • بازدید: 

    44
  • دانلود: 

    0
چکیده: 

A novel local meshless scheme based on the radial basis function (RBF) is introduced in this article for price multi-asset options of even European and American types based on the Black-Scholes model. The proposed approach is obtained by using operator splitting and repeating the schemes of Richardson extrapolation in the time direction and coupling the RBF technology with a finite-difference (FD) method that leads to extremely sparse matrices in the spatial direction. Therefore, it is free of the ill-conditioned difficulties that are typical of the standard RBF approximation. We have used a strong iterative idea named the stabilized Bi-conjugate gradient process (BiCGSTAB) to solve highly sparse systems raised by the new approach. Moreover, based on a review performed in the current study, the presented scheme is unconditionally stable in the case of independent assets when spatial discretization nodes are equispaced. As seen in numerical experiments, it has a low computational cost and generates higher accuracy. Finally, the proposed local RBF scheme is very versatile so that it can be used easily for solving numerous models and obstacles not just in the finance sector, as well as in other fields of engineering and science.

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بازدید 44

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