Accelerating the Convergence of Multiphase Flow Simulations when Employing Non-Uniform Structured Grids

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Krishnamoorthy Gautham; Clarke Lauren Elizabeth; Thornock Jeremy Nicholas

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Journal Paper

Paper Information

Journal: JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS Year:2021 | Volume:7 | Issue:1 Page(s): 235-253

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Information Journal Paper

Title

Accelerating the Convergence of Multiphase Flow Simulations when Employing Non-Uniform Structured Grids

Author(s)

Krishnamoorthy Gautham | Clarke Lauren Elizabeth | Thornock Jeremy Nicholas | Issue Writer Certificate

Keywords

PETSc

MFiX

BiCGSTAB

Preconditioner

Multiphase flow

Abstract

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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APA: Copy

Krishnamoorthy, Gautham, & Thornock, Jeremy Nicholas. (2021). Accelerating the Convergence of Multiphase Flow Simulations when Employing Non-Uniform Structured Grids. JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS, 7(1), 235-253. SID. https://sid.ir/paper/975835/en

Vancouver: Copy

Krishnamoorthy Gautham, Thornock Jeremy Nicholas. Accelerating the Convergence of Multiphase Flow Simulations when Employing Non-Uniform Structured Grids. JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS[Internet]. 2021;7(1):235-253. Available from: https://sid.ir/paper/975835/en

IEEE: Copy

Gautham Krishnamoorthy, and Jeremy Nicholas Thornock, “Accelerating the Convergence of Multiphase Flow Simulations when Employing Non-Uniform Structured Grids,” JOURNAL OF APPLIED AND COMPUTATIONAL MECHANICS, vol. 7, no. 1, pp. 235–253, 2021, [Online]. Available: https://sid.ir/paper/975835/en

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