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首页> 外文期刊>Journal of Mechanical Science and Technology >False diffusion in numerical simulation of combustion processes in tangential-fired furnace
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False diffusion in numerical simulation of combustion processes in tangential-fired furnace

机译：切向燃烧炉燃烧过程数值模拟中的虚假扩散

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摘要

Numerical simulation serves as one of the most important tools for analyzing coal combustion in Tangentially Fired Furnaces (TFF) with NUMERICAL FALSE DIFFUSION as one key problem that degrades the simulation accuracy, especially for complex flow patterns. False diffusion often completely compromises the accuracy, leading to erroneous predictions. This paper reviews various methods to reduce the numerical diffusion. In computational fluid dynamics (CFD), false diffusion originates from a truncation error of the Taylor series approximation of the derivative and multidimensional discretization effects. Higher-order upwind convective schemes were designed to reduce truncation errors, while grid line adjusting methods were developed to reduce crossflow diffusion. This paper compares numerical and experimental results for isothermal flows to evaluate these methods. Results with the standard upwind scheme in a rectangular Cartesian mesh are compared with results in body-fitted meshes for comprehensive combustion processes in a TFF. Analysis of the false diffusion effect in the x, y, z directions and the artificial viscosity distribution in a rectangular mesh shows where the false diffusion overtakes the real physical diffusion and where the mesh must be refined or grid line must be adjusted to improve TFF combustion simulations.
机译：数值模拟是利用数值伪扩散分析切向燃烧炉（TFF）中煤燃烧的最重要工具之一，这是降低模拟精度（尤其是复杂流型）的一个关键问题。错误扩散通常会完全破坏准确性，从而导致错误的预测。本文回顾了减少数值扩散的各种方法。在计算流体动力学（CFD）中，错误扩散源自导数和多维离散化效果的泰勒级数逼近的截断误差。设计了高阶迎风对流方案以减少截断误差，同时开发了网格线调整方法以减少横流扩散。本文比较了等温流动的数值和实验结果，以评估这些方法。将矩形笛卡尔网格中标准迎风方案的结果与人体拟合网格中的结果进行比较，以进行TFF中的全面燃烧过程。对矩形网格中x，y，z方向上的虚假扩散效果和人工粘度分布的分析表明，虚假扩散超过了实际物理扩散，必须对网格进行细化或调整网格线以改善TFF燃烧模拟。

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