涡轮机械长期尺度解析模拟中协同处理过程周期收敛分析的数学公式

IF 0.6 4区 工程技术 Q4 MECHANICS Progress in Computational Fluid Dynamics Pub Date : 2021-01-01 DOI:10.1504/PCFD.2021.10036934
J. M. F. Oro
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引用次数: 0

摘要

尺度解析模拟,如LES模型,是最新的CFD技术,用于分析涡轮机械中的非定常流动和湍流。尽管它们的计算成本很高,但它们提供了嵌入湍流尺度的非定常、时间分辨的流动解决方案,这需要额外的统计描述。本文给出了计算和保证其周期性收敛、更新运行中的相位平均值和残差所需的数学公式,从而大大减少了存储的数据量。利用三维线性叶栅模型,将该公式应用于低速轴流风机中动静相互作用的壁面模拟LES数值数据库,结果表明,由于相干流涡的固有不稳定性,初级流变量比湍流结构收敛得更快。这项工作构成了协同处理概念的一部分,其中一些后处理例程在CFD模拟的迭代过程中解决,以节省计算成本。奥维耶多大学的论文题目为“低速轴流风机的非定常动静相互作用”(2005)。他目前的研究工作主要集中在:1)涡轮机械湍流和非定常流动的分析与描述;2)实验流体力学测量与可视化技术的发展与应用;流体机械CFD建模与数值模拟。
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Mathematical formulation for the analysis of the periodic convergence during co-processing routines in long-run, scale-resolving simulations of turbomachinery
: Scale-resolving simulations, like LES modelling, are recent CFD techniques to analyse numerically unsteady flows and turbulence in turbomachinery. Despite their high computational costs, they provide an unsteady, time-resolved solution of the flow with embedded turbulent scales that requires an additional statistical description. This paper provides the mathematical formulation required to compute and assure its periodic convergence, updating the phase-averaged values and the residual on the run, so the amount of data to be stored is extremely reduced. The formulation, applied over a numerical database of a wall-modelled LES simulation of the rotor-stator interaction in a low-speed axial fan using a 3D linear cascade model, reveals that primary flow variables converge faster than turbulent structures due to inherent instabilities of the coherent flow vortices. This work forms part of the concept of co-processing, where some post-processing routines are resolved during the iterative process of CFD simulations to save computational costs. University of Oviedo with the thesis dissertation entitled ‘Unsteady rotor-stator interaction in a low-speed axial flow fan’ (2005). His current research activities are mainly focused on: 1) the analysis and description of turbulence and unsteady flows in turbomachinery; 2) the development and application of measurement and visualisation techniques in experimental fluid mechanics; 3) CFD modelling and numerical simulation of fluid machinery.
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来源期刊
CiteScore
1.50
自引率
14.30%
发文量
33
审稿时长
7.5 months
期刊介绍: CFD is now considered an indispensable analysis/design tool in an ever-increasing range of industrial applications. Practical flow problems are often so complex that a high level of ingenuity is required. Thus, besides the development work in CFD, innovative CFD applications are also encouraged. PCFD''s ultimate goal is to provide a common platform for model/software developers and users by balanced international/interdisciplinary contributions, disseminating information relating to development/refinement of mathematical and numerical models, software tools and their innovative applications in CFD. Topics covered include: -Turbulence- Two-phase flows- Heat transfer- Chemical reactions and combustion- Acoustics- Unsteady flows- Free-surfaces- Fluid-solid interaction- Navier-Stokes solution techniques for incompressible and compressible flows- Discretisation methods and schemes- Convergence acceleration procedures- Grid generation and adaptation techniques- Mesh-free methods- Distributed computing- Other relevant topics
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