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Hybrid RANS/LES of a supersonic combustor

机译:超音速燃烧器的混合RANS / LES

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摘要

A novel method for the hybridization of RANS and LES is presented tailored for the utilization in supersonic combustor ducts. The intention is to treat the largest portion of the boundary layers with RANS in order to reduce the computational requirements of LES in near-wall regions. The method is comprised of two components: Component A accounts for boundary layer growth in supersonic flow regions with thin boundary layers. Component B is designed to identify shock/boundary layer interaction regions and places the RANS/LES interface such that these interaction regions are treated with RANS. The method is not tied to specific models for RANS or LES, instead it represents a procedure to couple an eddy viscosity type RANS turbulence model with an arbitrary LES model. The hybrid RANS/LES approach is applied to the simulation of a two-staged injection supersonic combustor and the findings are compared to URANS simulations conducted for the same flow conditions. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译:提出了一种新的RANS和LES杂交方法,专为在超音速燃烧器管道中使用而设计。目的是用RANS处理边界层的最大部分,以减少近壁区域中LES的计算要求。该方法由两个部分组成:组分A解释了边界层薄的超音速流动区域中边界层的生长。组件B设计为识别冲击/边界层相互作用区域,并放置RANS / LES界面,以便使用RANS处理这些相互作用区域。该方法不依赖于RANS或LES的特定模型,而是代表一种将涡流粘度类型的RANS湍流模型与任意LES模型耦合的过程。将RANS / LES混合方法应用于两级喷射式超音速燃烧器的仿真,并将结果与​​在相同流动条件下进行的URANS仿真进行比较。 (C)2017 Elsevier Masson SAS。版权所有。

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