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An N-parallel FENE-P constitutive model and its application in large-eddy simulation of viscoelastic turbulent drag-reducing flow

机译:N并行FENE-P本构模型及其在粘弹性湍流减阻流大涡模拟中的应用

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In this paper, an N-parallel FENE-P constitutive model based on multiple relaxation times is proposed, it can be viewed as a simplified version of the multi-mode FENE-P model under the assumption of identical deformation rate. The proposed model holds the merit of multiple relaxation times to preserve good computational accuracy but could reduce the computational cost, especially in the application of high-fidelity numerical simulation of viscoelastic turbulent drag-reducing flow. Firstly the establishment of N-parallel FENE-P model and the numerical approach to calculate the apparent viscosity are introduced. Then the proposed model is compared with the experimental data and the conventional FENE-P model in estimating rheological properties of two common-used viscoelastic fluids to validate its performance. This work is an extended version of our ICCS conference paper [1]. To further judge the performance of the proposed FENE-P model in complex turbulent flows, the extended application of the proposed model in large-eddy simulation of viscoelastic turbulent drag-reducing channel flow is carried out. (C) 2018 Elsevier B.V. All rights reserved.
机译:本文提出了一种基于多重弛豫时间的N平行FENE-P本构模型,在变形率相同的情况下,可以看作是多模FENE-P模型的简化版本。提出的模型具有多次松弛时间的优点,可以保持较好的计算精度,但可以降低计算成本,特别是在粘弹性湍流减阻流的高保真数值模拟中。首先介绍了N-平行FENE-P模型的建立和计算表观粘度的数值方法。然后,将所提出的模型与实验数据和常规的FENE-P模型进行比较,以估计两种常用的粘弹性流体的流变性,以验证其性能。这项工作是我们ICCS会议论文[1]的扩展版本。为了进一步判断所提出的FENE-P模型在复杂湍流中的性能,该模型在粘弹性湍流减阻通道流大涡模拟中的扩展应用。 (C)2018 Elsevier B.V.保留所有权利。

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