Qunyi Wang¹, Xiaoli Ma¹, Yongbin Bi¹, Haiyan He¹, Xiao Gu¹, Tongjing Liu^2,*, Lekun Zhao³

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.2, pp. 361-377, 2023, DOI:10.32604/fdmp.2022.020358 - 29 August 2022

Abstract Current methods for the analysis of channeling-path phenomena in reservoirs cannot account for the influence of time and space on the actual seepage behavior. In the present study, this problem is addressed considering actual production data and dynamic characteristic parameters quantitatively determined in the near wellbore area by fitting the water-cut curve of the well. Starting from the dynamic relationship between injection and production data, the average permeability is determined and used to obtain a real-time quantitative characterization of the seepage behavior of the channeling-path in the far wellbore area. For the considered case study More >

Zongfa Zhang¹, Minglu Zhang^1,*, Xinbiao Xiao²

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.2, pp. 345-359, 2023, DOI:10.32604/fdmp.2022.020233 - 29 August 2022

Abstract The tunnel-train-air interaction problem is investigated by using a numerical method able to provide relevant information about pressure fluctuations, aerodynamic drag characteristics and the “piston wind” effect. The method relies on a RNG k-ε two-equation turbulence model. It is shown that although reducing the oblique slope can alleviate the pressure gradient resulting from initial compression waves at the tunnel entrance, the pressure fluctuations in the tunnel are barely affected; however, a large reduction of micro-pressure wave amplitudes is found outside the tunnel. In comparison to the case where no tunnel hood is present, the amplitudes More > Graphic Abstract

Donglei Jiang¹, Heng Wang¹, Huan Diao¹, Tan Xiao¹, Yi Yu¹, Chunmin Zeng¹, Rui Zhang^2,*, Qi Huang², Mingbo Wang²

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.2, pp. 315-327, 2023, DOI:10.32604/fdmp.2022.020221 - 29 August 2022

Abstract L1 is one of the largest offshore gas fields currently under development. In order to optimize the related design, nodal analysis is applied (including proper consideration of the plant productivity, sensitivity to the tubing size, erosion effects, liquid carrying performance, and tubing string). As a result of such approach, it is shown that 13Cr material should be chosen as the appropriate tubing material. Moreover, 3-1/2 inches 9.3 lb/ft N80 tubing, 4-1/2 inches 12.75 lb/ft N80 tubing, 5-1/2 inches 17 lb/ft N80 tubing should be used for a gas production rate under 80 × 10⁴ m³/d, between 80 × 10⁴ m³/d and 120 × 10⁴ m³/d and above 120 × 10⁴ More >

Lingyun Zhao^1,2, Heng Yang^3,4,*, Yuanlong Wei^1,2,*, Yuhuan Bu^3,4, Shaorui Jing^3,4, Peiming Zhou^1,2

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.2, pp. 329-344, 2023, DOI:10.32604/fdmp.2022.020216 - 29 August 2022

Abstract Perforation and fracturing are typically associated with the development of coalbed methane wells. As the cement sheath is prone to failure during this process, in this work, the effects of the casing pressure, elastic modulus of the cement, elastic modulus of the formation, and casing eccentricity on the resulting stresses are analyzed in the frame of a finite element method. Subsequently, sensitivity response curves of the cement sheath stress are plotted by normalizing all factors. The results show that the maximum circumferential stress and Mises stress of the cement sheath increase with the casing internal More > Graphic Abstract

Aleksandr Lekomtsev^1,*, Vitaliy Bakaneev¹, Ivan Stepanenko¹, Petr Maximov¹, Yulia Rozhkova¹, Alexey Dengaev², Wanli Kang³

FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.2, pp. 285-301, 2023, DOI:10.32604/fdmp.2022.019809 - 29 August 2022

Abstract A new integrated oil production enhancement technology based on water-flooding energy recovery is proposed. After providing an extensive review of the existing scientific and technical literature on this subject, the proposed integrated technology is described together with the related process flow diagram, the criteria used to select a target facility for its implementation and the outcomes of the laboratory studies conducted to analyze emulsion formation and separation kinetics. Moreover, the outcomes of numerical simulations performed using Ansys CFX software are also presented. According to these results, using the proposed approach the incremental oil production may More >

Zhihong Tian¹, Yanhui Guo², Shen Su^1,*, Hui Lu¹

CMES-Computer Modeling in Engineering & Sciences, Vol.134, No.1, pp. 5-7, 2023, DOI:10.32604/cmes.2022.025097 - 24 August 2022

Abstract This article has no abstract. More >

Lisheng Liu^1,*, Xihua Chu², Xinhua Yang³, Jianzhong Chen¹, Qun Huang²

CMES-Computer Modeling in Engineering & Sciences, Vol.134, No.1, pp. 1-3, 2023, DOI:10.32604/cmes.2022.025081 - 24 August 2022

Abstract This article has no abstract. More >

Zhiqiang Xie^1,*, Haikun Teng¹, Anak Agung Ayu Putri Ardyanti¹, Xu Yu²

CMES-Computer Modeling in Engineering & Sciences, Vol.134, No.1, pp. 179-200, 2023, DOI:10.32604/cmes.2022.021550 - 24 August 2022

Abstract Given the existing integrated scheduling algorithms, all processes are ordered and scheduled overall, and these algorithms ignore the influence of the vertical and horizontal characteristics of the product process tree on the product scheduling effect. This paper presents an integrated scheduling algorithm for the same equipment process sequencing based on the Root-Subtree horizontal and vertical pre-scheduling to solve the above problem. Firstly, the tree decomposition method is used to extract the root node to split the process tree into several Root-Subtrees, and the Root-Subtree priority is set from large to small through the optimal completion… More >

Yingpeng Dai¹, Junzheng Wang¹, Jing Li^1,*, Lingfeng Meng², Songfeng Wang^2,*

CMES-Computer Modeling in Engineering & Sciences, Vol.134, No.1, pp. 135-156, 2023, DOI:10.32604/cmes.2022.021525 - 24 August 2022

Abstract It is important for the autonomous system to understand environmental information. For the autonomous system, it is desirable to have a strong generalization ability to deal with different complex environmental information, as well as have high accuracy and quick inference speed. Network ensemble architecture is a good choice to improve network performance. However, it is unsuitable for real-time applications on the autonomous system. To tackle this problem, a new neural network ensemble named partial-shared ensemble network (PSENet) is presented. PSENet changes network ensemble architecture from parallel architecture to scatter architecture and merges multiple component networks More >

Meng Zhang¹, Zhichao Zhou¹, Guifeng Zhao^1,*, Fangfang Wang^2,*

CMES-Computer Modeling in Engineering & Sciences, Vol.134, No.1, pp. 673-698, 2023, DOI:10.32604/cmes.2022.021463 - 24 August 2022

Abstract Computational fluid dynamics (CFD) and the finite element method (FEM) are used to investigate the wind-driven dynamic response of cantilever traffic signal support structures as a whole. By building a finite element model with the same scale as the actual structure and performing modal analysis, a preliminary understanding of the dynamic properties of the structure is obtained. Based on the two-way fluid-structure coupling calculation method, the wind vibration response of the structure under different incoming flow conditions is calculated, and the vibration characteristics of the structure are analyzed through the displacement time course data of… More >