scholarly journals NUMERICAL STUDY ON CONSTITUTIVE RELATION OF DEBRIS FLOW BY USING A DEM-FLOW COUPLING MODEL

2004 ◽  
Vol 48 ◽  
pp. 901-906
Author(s):  
Yoshihiko SHIMIZU ◽  
Kengo OSADA
Keyword(s):  
Debris Flow ◽  
Constitutive Relation ◽  
Numerical Study ◽  
Coupling Model ◽  
Flow Coupling

Reservoir and Wellbore Flow Coupling Model for Fishbone Multilateral Wells in Bottom Water Drive Reservoirs

2021 ◽  
pp. 1-27
Author(s):  
ping Yue ◽  
Jiantang Zhou ◽  
Li Xia Kang ◽  
Ping Liu ◽  
Jia Chunsheng ◽  
...  
Keyword(s):  
Oil Recovery ◽  
Bottom Water ◽  
Water Reservoir ◽  
Pressure Profile ◽  
Coupling Model ◽  
New Model ◽  
Flow Coupling ◽  
Field Situation ◽  
Production Wells ◽  
Actual Field

Abstract Nowadays, different types of complex production wells are applied in challenging reservoirs in order to maximize oil recovery. A representative application is the fishbone multilateral horizontal wells, which have advantages of expanding the drainage area information and reducing the pressure loss in the long single lateral wellbore. This paper investigated the performance of fishbone wells and derived a wellbore and reservoir flow coupling model for fishbone multilateral wells in the bottom water reservoirs. The new model considered plenty of parameters that may have significant impacts on productivity and pressure drop in the well, including the fishbone structure, the main and branch wellbores' length, the spacing distance of the branch wellbores, wellbore radius, and preformation parameters. Furthermore, a sensitivity analysis example by the numerical method presented in this paper. Compared with other models, our coupling model, when it is degraded to horizontal well, is more consistent with the results of actual field situation. In another comparative analysis, the results of the new model with branches show a good match with the numerical simulation results by software. The proposed method in this paper can be used as a valuable tool to analyze the productivity, wellbore inflow profile, and pressure profile of the fishbone multilateral wells in the bottom water reservoir.

scholarly journals Establishment and application of heat flow coupling model

2019 ◽  
Vol 23 (1) ◽  
pp. 207-218
Author(s):  
Jun He ◽  
Gao-Liang Peng ◽  
Ling-Tao Yu ◽  
Chen-Zheng Li ◽  
Chuan-Hao Li ◽  
...  
Keyword(s):  
Heat Flow ◽  
Real Time ◽  
Initial Conditions ◽  
Coupling Model ◽  
Productive Efficiency ◽  
Maximum Deviation ◽  
Inspection Method ◽  
The Real ◽  
Flow Coupling ◽  
Washing Process

Wax deposition on walls of oil pipes is a common occurrence in crude oil extraction and is one of the major impediments to oilfield production. The most common method of paraffin removal is superconducting car thermal washing. This study proposes a heat flow coupling model that can analyze the temperature of the tubing-casing annular space to solve the low efficiency problem caused by adjusting initial parameters empirically. Using the superconducting car thermal washing process at the test oil well in city of Daqing, Chine as research object, the real-time temperature of annulus under various initial conditions is acquired by the fully-distributed Raman optical fiber temperature monitoring system. Compared with the real time data, theoretical data has a maximum deviation of 5?C, this result verifies the accuracy of the model. Based on the model, the study investigates the optimal initial parameters of superconducting car thermal washing by taking effective depth as an optimization goal. The optimal parameters for oil wells with different working conditions are obtained to improve the effectiveness of paraffin removal and increase thermal efficiency. This study provides theoretical support and an inspection method to promote superconducting car thermal washing and paraffin removal as well as to improve productive efficiency.

NUMERICAL STUDY OF IMPACT FORCE CHARACTERISTICS OF DEBRIS FLOW

2020 ◽  
Vol 25 (4) ◽  
pp. 34-42
Author(s):  
S.G. Lee ◽  
S. Lee ◽  
J.Y. Lee ◽  
J.A. Um ◽  
W.H. Yi
Keyword(s):  
Debris Flow ◽  
Impact Force ◽  
Numerical Study ◽  
Force Characteristics

Coating Composition Evolution during the Deposition of Al and N from Plasma on a Cylindrical Substrate

2016 ◽  
Vol 685 ◽  
pp. 690-694 ◽  
Author(s):  
Sergey A. Shanin ◽  
Anna G. Knyazeva ◽  
Olga Kryukova
Keyword(s):  
Chemical Reactions ◽  
Effective Properties ◽  
Cylindrical Specimen ◽  
Numerical Study ◽  
Coupling Model ◽  
Transfer Processes ◽  
Coating Composition ◽  
Transient Zone ◽  
Transfer Mechanisms

This paper presents the results of the numerical study of the coating composition evolution deposited on a cylindrical specimen from plasma containing aluminum and nitrogen. Calculations were based on a coupling model, which accounted for various transfer mechanisms and staged chemical reactions in the coating and in the transient zone. The evolution of the coating composition is connected with transfer processes, chemical reactions, and with the change of effective properties.

Numerical Study on Bending Behavior of Copper Alloy Thin Plate by Single Pulse Laser

2014 ◽  
Vol 1003 ◽  
pp. 113-116
Author(s):  
Su Qin Jiang ◽  
Ai Hui Liu ◽  
Xue Ting Wang ◽  
Jian Hua Wu ◽  
Bo Kui Li
Keyword(s):  
Thin Plate ◽  
Pulse Laser ◽  
Copper Alloy ◽  
Numerical Study ◽  
Dynamic Change ◽  
Single Pulse ◽  
Coupling Model ◽  
Laser Forming ◽  
Bottom Surface ◽  
Mechanical Coupling

To study the bending characteristics of copper alloy thin plate by single pulse laser, the thermal mechanical coupling model of pulsed laser forming (PLF) was established; the dynamic change and steady distribution for the fields of temperature, stress& strain and displacement were analyzed. The results show n that during the pulse laser heating stage, the temperature gradient along the thickness direction is far less than that of the heat affected zone; due to the constraints of materials around the heating field, the compressive stress and negative strain are appeared, the cantilever end of sample produces warping deformations; in the cooling stage, the temperature of top and bottom surface material drops rapidly, the sample is with a negative bending and reduced deformation. This is related to the transferring of the stress change and the recovery of part of the elastic deformation in heating area.

scholarly journals Effect of Rotation Friction Ratio on the Power Extraction Performance of a Passive Rotation VAWT

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Jianyang Zhu ◽  
Changbin Tian
Keyword(s):  
Numerical Study ◽  
Large Angle ◽  
Rotation Velocity ◽  
Vertical Axis ◽  
Coupling Model ◽  
Working Environment ◽  
Vertical Axis Wind Turbine ◽  
Power Extraction ◽  
Passive Rotation ◽  
Extraction Performance

This paper performs a systematic numerical study to investigate the effect of rotation friction ratio on the power extraction performance of a passive rotation H-type vertical axis wind turbine (H-VAWT). In contrast to the previous literature, the present work does not impose rotation velocity on the turbine, and the rotation friction ratio which reflects the effect of external load characteristics on the turbine is introduced to the governing equation of the turbine. During each iteration, the rotation velocity of the turbine is computed after having determined the aerodynamic torque exerted on the blade of the turbine. This is more consistent with the actual working environment of the H-VAWT. A novel numerical coupling model was developed to simulate the interaction between the fluid and the passive rotation of the H-VAWT; then, the power extraction performance of the turbine with different rotation friction ratio was systematically analyzed. The results demonstrate that the power extraction performance of H-VAWT will be enhanced when the H-VAWT has appropriate rotation friction ratio. It is also found that the flow separation induced by large angle of attack is alleviated essentially if the H-VAWT has appropriate rotation friction ratio, which makes the H-VAWT have better energy extraction performance.

Quasi-statically growing crack tip fields in plastically compressible hardening-softening-hardening solid

2018 ◽  
Vol 9 (4) ◽  
pp. 532-547 ◽  
Author(s):  
Sushant Singh ◽  
Debashis Khan
Keyword(s):  
Constitutive Relation ◽  
Numerical Study ◽  
Crack Tip ◽  
Small Scale ◽  
Isotropic Hardening ◽  
Flow Rule ◽  
Hardening Material ◽  
Static Mode ◽  
Content Type ◽  
Crack Tip Fields

Purpose As the normality concept for frictional dilatant material has a serious drawback, the key feature in this numerical study is that the material here is characterized by elastic-viscoplastic constitutive relation with plastic non-normality effect for two different hardness functions. The paper aims to discuss this issue. Design/methodology/approach Quasi-static, mode I plane strain crack tip fields have been investigated for a plastically compressible isotropic hardening–softening–hardening material under small-scale yielding conditions. Finite deformation, finite element calculations are carried out in front of the crack with a blunt notch. For comparison purpose a few results of a hardening material are also provided. Findings The present numerical calculations show that crack tip deformation and the field quantities near the tip significantly depend on the combination of plastic compressibility and slope of the hardness function. Furthermore, the consideration of plastic non-normality flow rule makes the crack tip deformation as well as the field quantities significantly different as compared to those results when the constitutive equation exhibits plastic normality. Originality/value To the best of the authors’ knowledge, analyses, related to the constitutive relation exhibiting plastic non-normality in the context of plastic compressibility and softening (or softening hardening) on the near tip fields, are not explored in the literature.

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