Application Of Numerical Simulation Technology Research Articles

Application of Numerical Simulation Technology in New Intelligent Reinforcing Method of Shield Tunnel End in Seaside Environment

The instability of the soil at the shield end is an important safety hazard in shield tunnel construction. In loose and weak strata, the risk of instability and damage is higher, and the loss is greater. In this paper, the instability and failure of the end soil in loose and weak strata are studied. To ensure the smooth start and arrival of the shield and avoid engineering accidents such as end soil instability, surface subsidence, landslides, etc., during the construction process, this paper summarizes the commonly used reinforcement technology and characteristics of the shield in and out of the tunnel. Through numerical simulation, the influence of the thickness of the added solid on the formation and diaphragm wall is analyzed. It is found that the reinforcement effect increases with the increase in thickness of the added solid, but the change rate becomes smaller and smaller. The indoor triaxial test is used to find out the physical and mechanical properties of loose sand and soft clay. The biaxial compression numerical model is built with PFC2D (Particle Flow Code 2D PFC 6.0), and the wall constraint type is improved. With the help of the PFC biaxial test, the influence of model parameters on the macroscopic properties of the simulated material was analyzed. The research has certain reference values for the actual construction of the project.

Application of numerical simulation technology in remaining oil analysis

Taking the application of numerical simulation technology in remaining oil analysis as the research object, this paper briefly introduces the situation of the remaining oil reservoir and analyzes some problems facing the reservoir at present. Then, in order to promote the solution of the problem, the construction process of the three-dimensional geological model was discussed around the actual geological situation, and finally the application process of the numerical simulation technology in the remaining oil was analyzed, and the follow-up comprehensive treatment plan was proposed. I hope that relevant research can provide Certain reference.

Analysis of the Groundwater Resource Pollution of Coal-Fired Power Plants and Its Impact on Geotechnical Engineering Properties by Numerical Simulation Technology

Objective: The objective is to investigate the impact of groundwater resource pollution of coal-fired power plants and its impact on the properties of geotechnical engineering based on numerical simulation technology, thereby proving the effectiveness and superiority of numerical simulation technology in preventing groundwater resource pollution and forecasting the related information, which would provide direction and guidance for the treatment and management of groundwater resource pollution. Method: First, the regions to be investigated are divided and generalized. Then, relevant experiments are carried out for the calculations of hydrogeological parameters to establish the hydrogeological conceptual model. Next, the real-time water level data recorded by the observations are used to identify and verify the model effectively. Afterward, the numerical simulation of groundwater solute transportation is carried out again. During the process, the establishment of the groundwater quality model is the focus, followed by the application of numerical simulation technology to forecast the environmental impacts of groundwater pollution, including the forecasting of groundwater environmental pollutions caused by Chemical Oxygen Demand (COD) leakage, ash yard, and power plants. Results: Through the application of numerical simulation technology, the current information about groundwater pollution, such as the scope of impact and the movement law of pollution, can be understood clearly and timely. Conclusion: By applying the numerical simulation technology in forecasting groundwater pollution, the groundwater pollution problems can be prevented effectively, which offers great help to the correct and reasonable operation and development of coal-fired power plants, which provides a significant reference for the preventive treatment of groundwater pollution.

Design Technology of Large-scale Spiral Wound Heat Exchanger in Refinery Industry

Due to its excellent heat transfer property, good adaptability to variable loads and operation reliability, large-scale spiral wound heat exchanger (SWHE) has a bright application prospect in the refinery industry of China. With respect to the large-scale hydrocracking unit, both the new heat transfer process and the SWHE design technology are analyzed. As to the design of heat transfer process, high pressure SWHE instead of traditional thread locking ring heat exchanger (TLRHE) is employed, which reduces the number of reaction furnaces and obtains remarkable energy-economizing effect. As to the design innovation of high pressure SWHE, such contents as the structure style, adaptability of whole structure, requirement of material selection, structure of Ni-base alloy butt weldment, design calculation of main structure, technology requirement of high pressure finish-rolling heat exchange tube and design specification of the minimum center tube etc. are discussed. In China, the large-scale refinery SWHE with area larger than 10000m2 can be produced now, and abundant experience has been accumulated in the design technology. However, there is still a certain gap between our country and the advanced countries in Europe and America in such aspects as the material variety of SWHE, the diversity of heat exchange tube specification, the application of numerical simulation technology in design and the inspection and repair technology of high pressure SWHE etc.

Application of Numerical Simulation Technology in the Large Space Air-Conditioned Buildings Air-Conditioned Buildings

This paper takes the large space air-conditioned buildings air-conditioned buildings as research subjects and sets numerical conditions of large space air-conditioned buildings prototype to conduct a simulation study by means of numerical simulation.Numerical and experimental results show that the standard k-εturbulence model can be used to describe the characteristics of the large space air-conditioned buildings building;the experimental results of a typical location room temperature basically consistent with the numerical results of the prototype and enlarged model.Results of this study will provide a useful reference for the researches of large space air-conditioned buildings air-conditioned building.

The Application of Numerical Simulation Technology in Road Engineering

In order to analyze the contact stresses between dowels and surrounding concrete in the dowel-jointed cement concrete pavement, the 3-D finite element model is used to simulate the stress concentration in concrete around the dowel bars under traffic loading. The stress and strain responses on the concrete surface have been calculated and they are also verified with self-design full-scale experiments. Results show that the strain data from the numerical simulation agrees well with the full-scale experiment. As a result, the research indicates that the 3-D finite element model is an efficient and accurate method to calculate the interaction characteristics between dowel bars and surrounding concrete. Besides, the high press stress concentration on the concrete up dowels and the tensile stress concentration on the concrete besides dowels will cause the initial crack development in the concrete material surrounding the dowels, which is the main reason leading to the dowel bar deterioration. In this paper, a more concrete and detailed numerical analysis method will be provided to analysis the stresses concentration at steel-concrete interface in the concrete structure.

The Application of Numerical Simulation Technology in the External Aerodynamic Noise Field of High-Speed Train

This paper utilized the Boundary Element Method (BEM) combined with the Computational Fluid Dynamics (CFD) based on Lighthill’s analogy in the high-speed train model, and converted the fluctuating flow pressure near the vehicle’s surface into the dipole source boundary condition in acoustics grid, eventually succeeded in completing the numerical simulation of aerodynamic noise field outside the high-speed train by introducing the dipole source boundary condition into the train BEM model. The results show that the main aerodynamic noise controlling area is 15-20 meters away from the track center line in the horizontal direction, and the Sound Press Level (SPL) is 63-72dB.

Application of Numerical Simulation in Stamping Process of Complex Box-Type Parts

Due to the recent development both in the numerical simulation technology and computer technology, the role of numerical simulation in sheet forming industry has been continuously increasing in recent years. This paper describes the application of numerical simulation technology in the forming process of a complex box-type part with Dynaform and gives a fairly accurate forecast of defects that may appear in the forming process. Prediction of the effect of design parameters such as blank holding force and drawbeads on forming quality is investigated. The study indicates that blank holding force and drawbead directly affect the metal flow and formability of stamping. Then, by adjusting blank holding force and setting appropriate drawbeads, an optimized stamping process plan is obtained and is validated in experiments. Finally the phenomenon and displacement of distortion springback are predicted in the springback simulation, which is useful to further improve the quality of this kind of part.

Application of Numerical Simulation Technology in Power and Social Infrastructure-related R & D

Application of Numerical Simulation Technology in Power and Social Infrastructure-related R & D

Application of Numerical Simulation Technology on the Design of Camera Shell during Die Casting Process

The technology of computer numerical simulation on casting process is an important frontal field of material science and technology. The numerical simulations of camera shell in the pressure die casting process were carried out. The distributions of temperature and solidification time in the filling process were obtained. Based on the simulated results and the Niyama criterion G/ R , the positions of slack were predicted, which were agreement with the practical result. Consequently, an improved scheme was presented, in which the workpiece defects were obviously reduced. So it’s significant for the application of numerical simulation on improving the quality of the casting, shortening the period of producing, reducing the cost and guiding the engineer for taking reasonable method to optimize the technological design.

AIR LIQUIDE HYDROGEN PLANT FOR BASF

Due to its excellent heat transfer property, good adaptability to variable loads and operation reliability, large-scale spiral wound heat exchanger (SWHE) has a bright application prospect in the refinery industry of China. With respect to the large-scale hydrocracking unit, both the new heat transfer process and the SWHE design technology are analyzed. As to the design of heat transfer process, high pressure SWHE instead of traditional thread locking ring heat exchanger (TLRHE) is employed, which reduces the number of reaction furnaces and obtains remarkable energy-economizing effect. As to the design innovation of high pressure SWHE, such contents as the structure style, adaptability of whole structure, requirement of material selection, structure of Ni-base alloy butt weldment, design calculation of main structure, technology requirement of high pressure finish-rolling heat exchange tube and design specification of the minimum center tube etc. are discussed. In China, the large-scale refinery SWHE with area larger than 10000m2 can be produced now, and abundant experience has been accumulated in the design technology. However, there is still a certain gap between our country and the advanced countries in Europe and America in such aspects as the material variety of SWHE, the diversity of heat exchange tube specification, the application of numerical simulation technology in design and the inspection and repair technology of high pressure SWHE etc.