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  • Open Access

    ARTICLE

    Simulation of Three-dimensional Complex Flows in Injection Molding Using Immersed Boundary Method

    Qiang Li1

    CMES-Computer Modeling in Engineering & Sciences, Vol.94, No.3, pp. 207-224, 2013, DOI:10.32604/cmes.2013.094.207

    Abstract In this paper, an immersed boundary method (IBM) has been developed to simulate three-dimensional (3D) complex flows in the injection molding process, in which the irregular boundary of mould is treated by a level set function. The melt front (melt-air interface) is captured and treated using the coupled level set and volume of fluid (CLSVOF) method. The finite volume method on the nonstaggered meshes is implemented to solve the governing equations, and the melt filling process is simulated in a rectangular mould with both thick- and thin-wall sections. The numerical result shows good agreement with More >

  • Open Access

    ARTICLE

    Numerical Analysis of the Gas Injection Rate in Z12V190 Diesel Tail Gas Drilling

    Xuejun Hou1,2, Deli Gao1,3, Zhonghou Shen1

    CMES-Computer Modeling in Engineering & Sciences, Vol.90, No.1, pp. 1-16, 2013, DOI:10.3970/cmes.2013.090.001

    Abstract Diesel tail gas drilling (DTGD) is a type of gas drilling, which uses diesel tail gas (DTG) as a circulating medium. Its cost is slightly higher than that of air drilling, but is cheaper than those of nitrogen drilling and natural gas drilling. When the reservoir is drilled with DTG, just as nitrogen and natural gas, the DTG will prevent the burning and blasting of oil and gas in the bottom hole. In order to reduce costs, the DTG is often used in drilling the reservoir, to prevent the underground explosion. This paper analyzes the… More >

  • Open Access

    ARTICLE

    NUMERICAL AND EXPERIMENTAL RESEARCH IN HEAT TRANSFER TO SCREW COMPRESSOR ROTORS*

    Nikola Stosic**, Ian K. Smith, Ahmed Kovacevic

    Frontiers in Heat and Mass Transfer, Vol.3, No.2, pp. 1-7, 2012, DOI:10.5098/hmt.v3.2.3003

    Abstract Due to fast rotation of screw compressor rotors, temperature is uniform in the rotor cross section and temperature field is a function of the axial coordinate only. Apart of that the rotors in one cross section the rotors are simultaneously heated by hot gas on one side while cooled at another side by cold gas. As a result of identification of the main modes of heat transfer both in the rotors and between the rotors and their surroundings and the relative significance of each, a novel procedure is suggested to cool the rotors by injection… More >

  • Open Access

    ARTICLE

    Use of Flow Simulation to Develop Robust Injection and Vent Schemes that Account for Process and Material Variability in Liquid Composite Molding Process

    J. Wang1, E. Andres, P. Simacek, S.G.Advani

    CMES-Computer Modeling in Engineering & Sciences, Vol.88, No.3, pp. 155-182, 2012, DOI:10.3970/cmes.2012.088.155

    Abstract In Liquid Composite Molding (LCM) processes, the process design requires an infusion and venting scheme which will saturate all the empty spaces between the fibers during mold filling resulting in a composite part without voids. However, the inherent material and process variability can change the filling patterns significantly which complicate this task. The objective of this work is to develop methodologies and tools to automate infusion process design and integrate it within the CAD design environment. The methodologies and algorithms developed examine the designed part geometry and material layups for ease of manufacturing with feasible… More >

  • Open Access

    ARTICLE

    Enhanced Heat Transfer by Unipolar Injection of Electric Charges in Differentially Heated Dielectric Liquid Layer

    Walid Hassen1, Mohamed Naceur Borjini2, Habib Ben Aissia1

    FDMP-Fluid Dynamics & Materials Processing, Vol.8, No.4, pp. 381-396, 2012, DOI:10.3970/fdmp.2012.008.381

    Abstract In this work we consider the problem related to the electro-thermo-convection of a dielectric fluid in a rectangular enclosure placed between two electrodes. This layer is subjected simultaneously to the injection of electric charges and to a thermal gradient. The influence of the electric Rayleigh number (200 - 1000) on the structure of the flow, the density of electric charge and heat transfer is investigated. An oscillatory flow is observed and discussed in detail. More >

  • Open Access

    ABSTRACT

    Application of a Multiple Well-Injection Approach for CO2 Sequestration in a Saline Reservoir

    Chien-Hao Tseng, Chia-Chen Kuo, Wei-Chih Su, Fang-An Kuo, Keni Zhang, Chuan-Lin Lai

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.17, No.1, pp. 23-24, 2011, DOI:10.3970/icces.2011.017.023

    Abstract The high-performance parallel computing scheme has already been increasingly recognized as an attractive alternative method to resolve the large-scale problems of CO2 sequestration. This paper therefore conducts a parallel computation for simulating multiple well-injection scenarios and long-term CO2 geologic sequestration in a saline aquifer (Figure 1a) based on the ECO2N module of the TOUGH2-MP that is the parallel version of TOUGH2 implemented by the MPI. The numerical performance of TOUGH2-MP is developed on an IBM Cluster 1350 which is composed of 404 nodes and 2 Intel Woodcrest 3.0 Ghz Dual-Core processors per node. Our results More >

  • Open Access

    ABSTRACT

    Simulation Study of Hydrogen Injection into Graphite

    A. Takayama, S. Saito, A. M. Ito, S. Yonemura, H. Nakamura

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.3, pp. 83-84, 2011, DOI:10.3970/icces.2011.019.083

    Abstract We have been developing a molecular dynamics (MD) simulation code, a binary collision approximation (BCA) based simulation code, and a BCA-MD hybrid simulation code. In this paper, an overview of the codes is presented. BCA-based simulation results of hydrogen isotopes injection into graphite target are also shown. Detailed description is given as a full abstract. More >

  • Open Access

    ABSTRACT

    Improved material point method for simulating the zona failure response in piezo-assisted intracytoplasmic sperm injection

    Y. Gan, Z. Chen, S. Montgomery-Smith

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.18, No.2, pp. 59-60, 2011, DOI:10.3970/icces.2011.018.059

    Abstract The material point method (MPM), which is an extension from computational fluid dynamics (CFD) to computational solid dynamics (CSD), is improved for the coupled CFD and CSD simulation of the zona failure response in piezo-assisted intracytoplasmic sperm injection (piezo-ICSI). To evaluate the stresses at any zona material point, a plane stress assumption is made in the local tangent plane of the membrane point, and a simple procedure is proposed to find the effective point connectivity for the orientation of the local tangent plane. With an iterative algorithm in each time step, the original MPM is More >

  • Open Access

    ARTICLE

    Numerical Simulation of Gas-assisted Injection Molding Process for A Door Handle

    Qiang Li, Jie Ouyang1, Xuejuan Li2, Guorong Wu2, Binxin Yang2

    CMES-Computer Modeling in Engineering & Sciences, Vol.74, No.3&4, pp. 247-268, 2011, DOI:10.3970/cmes.2011.074.247

    Abstract A unified mathematical model is proposed to predict the short shot, primary and secondary gas penetration phenomenon in gas-assisted injection molding (GAIM) process, where the Cross-WLF model and two-domain modified Tait equation are employed to simulate the melt viscosity and density in the whole process, respectively. The governing equations of two-phase flows including gas, air and polymer melt are solved using finite volume method with SIMPLEC technology. At first, two kinds of U-shaped gas channels are modeled, where the shape corner and generous corner cases are studied. At last, as a case study, the short More >

  • Open Access

    ARTICLE

    Numerical Simulation of Melt Filling and Gas Penetration in Gas Assisted Injection Molding

    Qiang Li1, Jie Ouyang1, Guorong Wu1, Xiaoyang Xu1

    CMES-Computer Modeling in Engineering & Sciences, Vol.82, No.3&4, pp. 215-232, 2011, DOI:10.32604/cmes.2011.082.215

    Abstract The governing equations of two-phase flows including gas and polymer melt are presented, which are solved using finite volume and domain extension methods with SIMPLEC technology. The melt filling and primary gas penetration in gas-assisted injection molding (GAIM) process are simulated, where the Cross-viscosity model is employed to describe the melt rheological behavior, and the CLSVOF(coupled Level Set and Volume of fluid) method is employed to capture the moving interfaces. In order to test and verify the coupled methods, melt filling in a rectangular plate with an insert is simulated, and the numerical results are More >

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