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Amended influence matrix method for removal of rigid motion in the interior BVP for plane elasticity
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作者 Yizhou CHEN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2017年第10期1471-1480,共10页
A conventional complex variable boundary integral equation (CVBIE) in plane elasticity is provided. After using the Somigliana identity between a particular fundamental stress field and a physical stress field, an a... A conventional complex variable boundary integral equation (CVBIE) in plane elasticity is provided. After using the Somigliana identity between a particular fundamental stress field and a physical stress field, an additional integral equality is obtained. By adding both sides of this integral equality to both sides of the conventional CVBIE, the amended boundary integral equation (BIE) is obtained. The method based on the discretization of the amended BIE is called the amended influence matrix method. With this method, for the Neumann boundary value problem (BVP) of an interior region, a unique solution for the displacement can be obtained. Several numerical examples are provided to prove the efficiency of the suggested method. 展开更多
关键词 complex variable boundary integral equation (CVBIE) amended influencematrix method removal of rigid body motion Neumann boundary value problem (BVP)
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CVBEM and FVM Computational Model Comparison for Solving Ideal Fluid Flow in a 90-Degree Bend
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作者 Colin Bloor Theodore V. Hromadka II +1 位作者 Bryce Wilkins Howard McInvale 《Open Journal of Fluid Dynamics》 2016年第4期430-437,共9页
While finite volume methodologies (FVM) have predominated in fluid flow computations, many flow problems, including groundwater models, would benefit from the use of boundary methods, such as the Complex Variable Boun... While finite volume methodologies (FVM) have predominated in fluid flow computations, many flow problems, including groundwater models, would benefit from the use of boundary methods, such as the Complex Variable Boundary Element Method (CVBEM). However, to date, there has been no reporting of a comparison of computational results between the FVM and the CVBEM in the assessment of flow field characteristics. In this work, the CVBEM is used to develop a flow field vector outcome of ideal fluid flow in a 90-degree bend which is then compared to the computational results from a finite volume model of the same situation. The focus of the modelling comparison in the current work is flow field trajectory vectors of the fluid flow, with respect to vector magnitude and direction. Such a comparison is necessary to validate the development of flow field vectors from the CVBEM and is of interest to many engineering flow problems, specifically groundwater modelling. Comparison of the CVBEM and FVM flow field trajectory vectors for the target problem of ideal flow in a 90-degree bend shows good agreement between the considered methodologies. 展开更多
关键词 Complex variable boundary Element Method Finite Volume Method Ideal Fluid Flow 90-Degree Bend Computational Fluid Dynamics
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Failure modes of coal containing gas and mechanism of gas outbursts 被引量:10
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作者 HUANG Wei CHEN Zhanqing +2 位作者 YUE Jianhua ZHANG Yu YANG Min 《Mining Science and Technology》 EI CAS 2010年第4期504-509,共6页
In order to explain the mechanism for gas outburst, the process of evolving fractures in coal seams is described using system dynamics with variable boundaries. We discuss the failure modes of coal containing gas and ... In order to explain the mechanism for gas outburst, the process of evolving fractures in coal seams is described using system dynamics with variable boundaries. We discuss the failure modes of coal containing gas and then established the flow rules after failure. The condition under which states of deformation convert is presented and the manner in which these convert is proposed. In the end, the process of gas outbursts is explained in detail. It shows that a gas outburst is a process in which the boundaries of coal seams are variable because of coal failure. If the fractures are not connected or even closed owing to coal/rock stress, fractured zones will retain a certain level of carrying capacity because of the self-sealing gas pressure. When the accumulation of gas energy reaches its limit, coal seams will become unstable and gas outbursts take place. 展开更多
关键词 systems with variable boundaries gas outburst coal containing gas FAILURE flow rule
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Analysis on capabilities of density-based solvers within OpenFOAM to distinguish aerothermal variables in difusion boundary layer 被引量:4
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作者 Shen Chun Sun Fengxian Xia Xinlin 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2013年第6期1370-1379,共10页
Open source feld operation and manipulation(OpenFOAM)is one of the most prevalent open source computational fluid dynamics(CFD)software.It is very convenient for researchers to develop their own codes based on the... Open source feld operation and manipulation(OpenFOAM)is one of the most prevalent open source computational fluid dynamics(CFD)software.It is very convenient for researchers to develop their own codes based on the class library toolbox within OpenFOAM.In recent years,several density-based solvers within OpenFOAM for supersonic/hypersonic compressible flow are coming up.Although the capabilities of these solvers to capture shock wave have already been verifed by some researchers,these solvers still need to be validated comprehensively as commercial CFD software.In boundary layer where diffusion is the dominant transportation manner,the convective discrete schemes'capability to capture aerothermal variables,such as temperature and heat flux,is different from each other due to their own numerical dissipative characteristics and from viewpoint of this capability,these compressible solvers within OpenFOAM can be validated further.In this paper,frstly,the organizational architecture of density-based solvers within OpenFOAM is analyzed.Then,from the viewpoint of the capability to capture aerothermal variables,the numerical results of several typical geometrical felds predicted by these solvers are compared with both the outcome obtained from the commercial software Fastran and the experimental data.During the computing process,the Roe,AUSM+(Advection Upstream Splitting Method),and HLLC(Harten-Lax-van Leer-Contact)convective discrete schemes of which the spatial accuracy is 1st and 2nd order are utilized,respectively.The compared results show that the aerothermal variables are in agreement with results generated by Fastran and the experimental data even if the1st order spatial precision is implemented.Overall,the accuracy of these density-based solvers can meet the requirement of engineering and scientifc problems to capture aerothermal variables in diffusion boundary layer. 展开更多
关键词 Aerothermal variables boundary layer Computational fluid dynamics(CFD) Heat flux Open source Supersonic
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THREE-DIMENSIONAL NUMERICAL MODEL FOR WINDING TIDAL RIVER WITH BRANCHES 被引量:1
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作者 YANG Li-ling WANG Yun-hong +3 位作者 ZHU Zhi-xia XU veng-jun DENG Jia-quan YANG Fang 《Journal of Hydrodynamics》 SCIE EI CSCD 2007年第2期249-254,共6页
Natural rivers are usually winding with branches and shoals, which are difficult to be simulated with rectangular grids. A 3-D current numerical model was established based on the orthogonal curvilinear coordinate sys... Natural rivers are usually winding with branches and shoals, which are difficult to be simulated with rectangular grids. A 3-D current numerical model was established based on the orthogonal curvilinear coordinate system and vertical o coordinate system. The equations were discretisized using a semi-implicit scheme. The "predictor" and "corrector" steps were applied for the horizontal momentum equations to meet the basic requirement that the depth-integrated currents obtained from the equations for 2-D and 3-D modes have identical values. And a modification of traditional method of dry/wet discriminance was proposed to determine accurately the boundary and ensure the continuity of variable boundary in the simulation. This model was verified with the data measured in a winding tidal river with branches in April, 2004. The simulated data of water levels and velocities agree well with the measured ones, and the computed results reveal well the practical flow characteristics, including the vertical secondary flow in a winding reach. 展开更多
关键词 winding tidal river 3-D numerical model semi-implicit scheme variable boundary
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