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NUMERICAL STUDY ON THE FLOW AROUND A CIRCULAR CYLINDER WITH SURFACE SUCTION OR BLOWING USING VORTICITY-VELOCITY METHOD 被引量:2
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作者 LING Guo-ping(凌国平) +1 位作者 FANG Jian-wen(方健雯) 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2002年第9期1089-1096,共8页
A vorticity-velocity method was used to study the incompressible viscous fluid flow around a circular cylinder with surface suction or blowing. The resulted high order implicit difference equations were effeciently so... A vorticity-velocity method was used to study the incompressible viscous fluid flow around a circular cylinder with surface suction or blowing. The resulted high order implicit difference equations were effeciently solved by the modified incomplete LU decomposition conjugate gradient scheme ( MILU-CG). The effects of surface suction or blowing' s position and strength on the vortex structures in the cylinder wake, as well as on the drag and lift forces at Reynoldes number Re = 100 were investigated numerically. The results show that the suction on the shoulder of the cylinder or the blowing on the rear of the cylinder can effeciently suppress the asymmetry of the vortex wake in the transverse direction and greatly reduce the lift force; the suction on the shoulder of the cylinder, when its strength is properly chosen, can reduce the drag force significantly, too. 展开更多
关键词 circular cylinder with surface suction or blowing separated vortex flow around bluff body and its control vorticity-velocity method preconditioned conjugate gradient method
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A FINITE ELEMENT SOLVER FOR NAVIER-STOKES EQUATIONS VIA VORTICITY AND VELOCITY
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作者 Zhu Jiang Abimael F D Loula Laboratório Nacional de Computaco Científica, MCT,Av Getúlio Vargas 333, 25651 070 Petrópolis, RJ, Brazil 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2001年第z1期115-118,共4页
The incompressible Navier Stokes equations are solved via variables of vorticity and velocity. Firstly, a rigorous variational framework with the equivalence between the velocity pressure and the vorticity velocity fo... The incompressible Navier Stokes equations are solved via variables of vorticity and velocity. Firstly, a rigorous variational framework with the equivalence between the velocity pressure and the vorticity velocity formulations is presented in a Lipschitz domain. Next, a class of Galerkin finite element approximations of the corresponding variational form is introduced, and a convergence analysis is given for the Stokes problem. Finally, an iterative finite element solver for the Navier Stokes problem is proposed. 展开更多
关键词 INCOMPRESSIBLE NAVIER-STOKES equations vorticity-velocity formulation finite element APPROXIMATIONS convergence analysis
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A NOTE ON JACOBI SPECTRAL-COLLOCATION METHODS FOR WEAKLY SINGULAR VOLTERRA INTEGRAL EQUATIONS WITH SMOOTH SOLUTIONS 被引量:8
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作者 Yanping Chen Xianjuan Li Tao Tang 《Journal of Computational Mathematics》 SCIE CSCD 2013年第1期47-56,共10页
This work is concerned with spectrM Jacobi-collocation methods for Volterra integral equations of the second kind with a weakly singular of the form (t - s)-a When the underlying solutions are sufficiently smooth, t... This work is concerned with spectrM Jacobi-collocation methods for Volterra integral equations of the second kind with a weakly singular of the form (t - s)-a When the underlying solutions are sufficiently smooth, the convergence analysis was carried out in [Chen & Tang, J. Comput. Appl. Math., 233 (2009), pp. 938-950]; due to technical reasons 1 In this work, we will improve the results to the the results are restricted to 0 〈 μ 〈 1/2. general case 0 〈 μ 〈 1 and demonstrate that the numericl errors decay exponentially in the infinity and weighted norms when the smooth solution is involved. 展开更多
关键词 Volterra integral equations Convergence analysis Spectral-collocation meth-ods.
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Application of Traditional Chinese Medicine Four-diagnostic auxilia-ry apparatus in evaluation of health status and clinical treatment 被引量:8
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作者 Chen Tianyu Niu Tingli +3 位作者 Niu Xin Si Yingchu Yang Xuezhi Ma Liangxiao 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2018年第3期447-451,共5页
OBJECTIVE: To evaluate the application of Traditional Chinese Medicine(TCM) Four-diagnostic Auxiliary Apparatus in disease diagnosis.METHODS: The liver cancer patients and healthy controls were recruited from Shanghai... OBJECTIVE: To evaluate the application of Traditional Chinese Medicine(TCM) Four-diagnostic Auxiliary Apparatus in disease diagnosis.METHODS: The liver cancer patients and healthy controls were recruited from Shanghai Integrated Chinese and Western Medicine Hospital and Beijing University of Traditional Chinese Medicine, respectively. Then, the included subjects were diagnosed by the Four-diagnostic auxiliary apparatus.RESULTS: Thirty liver cancer patients and 30 paired healthy controls were enrolled in this study. Based on the apparatus, the pulse wave velocity was significantly higher in patients compared with controls(P < 0.05). The number of patients with purple tongue and ecchymosis were more than controls(P < 0.05). The number of patients(10%) with yellow tongue coating were higher than the controls(0%). Patients were inclined to be with water type and fire type constitution.CONCLUSION: TCM Four-diagnostic auxiliary apparatus can be applied in clinical diagnosis of body constitution and health status of subjects. It promotes the accuracy and speed for disease diagnosis and TCM standardization. 展开更多
关键词 Liver NEOPLASMS FOUR DIAGNOSTIC meth-ods Equipment and supplies Medicine Chinese traditional MULTI-INFORMATION fusion
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On the Convergence of Two-Step Modulus-Based Matrix Splitting Iteration Methods for a Restricted Class of Nonlinear Complementarity Problems with H_(+) -Matrices 被引量:2
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作者 Rui Li Yan Wang Junfeng Yin 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE CSCD 2018年第1期128-139,共12页
We propose the two-step modulus-based matrix splitting iteration methods for a class of nonlinear complementarity problems.The corresponding convergence the-ory is established when the system matrix is an H_(+)-matrix... We propose the two-step modulus-based matrix splitting iteration methods for a class of nonlinear complementarity problems.The corresponding convergence the-ory is established when the system matrix is an H_(+)-matrix.Theoretical analysis gives the choice of parameter matrix involved based on the H-compatible splitting of the sys-tem matrix.Moreover,in actual implementation,the choices of iterative parameters for two-step modulus-based accelerated overrelaxation methods are studied.Numeri-cal experiments show that the method is efficient and further verify the convergence theorems. 展开更多
关键词 Nonlinear complementarity problems two-step modulus-based matrix splitting meth-ods H_(+)-matrix H-compatible splitting
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Heat, mass, and work exchange networks 被引量:1
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作者 Zhiyou CHEN Jingtao WANG 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2012年第4期484-502,共19页
Heat (energy), water (mass), and work (pres- sure) are the most fundamental utilities for operation units in chemical plants. To reduce energy consumption and diminish environment hazards, various integration me... Heat (energy), water (mass), and work (pres- sure) are the most fundamental utilities for operation units in chemical plants. To reduce energy consumption and diminish environment hazards, various integration methods have been developed. exchange networks (HENs), The application of heat mass exchange networks (MENs), water allocation heat exchange networks (WAHENs) and work exchange networks (WENs) have resulted in the significant saving of energy and water. This review presents the main works related to each network. The similarities and differences of these networks are also discussed. Through comparing and discussing these different networks, this review inspires researchers to propose more efficient and convenient methods for the design of existing exchange networks and even new types of networks including multi-objective networks for the system integration in order to enhance the optimization and controllability of processes. 展开更多
关键词 process system engineering integration meth-ods heat exchange network mass exchange network workexchange network
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ADAPTIVITY IN SPACE AND TIME FOR MAGNETOQUASISTATICS 被引量:1
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作者 Markus Clemens Jens Lang +1 位作者 Delia Teleaga Georg Wimmer 《Journal of Computational Mathematics》 SCIE CSCD 2009年第5期642-656,共15页
This paper addresses fully space-time adaptive magnetic field computations. We describe an adaptive Whitney finite element method for solving the magnetoquasistatic formulation of Maxwell's equations on unstructured ... This paper addresses fully space-time adaptive magnetic field computations. We describe an adaptive Whitney finite element method for solving the magnetoquasistatic formulation of Maxwell's equations on unstructured 3D tetrahedral grids. Spatial mesh re- finement and coarsening are based on hierarchical error estimators especially designed for combining tetrahedral H(curl)-conforming edge elements in space with linearly implicit Rosenbrock methods in time. An embedding technique is applied to get efficiency in time through variable time steps. Finally, we present numerical results for the magnetic recording write head benchmark problem proposed by the Storage Research Consortium in Japan. 展开更多
关键词 Magnetoquasistatics Space-time adaptivity Edge elements Rosenbrock meth-ods Hierarchical error estimator SRC benchmark problem.
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An On-line Finite Element Temperature Field Model for Plate Ultra Fast Cooling Process 被引量:1
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作者 Xiao-lin CHEN Guo-dong WANG +3 位作者 Yong TIAN Bing-xing WANG Guo YUAN Zhao-dong WANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2014年第5期481-487,共7页
Taking the element specific-heat interpolation function into account, a one-dimensional (l-D) finite ele- ment temperature field model for the on-line control of the ultra fast cooling process was developed based on... Taking the element specific-heat interpolation function into account, a one-dimensional (l-D) finite ele- ment temperature field model for the on-line control of the ultra fast cooling process was developed based on the heat transfer theory. This 1-D model was successfully implemented in one 4 300 mm plate production line. To improve the calculation accuracy of this model, the temperature-dependent material properties inside an element were considered during the modeling process. Furthermore, in order to satisfy the real-time requirements of the on-line model, the variable bandwidth storage method and the Cholesky decomposition method were used in the programming to storage the data and carry out the numerical solution. The on-line application of the proposed model indicated that the devia- tion between the calculated cooling stop temperature and the measured one was less than ± 15 ℃. 展开更多
关键词 laminar cooling ultra fast cooling temperature field finite element variable bandwidth storage meth-od Cholesky decomposition method
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A SIMPLE PRECONDITIONED DOMAIN DECOMPOSITION METHOD FOR ELECTROMAGNETIC SCATTERING PROBLEMS
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作者 F. Alouges J. Bo-urguignon-Mirebeau - I D.P. Levadoux 《Journal of Computational Mathematics》 SCIE CSCD 2013年第1期1-21,共21页
We present a domain decomposition method (DDM) devoted to the iterative solution of time-harmonic electromagnetic scattering problems, involving large and resonant cavities. This DDM uses the electric field integral... We present a domain decomposition method (DDM) devoted to the iterative solution of time-harmonic electromagnetic scattering problems, involving large and resonant cavities. This DDM uses the electric field integral equation (EFIE) for the solution of Maxwell problems in both interior and exterior subdomains, and we propose a simple preconditioner for the global method, based on the single layer operator restricted to the fictitious interface between the two subdomains. 展开更多
关键词 Electromagnetism integral equations methods Domain decomposition meth-ods Preconditioning Cavities.
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