Lihua Wang^1,*, Zheng Zhong¹

CMES-Computer Modeling in Engineering & Sciences, Vol.114, No.1, pp. 1-18, 2018, DOI:10.3970/cmes.2018.114.001

Abstract A semi-analytical form of complex modal analysis is proposed for the time-variant dynamical problem of rotating pipe conveying fluid system. The complex mode superposition method is introduced for the dynamic analysis in the time and frequency domains, in which appropriate orthogonality conditions are constructed to decouple the time-variant equation of motion. Consequently, complex frequencies and modes of vibration are analytically formulated and the variations of frequencies and damping of the system are evaluated. Numerical time-variant example of rotating pipe conveying fluid illustrates the effectiveness and accuracy of this method. Furthermore, the proposed solution scheme is also applicable to other similar… More >

M. Dehghan¹, M. Abbaszadeh², A. Mohebbi³

CMES-Computer Modeling in Engineering & Sciences, Vol.107, No.6, pp. 481-516, 2015, DOI:10.3970/cmes.2015.107.481

Abstract In the current paper the two-dimensional time fractional Klein-Kramers equation which describes the subdiffusion in the presence of an external force field in phase space has been considered. The numerical solution of fractional Klein-Kramers equation is investigated. The proposed method is based on using finite difference scheme in time variable for obtaining a semi-discrete scheme. Also, to achieve a full discretization scheme, the Kansa's approach and meshless local Petrov-Galerkin technique are used to approximate the spatial derivatives. The meshless method has already proved successful in solving classic and fractional differential equations as well as for several other engineering and physical… More >

Lin LU, Bin TENG, Bing CHEN

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 133-134, 2011, DOI:10.3970/icces.2011.019.133

Abstract This work describes the numerical implements of a two-dimensional viscous numerical wave flume, which is based on the Finite Element Method (FEM), Computational lagrangian-Eulerian Advection Remap Volume of Fluid Method (CLEAR-VOF), internal wave generation and artificial wave damping technique. Owning to the inherent consistence of CLEAR-VOF with FEM, the present numerical model allows the simulations of wave propagation and interaction with structures to be simulated with irregular mesh partition. The present numerical wave flume is validated by several applications in comparisons with available experimental data and numerical results, including the problems of standing wave trains in front of vertical wall,… More >

Hua Qiao, Wei-Qiu Chen

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 131-132, 2011, DOI:10.3970/icces.2011.019.131

Abstract The Arlequin method was first proposed by Ben Dhia aiming to provide an efficient analysis of engineering structures with some local-global property. Using reliable energy partition function and coupling operators, the Arlequin method can be used to couple two different mechanical states to conduct multi-scale or multi-model simulations.
This study explores the various applications of the Arlequin method to multi-scale or multi-model simulation of structures. The Arlequin method has been implemented into the large commercial finite element software ABAQUS by using the user defined elements (UELs). The 1D, 2D and 3D UELs have been systematically developed within the Lagrange-multipler… More >

Neha Satak, John E Hurtado

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 129-130, 2011, DOI:10.3970/icces.2011.019.129

Abstract Rigid Body Reorientation with Two Impulses: Two-axis and Single-axis Thrust Cases More >

Elena Jakubikova, David N. Bowman

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 127-128, 2011, DOI:10.3970/icces.2011.019.127

Abstract The Sun is an abundant source of energy capable of meeting all our energy needs if properly harvested. Some of the ways to utilize solar energy is conversion of sunlight to electricity via photovoltaic solar cells or to chemical fuels via photocatalytic synthetic cells. Many of such systems are designed around a photoactive molecule (a chromophore) anchored to a semiconductor. The conversion of sunlight to electricity occurs via absorption of light by the chromophore, followed by the interfacial electron transfer between the chromophore and semiconductor. We investigate the use of Fe(II)-polypyridine compounds as chromophores in the molecular assemblies for solar… More >

Hyung-Jo Jung, Jong-Jae Lee, Jeong-Su Park

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 125-126, 2011, DOI:10.3970/icces.2011.019.125

Abstract A vision-based displacement measurement method for structural health monitoring of large-scale infrastructures such as high-rise buildings and long-span bridges is presented. The method uses digital image processing techniques including a target recognition algorithm, projection of the captured image, and calculation of the actual displacement using target geometry and the number of pixels moved. To measure the displacement of a flexible structure from a distant location which can be regarded as a fixed reference point, a novel image processing method has been devised by means of successive estimation of relative displacement and rotational angle using a synchronized vision-based system. By measuring… More >

Yufeng Nie, Yu Zhang, Yiqiang Li, Gu YT

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 123-124, 2011, DOI:10.3970/icces.2011.019.123

Abstract When the set of nodes distributed randomly is applied to approximate function, the size of the domain support of point has a great influence on the validity and accuracy of approximation. In order to study the radius of the support domain, this paper gives a new concept of the node density firstly, which not only can characterize the density level of distribution of the node and its calculation algorithm is simple, but also is easy to determine the radius of the support domain; Secondly, based on the concept of the node density, an algorithm which is used to search nodes… More >

C. J. ZHENG, H. B. CHEN, T. MATSUMOTO, T. TAKAHASHI

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 121-122, 2011, DOI:10.3970/icces.2011.019.121

Abstract A fast multipole boundary element method is presented for three dimensional acoustic shape sensitivity analysis in this study. The Burton-Miller formula which is a linear combination of the conventional boundary integral equation and the normal derivative boundary integral equation is adopted to conquer the fictitious eigenfrequency problem associated with the conventional boundary integral equation method in solving exterior acoustic problems. The continuous adjoint variable method is implemented in the sensitivity analysis and the concept of material derivative is used in the derivation. Constant elements are employed to discretize the boundary so that the hypersingular boundary integrals contained in the formulae… More >

Guojian Li, Qiang Wang, Yongze Cao, Jiaojiao Du, Jicheng He

The International Conference on Computational & Experimental Engineering and Sciences, Vol.19, No.4, pp. 119-120, 2011, DOI:10.3970/icces.2011.019.119

Abstract This paper studies the size-dependent freezing of Co, Co-Ni, and Co-Cu clusters by using molecular dynamics with a general embedded atom method. There is size effect occurs in these three types of clusters. The clusters with large sizes always freeze to form their bulk-like structures. However, the frozen structures for small sizes are generally related to their compositions. The icosahedral clusters are formed for Co clusters (for 3.2 nm diameter) and also for Co-Ni clusters but at a larger size range (for 4.08 nm). Upon Co-Cu clusters, decohedral structure is obtained for small size (for 2.47 nm). The released energy… More >