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Volume 5, Number 3, September 2016

The present study deals with the numerical modelling for the one dimensional contaminant transport through saturated homogeneous and stratified porous media using meshfree method. A numerical algorithm based on Element free Galerkin method is developed. A one dimensional form of the advective-diffusive transport equation for homogeneous and stratified soil is considered for the analysis using irregular nodes. A FORTRAN program is developed to obtain numerical solution and the results are validated with the available results in the literature. A detailed parametric study is conducted to examine the effect of certain key parameters. Effect of change of dispersion, velocity, porosity, distribution coefficient and thickness of layer is studied on the concentration of the contaminant

Key Words
contaminant transport; irregular nodes; homogenous and stratified porous media; Meshfree methods; Element free Galerkin method

Rupali S and Sawant Vishwas A: Department of Civil Engineering, IIT Roorkee, Roorkee 247667, India

The main purpose of current study is to find the soil effects on natural period of elevated tank. The coupled analytical method is used to assess in this study. The current study presented models which are capable to consider the soil dynamic stiffness changes and fluid- structure interaction effects on natural period of elevated tanks. The basic of mentioned models is extracted from elastic beam and lumped mass theory. The finite element is used to verify the results. It is observed that, external excitation can change the natural period of elevated tanks. Considering the increase of excitation frequency, the natural period will be decreased. The concluded values of natural period in case of soft and very soft soil are more affected from excitation frequency values. The high range of excitation frequency may reduce the natural period values. In addition it is observed that the excitation frequency has no significant effect on convective period compare with impulsive period.

Key Words
ground excitation; analytical model; natural period; elevated tank; impulsive; convective

Pouyan Abbasi Maedeh: International campus, Kharazmi University, No. 49 Mofatteh Ave. Tehran, I.R. Iran

Ali Ghanbari:Faculty of Engineering, Kharazmi University, No. 49 Mofatteh Ave., Tehran, I.R. Iran

Wei Wu: Faculty of Engineering, University of Bodenkultur, Wien, Austria

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