Informatics Publishing Limited

M. Kavitha Mayilvaganan , P. Mohana ¹, K. B. Naidu ²

Affiliations
1 Department of Mathematics, Sathyabama University, Chennai-119, IN
2 Centre for Remote sensing and Geo informatics, Sathyabama University, Chennai-119, IN

Abstract

The search for new groundwater resource is essential to sustained economic development in arid environment. The purpose of this study was to investigate new water sources using remote sensing and GIS methods. The thematic layers considered in this study are Lithology, Geomorphology, Drainage, Soil, Lineament, Land use and surface water body, which were prepared using the IRS-P6 LISS-III satellite imagery and conventional data. In addition, soil and drainage maps were digitized from published maps. The thematic layers were finally integrated using ArcGIS V 9.2 software to yield a groundwater potential zone map of the study area. Thus, three different groundwater potential zones were identified, namely 'good', 'moderate' and 'poor'. This GIS based output result was validated using water level depth data collected from Institute of Water studies, PWD. Finally, it is concluded that the RS and GIS techniques are very efficient and useful for the identification of groundwater potential zones.

Keywords

Groundwater, GIS, Remote Sensing, Thurinjapuram

Full Text

   

M. V. Shyla ¹, K. B. Naidu ¹, G. Vasanth Kumar ²

Affiliations
1 Department of Mathematics, Sathyabama University, Chennai-600119, IN
2 Department of Aeronautical Engineering, Sathyabama University, Chennai-600119, IN

Abstract

High exposures of hydrogen-cyanide following accidental releases are very toxic. Hence this paper focuses on trace detection of accidental release of hydrogen-cyanide in industries. Computational Fluid dynamic (CFD) simulation of hydrogen-cyanide around circular sensors that is fixed at different locations under steady state condition with laminar and turbulent boundary conditions is performed for trace detection of accidental release of hydrogen-cyanide in industries. The CFD model is generated using Gambit software. CFD analysis is done using Fluent software which employs CFD technique, finite volume method to compute velocity profile, pressure distribution, and streamline pattern. This study provides sufficient details of dynamic flow of hydrogen cyanide which is achieved by designing sensors using CFD simulation. Comparing the velocity magnitudes of low velocity region and pressure values in various models, a variation in velocity magnitude and pressure values are observed around the circular sensors in Model 2, Model 3 and Model 4. But the magnitude of velocity and pressure values around the three sensors in Model 1 remains the same. The results reveal the fact that the flow is disturbed by the placement of sensors in all models except Model 1. Hence Model 1 is considered as the best model in this study. The sensor positions in 4 models are compared using the flow pattern of hydrogen cyanide around the circular sensors in various models. It is identified that the flow is undisturbed by the placement of sensors in Model 1. This information can be used in fixing sensors in an optimal position in industries and indoor environment to increase the efficiency of sensing.

Keywords

Computational Fluid Dynamic Analysis, Finite Volume Method, Fixing Sensor Position, Laminar, Steady Flow, Turbulent

Full Text

   

H. Girija Bai ¹, K. B. Naidu ², G. Vasanth Kumar ³

Affiliations
1 Research Scholar, Sathyabama University, Chennai-600 119, Tamil Nadu, IN
2 Department of Mathematics, Sathyabama University, Chennai-600 119, Tamil Nadu, IN
3 Department of Aeronautical Engineering, Sathyabama University, Chennai-600 119, Tamil Nadu, IN

Abstract

In the present study, Aortic Aneurysms (AA) are investigated using Computational Fluid Dynamics (CFD) softwares Fluent and Gambit. A computational model of AA is developed from computed tomography (CT) scans using MIMICS software. Hemodynamic factors such as velocity magnitude, dynamic pressure, wall shear stress, wall strain, streamline patterns for unsteady flow conditions are discussed in detail. Contours and streamline patterns show how the flow is affected by different input pressure (p = 90.0074 mmHg, 150.0123 mmHg, 180.0148mmHg) and velocity (v = -0.4 m/s, -0.6 m/s, -1.5 m/s) conditions. The interruption of blood flow is visible through high pressure and low velocities in the region of aneurysms. These techniques based on computer flow study are important for understanding the relationship between hemodynamic parameters and risk of rupture. Quantification and decision of multiple aneurysms serve as the ischolar_main for surgical intervention.

Keywords

Aortic Aneurysms, Computational Fluid Dynamics, Contours, Hemodynamic, Mimics, Streamlines

Full Text

   

L. Prasanna Venkatesh ¹, S. Ganesh ¹, K. B. Naidu ¹

Affiliations
1 Department of Mathematics, Sathyabama University, Chennai-600 119, Tamil Nadu, IN

Abstract

In this paper we consider Magnetohydrodynamic viscous oscillatory fully developed flow of stratified fluid in a long vertical narrow rectangular channel with one side being pervious and the other side being impervious. By applying Lubrication approximation and similarity transformation, closed form solutions are obtained. The graphical interpretations of the effects of various parameters related to the problem on transverse and axial velocity profiles are illustrated in detail. The outcome of the investigation reveals that the stratification effects reverse the flow near the center of the channel while magnetohydrodynamic effects make the flow linear closer to the plates. The results obtained give a significant measure to control the flow with the effects of various parameters involved.

Keywords

Channel Flow, Lubrication Approximation, Magnetohydrodynamics, Similarity Transformation, Stokes Flow, Stratification Parameter, Viscous Oscillatory Flow.

Full Text

   

M. Kavitha Mayilvaganan ¹, K. B. Naidu ¹

Affiliations
1 Department of Mathematics, Sathyabama University, Chennai, IN

Abstract

In the recent past, soft computing techniques have been used increasingly in various fields of science and technology for prediction purposes. In particular, Fuzzy has been found useful in the area of groundwater modeling. Since many uncertainties occur in groundwater studies. Fuzzy systems are suitable for uncertain or approximate reasoning, especially for the system with a mathematical model that is difficult to derive. Fuzzy logic allows decision-making with estimated values under incomplete or uncertain information. A major contribution of fuzzy set theory is its capability of representing vague data. As a methodology, fuzzy set theory incorporates imprecision and subjectivity into the model formulation and solution process. In the present study Mamdani Fuzzy Inference systems (MFIS) is used to predict the groundwater levels in Thurinjapuram watershed, Tamilnadu. For performance evaluation, the model predicted output was compared with the actual water level data. Simulation results reveal that fuzzy logic is an efficient and promising tool in hydrology.

Keywords

Fuzzy Logic, Mamdani Fuzzy Inference Systems, Groundwater Level, MATLAB, Observation Wells.

Full Text