Faculty Publications

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Subject: search.filters.subject.Finite element method (FEM)

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    Numerical Analysis of Geocell Retaining Wall for Slope Stabilization of Netravathi River Bank
    (Springer Science and Business Media Deutschland GmbH, 2025) Anjana, S.; Menon, V.; Kolathayar, S.
    Stability of slopes is a major concern when it comes to construction near hills, excavations, embankments and river banks. Geosynthetics and geotextiles have proven to be extremely efficient in slope stabilization and landslide protection, among which the use of geocells has been drastically increasing. It is made up of geogrid like materials that give it sufficient tensile strength. This paper focuses on the use of geocells to construct a retaining wall to support an existing backfill. The study area is located at a Netravathi River bank which belongs to a temple in South Mangalore city. The aim of the work is to prevent flooding of the temple during heavy rainfall and the erosion of banks. Numerical analyses have been carried out by Limit Equilibrium Method (LEM) using GEO5 software and Finite Element Method (FEM) using PLAXIS 2D software. The results of displacements and factor of safeties have been compared for both methods to determine if the proposed structure is stable. Geocell retaining wall has been developed in PLAXIS 2D using a soil geocell equivalent composite model due to the difficulties of modelling its actual honeycomb like structure. The structure gives sufficient safety for static as well as pseudo static condition for different water levels hence preventing further erosion of existing soil. The design provided for the present work gives a factor of safety of 1.69 in LEM analysis and 1.90 in FEM analysis for the rapid drawdown condition in a psuedo dynamic analysis. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.
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    Comparative analysis of steady state heat transfer in a TBC and functionally graded air cooled gas turbine blade
    (2010) Coomar, N.; Kadoli, R.
    Internal cooling passages and thermal barrier coatings (TBCs) are presently used to control metal temperatures in gas turbine blades. Functionally graded materials (FGMs), which are typically mixtures of ceramic and metal, have been proposed for use in turbine blades because they possess smooth property gradients thereby rendering them more durable under thermal loads. In the present work, a functionally graded model of an air-cooled turbine blade with airfoil geometry conforming to the NACA0012 is developed which is then used in a finite element algorithm to obtain a non-linear steady state solution to the heat equation for the blade under convection and radiation boundary conditions. The effects of external gas temperature, coolant temperature, surface emissivity changes and different average ceramic/metal content of the blade on the temperature distributions are examined. Simulations are also carried out to compare cooling effectiveness of functionally graded blades with that of blades having TBC. The results highlight the effect of including radiation in the simulation and also indicate that external gas temperature influences the blade heat transfer more strongly. It is also seen that graded blades with about 70% ceramic content can deliver better cooling effectiveness than conventional blades with TBC. © 2010 Indian Academy of Sciences.