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Quantification of nonlinear seismic response of rectangular liquid tank
Santosh Kumar Nayak,Kishore Chandra Biswal 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.5
Seismic response of two dimensional liquid tanks is numerically simulated using fully nonlinear velocity potential theory. Galerkin-weighted-residual based finite element method is used for solving the governing Laplace equation with fully nonlinear free surface boundary conditions and also for velocity recovery. Based on mixed Eulerian-Lagrangian (MEL) method, fourth order explicit Runge-Kutta scheme is used for time integration of free surface boundary conditions. A cubic-spline fitted regridding technique is used at every time step to eliminate possible numerical instabilities on account of Lagrangian node induced mesh distortion. An artificial surface damping term is used which mimics the viscosity induced damping and brings in numerical stability. Four earthquake motions have been suitably selected to study the effect of frequency content on the dynamic response of tank-liquid system. The nonlinear seismic response vis-a-vis linear response of rectangular liquid tank has been studied. The impulsive and convective components of hydrodynamic forces, e.g., base shear, overturning base moment and pressure distribution on tank-wall are quantified. It is observed that the convective response of tank-liquid system is very much sensitive to the frequency content of the ground motion. Such sensitivity is more pronounced in shallow tanks.
Quantification of nonlinear seismic response of rectangular liquid tank
Nayak, Santosh Kumar,Biswal, Kishore Chandra Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.5
Seismic response of two dimensional liquid tanks is numerically simulated using fully nonlinear velocity potential theory. Galerkin-weighted-residual based finite element method is used for solving the governing Laplace equation with fully nonlinear free surface boundary conditions and also for velocity recovery. Based on mixed Eulerian-Lagrangian (MEL) method, fourth order explicit Runge-Kutta scheme is used for time integration of free surface boundary conditions. A cubic-spline fitted regridding technique is used at every time step to eliminate possible numerical instabilities on account of Lagrangian node induced mesh distortion. An artificial surface damping term is used which mimics the viscosity induced damping and brings in numerical stability. Four earthquake motions have been suitably selected to study the effect of frequency content on the dynamic response of tank-liquid system. The nonlinear seismic response vis-a-vis linear response of rectangular liquid tank has been studied. The impulsive and convective components of hydrodynamic forces, e.g., base shear, overturning base moment and pressure distribution on tank-wall are quantified. It is observed that the convective response of tank-liquid system is very much sensitive to the frequency content of the ground motion. Such sensitivity is more pronounced in shallow tanks.
Swarup Kumar Nayak,Santosh Kumar Nayak,Purna Chandra Mishra,Srinibas Tripathy 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.9
The standard configuration parameters of a Variable compression ratio (VCR) engine neglect to give specific execution with biodieselfrom distinctive origins. Alongside, a bunch of exploration of diversified biodiesel over performance and emission analysis, extremelyconstrained work has been taken out on combustion analysis with VCR. This survey was performed to identify the impact of compressionratio on the combustion characteristics of a diesel engine fueled with Calophyllum inophyllum oil methyl ester (COME) and itsblends with diesel. Experiments were conducted at a fixed speed of 1500 RPM, full load and at different compression ratios of 16:1, 17:1and 18:1. Results, revealed that combustion duration of Calophyllum inophyllum oil was more, while the ignition delay period was shorterthan that of diesel.
Adhikari, Amrita De,Oraon, Ramesh,Tiwari, Santosh Kumar,Saren, Pupulata,Lee, Joong Hee,Kim, Nam Hoon,Nayak, Ganesh Chandra American Chemical Society 2018 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.57 No.5
<P>CoFe<SUB>2</SUB>O<SUB>4</SUB> nanospheres ornamented CdS nanorods were successfully assembled over the reduced graphene oxide nanosheets. Such hierarchical morphology established by field emission scanning electron microscopy and transmission electron microscopy studies, with high surface area offered a high specific capacitance of 1487 F g<SUP>–1</SUP> at a current density of 5 A g<SUP>–1</SUP> owing to fast diffusion of ions, facile transportation of electrons, and great synergism between the components, which led to reversible redox reactions. Furthermore, the electrode material has specific capacitance retention of 78% up to 5000 cycles, thus demonstrating its good reversibility and cyclic stability. The resulting CdS-CoFe<SUB>2</SUB>O<SUB>4</SUB>@reduced graphene oxide nanohybrid can deliver excellent electrochemical performance and can be a potential candidate for supercapacitor application.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2018/iecred.2018.57.issue-5/acs.iecr.7b04885/production/images/medium/ie-2017-04885n_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie7b04885'>ACS Electronic Supporting Info</A></P>