Debanjana Basu

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Results of quantum mechanical simulations of the influence of edge disorder on transport in graphene nanoribbon metal-oxide-semiconductor field-effect transistors MOSFETs are reported. The addition of edge disorder significantly reduces ON-state currents and increases OFF-state currents, and introduces wide variability across devices. These effects decrease(More)
This paper presents a methodology for threedimensional numerical simulations of supercooled water droplet trajectories through aeroengine rotating machinery. Both flow and droplets’ governing equations are formulated and solved in the reference frame of rotating blades. A Eulerian-Lagrangian approach is used for the continuous and discrete phases with(More)
Numerical simulations of unsteady flow in a Hartmann resonance tube are carried out with the goal of understanding the effect of jet Mach number on the flow characteristics. The device, which consists of a convergent nozzle facing a closed end tube produces a nearly normal shock that fluctuates in the gap between the nozzle and the tube. Numerical solutions(More)
Scaling of silicon devices is fast approaching the limit where a single gate will fail to retain an effective control over the channel region. Of the alternative devices being researched, silicon nanowire transistors SNWTs show great promise in terms of scalability, performance, and ease of fabrication. In this work, the authors present the results of(More)
Detached Eddy Simulations are performed for unsteady three-dimensional supersonic turbulent flow over an open L/D = 5 cavity at free-stream Mach number of 1.19. Numerical results are obtained from the explicit solution and Shear-Stress-Transport based simulations using the 3 order Roe scheme. Computational results are presented for the unsteady vortex and(More)
In this paper, a three-tier model of phytoplankton, zooplankton and nutrient is considered and stability of different equilibrium points is analyzed along with Hopf-bifurcation around coexisting equilibrium point. Here, we have assumed toxication process as the guiding factor for bloom formation as well as its termination and this process is incorporated(More)
This paper presents computational results for two DES (Detached Eddy Simulation), one hybrid RANS (Reynolds Averaged Navier-Stokes)/ LES (Large Eddy Simulation) and some preliminary results from PANS (Partially Averaged Navier-Stokes) turbulence for simulation of unsteady separated turbulent flows. The models are implemented in a full 3-D Navier Stokes(More)
This paper proposes two DES (Detached Eddy Simulation) model and one hybrid RANS (Reynolds Averaged Navier-Stokes)/ LES (Large Eddy Simulation) model for the simulations of unsteady separated turbulent flows. The two-equation k-ε based models are implemented in a full 3-D Navier Stokes solver and simulations are carried out using a 3 order Roe scheme. The(More)
This paper presents the results of a study conducted to assess hybrid RANS/LES methods in the prediction of separated high-speed flows. The study focuses on the unsteady flow and acoustic fields associated with supersonic flow over an open cavity. Numerical results are obtained from explicit time marching simulations using the 3 order Roe scheme and both(More)
A numerical study is conducted to investigate fluidic control for transonic flow over an open cavity. Numerical results are obtained for the unsteady threedimensional flow with different steady mass injection rates upstream of the cavity. The simulations use a hybrid two-equation turbulence model in the Detached Eddy Simulations (DES) to calculate the flow(More)