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Shear-driven flow between a rotating cylinder and a stationary elliptical enclosure is studied in this paper. Two-dimensional time-dependent Navier–Stokes equations are solved using a meshless method, where interpolations are done with polyharmonic spline radial basis functions. The fluid flow is analyzed for various aspect ratios of the ellipse and eccentric placements of the inner cylinder. Contour plots of vorticity with streamlines, plots of non-dimensional torque, and the angle of eye of the primary vortex are presented in the paper for Reynolds numbers between 200 and 2000. Formation of Moffatt like vortices in the wide-gap region of the model is observed, and some benchmark data are provided for various cases that are simulated.

Nipah virus infection is a newly emerging zoonotic disease that spreads from animal to human. The fruit bats are the one of the carriers of Nipah virus which gets transmitted from bats to other animals mainly through body fluids. Nipah can cause asymptomatic infection to the acute respiratory syndrome and fatal encephalitis in human beings with a dreadful mortality rate of 70 per cent. This review article focused on role of bats in ecosystem and preventive measure to contain the virus by improving public health. In 2018 the outbreak of Nipah in Kerala state of India claimed 17 lives. It has indeed opened Pandora’s box exposing the role of general public, health department and social media and so on. The early detection and the well-oiled medical infrastructure in the state did wonders. Though social media have been accused of spreading misinformation leading to culling of bats, the people of Kerala responded with positive frame of mind. Prompt and synchronized efforts of all stakeholders like health workers, state government, scientists, researchers and central government led to timely and successful control of Nipah virus cases in Kerala.

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