Udaya Kumar
Research Highlights
Stable numerical scheme for magnetic flowmeter and allied problems
Electromagnetic flowmeter belongs to a class of problems involving rectilinearly moving conductors across an applied magnetic field. At higher conductor velocities, Galekin Finite Element Method leads to oscillations and various up-winding schemes, while addressing the above difficulty leads to different issues. Couple of simple schemes have been suggested, which are not only computationally efficient but provides accurate results. A comparison with the TEAM-9 standard test problem is made in the figure below.
Field radiated by an avalanche
The electromagnetic field produced by an arbitrarily moving point charge has been well documented in the literature. However, during different stages of corona, which involves electron avalanches, a charge separation occurs in space. In other words, it involves a charge varying in time and moving/distributed over space. Novel expressions have been derived for the total field considering avalanches in atmospheric air.
Lightning attachment to aircrafts
Lightning is considered as one of the serious natural threat to aircrafts, particularly for the composite body aircrafts. Suitable protective measures against natural lightning is therefore is considered at the design stage itself. This requires a suitable assessment of the lightning attachment zones, assessment of direct and indirect effects and providing suitable protective measures. The first stage involves a detailed evaluation of the temporal quasistatic electric field and by using the same, assessment of initial attachment regions and its trace as the aircraft moves. Both development of suitable computer code for the same imbibing recent advances in the pertinent area for ground based structures is in progress along with investigations for handling the floating object formed by the aircraft which launches bi-directional leaders.