1. Assistant Professor, Dept. of Mathematics, National Defence Academy, Khadakwasla, Pune-411023, India.
2. Professor, Dept. of Computational Fluid Dynamics, International Institute of Information Technology, P-14, Rajiv Gandhi Infotech Park, Hinjawadi, Pune-411057, India; formerly, Senior Research Officer, Mathematical Modelling Centre, Central Water and Power Research Station, Khadakwasla, Pune-411024, India (corresponding author).