Ravi Singh

Linear stability analysis for monami in a submerged seagrass bed

Amala Mahadevan Woods Hole Oceanographic Institution, Woods Hole MA 02543 USA Abstract The onset of monami – the synchronous waving of sea grass beds driven by a steady flow – is modeled as a linear instability of the flow. Our model treats the drag exerted by the grass in establishing the steady flow profile, and in damping out perturbations to it. This damping leads to a finite threshold flow for the instability, which agrees with experimental observations. This role of vegetation drag differentiates our mechanism from the previous hypothesis that the Kelvin-Helmholtz instability underlies monami.

Local Structure of Iridate Pyrochlores from Hydrothermal Synthesis

H. Playford, R. Singh, L. Chang, K. Sardar, A. Hannon, M. Tucker, M. Lees, G. Balakrishnan, R. Walton STFC ISIS Facility, Harwell Oxford, Rutherford Appleton Laboratory, Didcot, UK, IISER-Bhopal, Department of Physics, MP-462023, India, National Cheng Kung University, Department of Physics, Tainan, Taiwan, Diamond Light Source Ltd, Harwell Oxford, Didcot, UK, University of Warwick, Department of Physics, Coventry, UK, University of Warwick, Department of Chemistry, Coventry, UK