Some decades ago J. T. Stuart formulated a theory for nonlinear saturation of hydrodynamically unstable modes. He proposed that an unstable mode, upon gaining sufficient energy, distorts the mean flow. This mean flow distortion reduces the shear, thus reducing the inviscid energy production mechanism which eventually results in a saturation of instability. In a hypersonic […]

Since the Apollo era, space has become an increasingly valuable domain for national security due to diplomatic, informational, and economic reasons. The last few years have seen exponential growth in the launch of space objects and there is an increased interest in having a permanent cislunar presence through the Artemis program. The understanding of motion […]

Shape Memory phenomenon in some intermetallics like NiTi is well known. However, during arbitrary thermomechanical loading, these materials exhibit several other interesting, yet less-understood phenomena. In this talk, Thermal Arrest Memory and associated effects during interrupted phase transformations in shape memory alloys are discussed and some fascinating underpinnings in the associated martensitic transformations are highlighted. […]

Motivated by applications in the aerospace propulsion industry as well as other energy systems, the fundamental study of phase-locked shear-layer instabilities in high-speed impinging jets, has been of research interest for a long time. The study of instabilities is usually conducted with time derivatives of velocity field. However, time-resolved experimental data acquisition using particle image […]