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physics.flu-dyn2018
Explosive instability due to flow over a rippled bottom
Raunak Raj, Anirban Guha
In this paper, we study Bragg resonance, i.e. the triad interaction between surface and/or interfacial waves with bottom ripple, in presence of background velocity. We show that wh…
physics.flu-dyn2017
Large density stratification stabilizes Rayleigh-Taylor instability in presence of shear
Raunak Raj, Anirban Guha
This letter investigates the effect of shear on Rayleigh-Taylor instability (RTI). Even simple uniform shear strongly influences the instability; longer waves are completely stabil…
physics.flu-dyn2017
On the inertial effects of density variation in stratified shear flows
Anirban Guha, Raunak Raj
In this paper, we first revisit the celebrated Boussinesq approximation in stratified flows. Using scaling arguments we show that when the background shear is weak, the Boussinesq…