Vaibhav Kukreja's research while affiliated with Naval Postgraduate School and other places

Publications (5)

Article
There are a wide range of applications involving laser propagation through a scattering medium. Very often, a measurement of the scattered light will be taken with the intent of learning some information about the medium. On the contrary, the present work seeks to extract a description of the source of light and its location. A phenomenological mod...
Article
For steady supersonic flow past a solid convex corner surrounded by quiescent gas, if the pressure of the upcoming supersonic flow is lower than the pressure of the quiescent gas, there may appear a strong shock to increase the pressure and then a transonic characteristic discontinuity to separate the supersonic flow behind the shock-front from the...
Article
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In our previous work, we have established the existence of transonic characteristic discontinuities separating supersonic flows from a static gas in two-dimensional steady compressible Euler flows under a perturbation with small total variation of the incoming supersonic flow over a solid right-wedge. It is a free boundary problem in Eulerian coord...
Article
Full-text available
For a two-dimensional steady supersonic Euler flow past a convex cornered wall with right angle, a characteristic discontinuity (vortex sheet and/or entropy wave) is generated, which separates the supersonic flow from the gas at rest (hence subsonic). We proved that such a transonic characteristic discontinuity is structurally stable under small pe...
Article
Full-text available
We establish the well-posedness of compressible vortex sheets and entropy waves in two-dimensional steady supersonic Euler flows over Lipschitz walls under a $BV$ boundary perturbation. In particular, when the total variation of the incoming flow perturbation around the background strong vortex sheet/entropy wave is small, we prove that the two-dim...

Citations

... Recently, the well-posedness theory for the steady supersonic compressible Euler flows through a 2D finitely long nozzle with a contact discontinuity was established in [36]. For other related problems on the steady supersonic contact discontinuity over a wedge with a sharp convex corner, we refer the reader to [14,29,37,[42][43][44][45]48]. The contact discontinuity in the Mach reflections was also studied in [19][20][21]. ...
... For the transonic flow, the stability of flat contact discontinuity in finitely long nozzles was established in [12]. The stability of two-dimensional transonic contact discontinuity over a solid wedge and three-dimensional transonic contact discontinuity were established in [6,7] and [14]. ...
... For the transonic flow, the stability of flat contact discontinuity in finitely long nozzles was established in [12]. The stability of two-dimensional transonic contact discontinuity over a solid wedge and three-dimensional transonic contact discontinuity were established in [6,7] and [14]. ...
... For related cases, when the flows on both sides of the characteristic discontinuity are supersonic, it has been shown to be structurally stable by Chen-Zhang-Zhu [3] in the framework of weak entropy solutions, and the L 1 -stability also holds as established by Chen-Kukreja [5]; when the flow is in an infinite duct and on both sides of the characteristic discontinuity the flows are subsonic, Bae [1] proved that it is stable under small perturbations of the walls of the duct. Characteristic discontinuities appear ubiquitously in Mach reflection and refraction/reflection of shock upon an interface. ...