We report on what is to our knowledge the first scattering experiment of surface waves an accelerating transcritical flow, which in analogue gravity context described by effective spacetime with a black-hole horizon. This has been probed incident co-current wave, partially scatters into outgoing countercurrent wave each side The measured amplitudes are compatible predictions hydrodynamical theory, where kinematical description terms metric exact.

Accelerating/decelerating trans-critical flows (waterfalls/cataracts) are analogous to space-times of black holes/white fountains since the pioneering work Schützhold & Unruh in 2002. A single number is usually employed classify trans-criticality namely local depth Froude which ratio between current speed and celerity long gravity waves light celerity. When former reaches one, water no more able propagate upstream: hydraulic hole a river return for them. At higher level understanding, two...

We report observations made on a run of transcritical flows over an obstacle in narrow channel. Downstream from the obstacle, decelerate supercritical to subcritical, typically with undulation subcritical side (known hydrodynamics as undular hydraulic jump). In Analogue Gravity context, this transition corresponds white-hole horizon. Free-surface deformations are analyzed, mainly via two-point correlation function which shows presence checkerboard pattern vicinity undulation. nongated where...

SUMMARY A numerical method for the solution to density‐dependent incompressible Navier–Stokes equations modeling flow of N immiscible liquid phases with a free surface is proposed. It allows model an arbitrary number together additional vacuum phase separated surface. based on volume‐of‐fluid approach involving indicator functions (one per phase, identified by its density) that guarantees mass conservation within each phase. An function whole domain treat boundary conditions at interface...

Transcritical flows in free surface hydrodynamics emulate black hole horizons and their timereversed versions known as white fountains. Both analogue have been shown to emit Hawking radiation, the amplification of waves via scattering at horizon. Here we report on an experimental validation hydrodynamic laws that govern transcritical flows, for first time a water channel using space-time geometry controlled by bottom obstacle. A prospective study, both numerical, with second obstacle...

In this work three branches of Immersed Boundary Methods (IBM) are described and validated for incompressible aerodynamics fluid-structure interactions. These approaches are: Cut Cell method, Vortex-Penalization method Forcing method. The first two techniques external bluff-body flow around a circular obstacle. last one is used to predict the deformations an elastic membrane immersed in fluid. paper confirms ability family numerical schemes accurate robust simulation flows.

Accelerating/decelerating trans-critical flows (waterfalls/cataracts) are analogous to space-times of black holes/white fountains since the pioneering work Sch{\"u}tzhold \& Unruh in 2002. A single number is usually employed classify trans-criticality namely local depth Froude which ratio between current speed and celerity long gravity waves light celerity. When former reaches one, water no more able propagate upstream: hydraulic hole a river return for them. At higher level...

Abstract Injection of acid gases in fractured reservoirs will be one most challenging issue the future for many carbonate fields over world. A genuine integrated approach to characterize diffusion on a gas field has been developed including laboratory experiments, huff & puff pilots, experiments history match and up-scaling full-field dual-porosity model. First, pre-simulation have realized appreciate feasibility measurements between chamber (pseudo-fracture) core saturated by...

We present a cut-cell method for the simulation of 2D incompressible flows past obstacles. It consists in using MAC scheme on cartesian grids and imposing Dirchlet boundary conditions velocity field boundar... | Find, read cite all research you need Tech Science Press