Hydrodynamic Instability
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Recent papers in Hydrodynamic Instability
This thesis deals with the dynamics of irreversible processes within the context of the general theory of relativity. In particular, we address the problem of the 'infinite' speed of propagation of thermal disturbances in a dissipative... more
The dynamics of a three-dimensional axisymmetric bluff-body wake are examined at low Reynolds regimes where transitions take place through spatio-temporal symmetry breaking. A linear stability analysis is employed to identify the critical... more
Turbulence is one of the most ubiquitous phenomena in all of fluid mechanics. In the ocean, no less than in the atmosphere, is its influence widespread. For example, the interplay between the ocean stratification and the diffusive... more
Finite-amplitude convective steady flows that do not bifurcate from the respective conduction state are discovered. They arise as the compensating horizontal gradients of two density-affecting components with equal diffusivities but... more
Hydro-geology (hydro- meaning water, and -geology meaning the study of the Earth) is the area of geology that deals with the distribution and movement of groundwater in the soil and rocks of the Earth's crust (commonly in aquifers). The... more
Transient laminar opposing mixed convection in a gravity driven downward flow confined inside a vertical rectangular channel has been investigated, with both walls suddenly subjected to symmetrical isothermal heat sources over a finite... more
The paper presents an experimental study of the capillary electrostatic instability occurring under effect of a constant electric field on a magnetic fluid individual peak. The peaks under study occur at disintegration of a magnetic fluid... more
This work is concerned with the investigation of fluid-mechanical behaviour and the performance of different subgrid-scale models for LES in the numerical prediction of a confined axisymmetrical bluff-body flow. Four subgrid-scale... more
The Correlates of War project scrupulously collects information about disputes between the countries over a long historical period together with other data relevant to the character and reasons of international conflicts. Using methods of... more
[1] This is a computational study of gravity-driven fingering instabilities in unsaturated porous media. The governing equations and corresponding numerical scheme are based on the work of Nieber et al. (2003) in which nonmonotonic... more
In a number of studies concerning the lateral heating of a vertical rectangular enclosure containing a stably stratified brine solution, diverse flow regimes have been observed for different values of the buoyancy ratio. In this Brief... more
A stable gradient of one density-affecting component having Dirichlet conditions at two horizontal boundaries of an infinite slot or a finite enclosure is considered in combination with an unstable gradient of another such a component... more
As has recently been reported by Tsitverblit and Kit [Phys. Fluids A 5, 1062 (1993)], a vertical rectangular enclosure containing stably stratified brine and differentially heated from its side walls is characterized by complex steady... more
Double-component instabilities and the resulting multiple equilibrium states arising in laterally heated stably stratified fluid systems are briefly reviewed from the perspective of the roles of unequal diffusivities and different... more
Onset of small-amplitude oscillatory and both small-and finite-amplitude steady double-component convection arising due to component different boundary conditions in an infinite slot is studied for various slot orientations to the... more
Compaction–dissolution waves in porosity and melt pressure form spontaneously in numerical simulations of melt migration in an upwelling, viscously compacting, porous column in a solubility gradient. The melt fraction is assumed to be... more
This paper presents the research methodology followed at the von Karman Institute (VKI) to study jet wiping. In this process, a strip is withdrawn from a bath of liquid and then wiped by impinging gas jets to control the final coating... more
We developed a numerical setup to simulate swirling jet flow undergoing vortex breakdown. Our simulation code CONCYL solves the compressible Navier-Stokes equations in cylindrical coordinates using high-order numerical schemes. A nozzle... more
The first subject treated in this thesis is bifurcation phenomena in laterally heated thermosolutal systems. They are considered in the context of explaining previous diverse-flow observations in such systems. The second subject is the... more
The steady axisymmetric Navier-Stokes equations for the flow in a cylindrical container and in an annulus have been solved by the continuation method, being a standard tool of numerical methods for bifurcation problems. By alteration of... more
We study the effects of zero-mean stochastic gravity modulation on the mixing characteristics of two miscible fluids initially separated by a thin diffusion layer. Both correlated and uncorrelated gravity modulation are considered and the... more
The article presents a liquid film instability model designed using results of the set of CFD simulations. The governing equations of the model are derived using a linear equation of motion. The stability analysis is carried out by... more