Abstract The canonical configuration of a solid particle bouncing on wall in viscous fluid is considered here, focusing rough particles as encountered most the laboratory experiments or applications. In that case, deformation not expected to be significant prior contact. An immersed boundary method (IBM) allowing flow around numerically described combined with discrete element (DEM) order investigate dynamics system. Particular attention paid modelling lubrication force added method, which...

Large gas bubbles rising under the effect of buoyancy are known to adopt either a spherical cap shape or undergo topological transition after which they become toroidal. We carry out an axisymmetric numerical investigation evolution such large in presence both capillary and viscous effects. The approach is volume fluid type (it solves Navier-Stokes equations on fixed grid transports local fraction one fluids), but does not involve any explicit reconstruction interface. from toroidal studied...

Using laboratory experiments, the collapse of a liquid-saturated granular column in air on horizontal plane is analyzed light ``column'' Bond number, grain diameter to capillary length ratio, initial aspect Stokes and volume fraction.

We report on the results of a numerical study nearly immiscible contrasted density currents aimed at shedding light influence wall effects current dynamics in lock-exchange configuration. The approach is an interface-capturing method which does not involve any explicit reconstruction interface. Navier–Stokes equations are solved fixed grid and hyperbolic equation used for transport local volume fraction one fluids. This allows us to describe complete range contrast 10 −3 ≤ρ L /ρ H ≤0.99 (ρ ρ...

Abstract The present analysis shows that the most crucial parameter for a correct representation of observed temperature behavior are heat exchange coefficient and wind. different approaches tested all have limitations, but they can reproduce reservoir trends at depths with maximum standard deviation ranging from 3 °C to 8 °C.

The time-dependent behaviour of non-Boussinesq high-Reynolds-number density currents, released from a lock height h 0 and length x into deep ambient spreading over horizontal flat boundaries, is considered. We use two-dimensional Navier–Stokes simulations to cover: (i) wide range current-to-ambient ratios, (ii) length-to-height aspect ratios the initial release within (termed ratio λ = / ) (iii) different phases spreading, acceleration phase self-similar regimes. results are compared with...

Experiments on the collapse of non-colloidal and neutrally buoyant particles suspended in a Newtonian fluid column are presented, which initial volume fraction suspension $\unicode[STIX]{x1D719}$ , viscosity interstitial $\unicode[STIX]{x1D707}_{f}$ diameter $d$ mixing protocol, i.e. preparation suspension, varied. The temporal evolution slumping current highlights two main regimes: (i) an inertial-dominated regime followed by (ii) viscous-dominated regime. inertial is characterized...

The present work reports some new aspects of non-axisymmetric gravity currents obtained from laboratory experiments, fully resolved simulations and box models. Following the earlier Zgheib et al. ( Theor. Comput. Fluid Dyn. , vol. 28, 2014, pp. 521–529) which demonstrated that initiating cross-sectional geometries do not become axisymmetric, nor they retain their initial shape during slumping inertial phases spreading, we show such eventually reach a self-similar regime (i) local front...

Abstract Direct numerical simulations of a turbulent boundary layer flow over bed hemispheres height h are performed using an immersed method for comparison with river biofilm growth experiments in hydraulic flume. Flow statistics above the substrates shown to be agreement measurements by laser Doppler velocimetry and particle image experiments. Numerical give access components inside roughness sublayer, colonization patterns found associated low shear stress regions on hemisphere surface....

The dynamics of non-axisymmetric turbidity currents is considered here for a range Reynolds numbers O (104) when based on the initial height release. study comprises series experiments and highly resolved simulations which finite volume particle-laden solution released into fresh water. A mixture water polystyrene particles mean diameter d̃p=300μm density ρ̃c=1012kg/m3 initially confined in hollow cylinder at centre large tank filled with Cylinders two different cross-sectional shapes, but...

The present work aims at reproducing the local dynamics of a dense granular media evolving in viscous fluid from grain scale to that thousands grains, encountered environmental multiphase flows. To this end soft-sphere collision/immersed-boundary method is developed. methods are validated alone through various standard configurations including static and dynamical situations. Then, simulations binary wall-particle collisions performed for wide range Stokes number ranging [10 −1 , 10 4 ]....

We compute the flow induced by steady translation of a rigid sphere along axis large cylindrical container filled with low-viscosity fluid set in rigid-body rotation, being constrained to spin at same rate as undisturbed fluid. The parameter range covered simulations is similar that explored experimentally Maxworthy [\textit{J. Fluid Mech.}, vol. 40, pp. 453-479 (1970)]. describe salient features flow, especially internal characteristics Taylor columns form ahead and behind body inertial...

SUMMARY We investigate numerically some thermomechanical conditions for the development of crustal scale diapirism and convection in a heterogeneous continental crust independently from action regional tectonics. Here, we consider hot crust, with unmolten partially molten domains specific temperature strain-rate dependent power-law rheologies. take advantage volume fluid (VOF) method to capture coalescence separation deformable inclusions domain. The inclusions, several hundred metres size,...

The flow of a gravity current finite volume and density $\unicode[STIX]{x1D70C}_{1}$ released from rest rectangular lock (of height $h_{0}$ ) into an ambient fluid $\unicode[STIX]{x1D70C}_{0}$ ( ${<}\unicode[STIX]{x1D70C}_{1}$ in system rotating with $\unicode[STIX]{x1D6FA}$ about the vertical $z$ is investigated by means fully resolved direct numerical simulations (DNS) theoretical model (based on shallow-water Ekman layer spin-up theories, including mixing). motion dense includes...