Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

This thesis aims to contribute to a better understanding of turbulent open channel flow, sediment erosion and sediment transport. The thesis provides an analysis of high-fidelity data from direct numerical simulation of (i) open channel flow over an array of fixed spheres, (ii) open channel flow with mobile eroding spheres, (iii) open channel flow with sediment transport of many mobile spheres. An immersed boundary method is used to resolve the finite-size particles.

turbulence, open channel flow, sediment transport, sediment erosion, CFD

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

There is overwhelming evidence, from laboratory experiments, observations, and computational studies, that coherent structures can cause intermittent transport, dramatically enhancing transport. A proper description of this intermittent phenomenon, however, is extremely difficult, requiring a new non-perturbative theory, such as statistical description. Furthermore, multi-scale interactions are responsible for inevitably complex dynamics in strongly non-equilibrium systems, a proper understanding of which remains a main challenge in classical physics. As a remarkable consequence of multi-scale interaction, a quasi-equilibrium state (the so-called self-organisation) can however be maintained. This special issue aims to present different theories of statistical mechanics to understand this challenging multiscale problem in turbulence. The 14 contributions to this Special issue focus on the various aspects of intermittency, coherent structures, self-organisation, bifurcation and nonlocality. Given the ubiquity of turbulence, the contributions cover a broad range of systems covering laboratory fluids (channel flow, the Von Kármán flow), plasmas (magnetic fusion), laser cavity, wind turbine, air flow around a high-speed train, solar wind and industrial application.

pipe flow boundary layer --- turbulent transition --- large eddy simulation --- channel flow --- kinetic theory --- fluid dynamics --- turbulence --- self-organisation --- shear flows --- coherent structures --- turbulence --- stochastic processes --- Langevin equation --- Fokker-Planck equation --- information length --- trailing-edge flap --- control strategy --- floating wind turbine --- turbulence --- free vortex wake --- non-local theory --- Lévy noise --- Tsallis entropy --- fractional Fokker–Plank equation --- anomalous diffusion --- hybrid (U)RANS-LES --- IDDES methodology --- attached and separated flows --- complex dynamics --- microcavity laser --- spatiotemporal chaos --- turbulent boundary layer --- low speed streaks --- magnetic confinement fusion --- turbulence --- heat transport --- T-junction --- denoise --- coherent structure --- continuous wavelet transform --- solar wind --- scaling properties --- fractals --- chaos --- turbulence --- intermittency --- multifractal --- thermodynamics --- drop breakage --- drop coalescence --- local intermittency --- turbulent flow --- population balance equation --- high efficiency impeller --- Rushton turbine --- energy cascade --- bifurcations --- Lyapunov theory --- turbulence --- statistical mechanics --- intermittency --- coherent structure --- multi-scale problem --- self-organisation --- bifurcation --- non-locality --- scaling --- multifractal

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Non-Newtonian (non-linear) fluids are common in nature, for example, in mud and honey, but also in many chemical, biological, food, pharmaceutical, and personal care processing industries. This Special Issue of Fluids is dedicated to the recent advances in the mathematical and physical modeling of non-linear fluids with industrial applications, especially those concerned with CFD studies. These fluids include traditional non-Newtonian fluid models, electro- or magneto-rheological fluids, granular materials, slurries, drilling fluids, polymers, blood and other biofluids, mixtures of fluids and particles, etc.

inhomogeneous fluids --- non-newtonian fluids --- lubrication approximation (76A05, 76D08, 76A20) --- particle interaction --- viscoplastic fluid --- Bingham fluid --- computational fluid dynamics --- porous media --- convection --- Bingham fluid --- yield stress --- channel flow --- power-law fluid --- shear-dependent viscosity --- Reynolds equation --- lubrication approximation --- lid-driven cavity --- projection method --- shear-thinning --- aspect ratio --- Re numbers --- Brinkman equation --- viscosity ratio --- first- and second-order slip --- similarity transformation --- porous medium --- generalised simplified PTT --- Phan-Thien–Tanner (PTT) model --- Mittag–Leffler --- Couette flow --- Poiseuille–Couette flow --- non-isothermal flows --- creeping flows --- viscous fluid --- optimal control --- boundary control --- pressure boundary conditions --- weak solution --- existence theorem --- marginal function --- hemoglobin --- biological capacitor --- non-equilibrium thermodynamics --- hemoglobe capacitor --- thermodynamic capacitor --- smoothed particle hydrodynamics (SPH) --- meshless --- fluid-solid interaction (FSI) --- membrane --- rupture --- SPH-FEM --- stokesian dynamics --- dense suspension --- rheology --- bubble suspension --- suspension viscosity --- Gamma densitometer --- high viscosity oil --- slug translational velocity --- closure relationship --- wormlike micellar solutions (WMS) --- enhanced oil recovery (EOR) --- chemical EOR (cEOR) --- viscoelastic surfactants (VES) --- non-linear fluids --- variable viscosity --- natural convection --- convection-diffusion --- buoyancy force --- lubrication --- suspensions --- viscoplastic fluids --- cement --- biofluids --- oil recovery --- porous media