Application of a maritime CFD code to a benchmark problem for non-Newtonian fluids: the flow around a sphere

The ship’s resistance and manoeuvrability in shallow waters can be adversely influenced by the presence of fluid mud layers on the seabed of ports and waterways. Fluid mud exhibits a complex non-Newtonian rheology that is often described using the Herschel–Bulkley model. The latter has been recently implemented in a maritime finite-volume CFD...

Wave Breaking Induced by Opposing Currents in Submerged Vegetation Canopies

Wave height attenuation in vegetation canopies is often all attributed to the drag force exerted by vegetation, whereas other potential dissipation process is often neglected. Previous studies without vegetation have found that opposing currents can induce wave breaking and greatly increase dissipation. It is not clear if similar process may...

Hydraulic modelling of liquid-solid fluidisation in drinking water treatment processes

In drinking water treatment plants, multiphase flows are a frequent phenomenon. Examples of such flows are pellet-softening and filter backwashing where liquid-solid fluidisation is applied. A better grasp of these fluidisation processes is needed to be able to determine optimal hydraulic states. In this research, models were developed, and...

Tree Sway Time Series of 7 Amazon Tree Species (July 2015–May 2016)

Measuring Tree Properties and Responses Using Low-Cost Accelerometers

Trees play a crucial role in the water, carbon and nitrogen cycle on local, regional and global scales. Understanding the exchange of momentum, heat, water, and CO 2 between trees and the atmosphere is important to assess the impact of drought, deforestation and climate change. Unfortunately, ground measurements of tree properties such as mass...

Drinking water pellet softening: prediction the terminal settling velocity of natural particles

Natural particles are frequently applied in drinking water treatment in up-flow fluidisation processes. Additionally, sedimentation processes are applied to clarify water and to concentrate solids. To estimate the terminal settling velocity of single solid particles in a liquid system, a comprehensive collection of equations is available. For...

Experimental research on hydrodynamic coefficients of sand-roughened, rigid, circular cylinders near a plane boundary in oscillating fluid

The hydrodynamic coefficients of a sand-roughened horizontal cylinder have been determined for various values of the relative roughness and relative gap height between the cylinder and the plane boundary. The Morison equation was used to describe the inline force signal. The transverse force was analysed with respect to the peak values during a...

Fifth and first order wave-force coefficients for cylindrical piles

Drag and mass coefficients corresponding to Stokes' fifth - order theory have been determined from previously published wave and wave - force data. Comparisons between statistical distributions for fifth-order and corresponding first order coefficients have been made for varying wave steepnesses. For other existing wave data, from which the...