Restoring gradual land-water transitions in a shallow lake improved phytoplankton quantity and quality with cascading ef...
status: published
Hybrid RANS/LES simulations of secondary flows in a linear cascade of turbine blades with external turbulence
Turbine blades are highly aerodynamically loaded, which leads to secondary flows in the vicinity of the hub/shroud walls. These secondary flows are the cause of significant aerodynamic losses in the turbine row, that need to be accurately predicted by the design engineer. Also, turbine rows operate in a flow with a high intensity of free-stream tur...
RANS prediction of the aerodynamic losses in a linear turbine cascade with an upstream cavity and a purge flow
In a turbomachine, gaps separate stator and rotor disks. For turbines, often a purge flow is blown through these gaps in order to seal and avoid hot air to penetrate deep in the turbine disk components and over-solicit them. The interaction of this purge flow with the main flow creates and amplifies vortex structures, responsible for aerodynamic lo...
Extension of the Spectral Difference Method to Premixed Laminar and Turbulent Combustion
A Spectral Difference (SD) algorithm on tensor-product elements which solves the reacting compressible Navier-Stokes equations is presented. The classical SD algorithm is shown to be unstable when a multi-species gas where thermodynamic properties depend on temperature and species mass fractions is considered. It is demonstrated that computing prim...
On the Seed Population of Solar Energetic Particles in the Inner Heliosphere
status: published
Aerodynamic characterisation of porous fairings: pressure drop and Laser Doppler Velocimetry measurements
Published in Scientific Data
Wind tunnel measurements of pressure drop and steady and unsteady velocity field of a flow through fairing samples are described. 10 samples have been tested in pressure drop among which the velocity fields of 3 samples have been characterized by means of laser Doppler velocimetry. The samples are perforated plates, wiremesh plates or complex 3D ge...
On the statistics of coherent vortices in incoherent environments
Coherent vortices are important building blocks of complex flows on all scales, governing dynamics in various applications from geophysics over engineering to the coherent-structures’ paradigm of turbulence. As a commonly studied prototype of this configuration, we consider a large-scale, line vortex evolving in a background flow of small-scale, in...
Flame ignition and extinction modelling using infinitely fast chemistry in large eddy simulations of fire-related reacti...
Large eddy simulations with the use of infinitely fast chemistry, focusing on flame ignition and extinction modelling, are presented within the context of fires. A dynamic approach with respect to turbulence, combustion and radiation modelling is employed in the simulations. Flame ignition is modelled based on an ignition temperature, which varies ...
Impact of Disc Wheel Geometry on Aerodynamic Performance: A Computational Fluid Dynamics Investigation
status: published
Spontaneous formation of a transport barrier in helium plasma in a tokamak with circular configuration
We report on the first experimental observation of a spontaneously formed transport barrier in the tokamak with a circular configuration in helium plasmas. There was no external polarization of the plasma by electric field or other technique to form the barrier as it is typically used in tokamaks with circular plasma. In general, the transport barr...
