The aerodynamic characteristics of an isolated MRH 90 helicopter fuselage have been investigated using Computational Fluid Dynamics (CFD). Simulations utilised an unstructured tetrahedral grid and both the k-ε and k-ω SST turbulence models were investigated. Standard ‘law of the wall’ wall functions were incorporated, along with a segregated finite volume solver. A wind tunnel testing program w...

For a family F⊆ωω we define the ideal I(F) on ω×ω to be generated by family{A⊆ω×ω:∃f∈F∀∞n(|{k:(n,k)∈A}|≤f(n))}. Using ideals of form I(F), show that structure Borel in-between two well known idealsED={A⊆ω×ω:∃m∀∞n(|{k:(n,k)∈A}|<m))} andFin⊗Fin={A⊆ω×ω:∀∞n(|{k:(n,k)∈A}|<ℵ0))} in Katětov order is fairly complicated. Namely, there copy P(ω)/Fin ED and Fin⊗Fin, consequently are increasing decreasing ...

In this work, we investigate the flow field around speed skating helmets and their associated aerodynamic drag by means of computational fluid dynamics (CFD) simulations. An existing helmet frequently used in competition was taken as a baseline. Six additional designs, well bare-head configuration, were analysed. All numerical simulations performed via 3D RANS using SST k-ω turbulence model. Th...

Based on the solid–liquid two-phase flow model, SST k-ω and Lagrangian equation model of particle motion, numerical simulations sediment–water in injector a large Pelton turbine were conducted. The distribution rules pressure, velocity, erosion rate, location obtained by analyzing characteristics sediment injector. results revealed that velocity trend water inside cylindrical jet exhibited nonl...

In this short note we apply the recently proposed data-driven RANS closure modelling framework of Schmelzer et al. (2020) to fully three-dimensional, high Reynolds number flows: namely wall-mounted cubes and cuboids at Re = 40 , 000 a cylinder 140 . For each flow, new is generated using sparse symbolic regression based on LES or DES reference data. This model implemented in CFD solver, subseque...

Due to a rapid increase in urbanisation, accurate wind microclimate assessment is of crucial importance. Evaluating flows around buildings part the planning application process design new developments. In this study, computational fluid dynamics (CFD) simulations are carried out for case representing East Village London Olympic Park. Following validation test against experimental data simpler u...