Broad band shock associated noise predictions in axisymmetric and asymmetric jets using an improved turbulence scale model

The work has been partly supported by Queen Mary Innovation Fund. The authors are grateful to The School of Engineering and Materials Sciences, Queen Mary University of London for the computational resources used for this research and for the travel funding provided for the conference. S.A. Karabasov acknowledges the support of the Royal Society of London and Engineering and Physical Sciences Research Council (EPSRC), project number EP/I017747/1

Similarity scaling of jet noise sources for low-order jet noise modelling based on the Goldstein generalised acoustic analogy

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors are grateful to the UK Government for supporting the SILOET program during which the model-scale data were acquired in the QinetiQ NTF and Dr Paul Strange (Rolls-Royce Plc) for facilitating access to these data. The work has been partially supported by the UK Engineering and Physical Sciences Research Council (EP/I017747/1) and partially by Aero Acoustics Research Consortium (AARC)

Aerofoil broadband and tonal noise modelling using stochastic sound sources and incorporated large scale fluctuations

The work has been supported by BAE Systems Ltd and the Engineering and Physical Sciences Research Council (EPSRC) (1357499). One of the authors is grateful to the Royal Society of London for their continuing support. Computations were performed on the QM cluster ‘Apocrita’. The authors are grateful to Dr Mark Allan for the initial introduction to the BAE Altus solver and fruitful discussions

Rheology of Water Flows Confined Between Multi-Layer Graphene Walls.

Water confined by hydrophilic materials shows unique transport properties compared to bulk water thereby offering new opportunities for development of nano-fluidic devices. Recent experimental and numerical studies showed that nano-confined water undergoes liquid-to-solid phase-like transitions depending on the degree of confinement. In the case of water confined by graphene layers, the Van der Waals forces are known to deform the graphene layers, whose bending leads to further non-uniform confinement effects. Despite the extensive studies of nano-confined water at equilibrium conditions, the interplay between the confinement and rheological water properties, such as viscosity, slip length and normal stress differences under shear flow conditions, is poorly understood. The current investigation uses a validated all-atom non-equilibrium molecular dynamics model to simultaneously analyse continuum transport and atomistic structure properties of water in a slit between two moving graphene walls under Couette flow conditions. A range of different slit widths and velocity strain rates are considered. It is shown that under the sub-nanometer confinement, water loses its rotational symmetry of a Newtonian fluid. In such conditions, water transforms into ice, where the atomistic structure is completely insensitive to the applied shear force and which behaves like a frozen slab sliding between the graphene walls. This leads to the shear viscosity increase, although not as dramatic as the normal force increase that contributes to the increased friction force reported in previous experimental studies. On the other end of the spectra, for flows at large velocity strain rates in moderate to large slits between the graphene walls, water is in the liquid state and reveals a shear thinning behavior. In this case, water exhibits a constant slip length on the wall, which is typical of liquids in the vicinity of hydrophobic surfaces

Hybrid multiscale simulation reveals focusing of a diffusing peptide molecule by parallel shear flow in water

The hybrid Molecular Dynamics - Fluctuating Hydrodynamics model is extended for multi-resolution simulations of molecular diffusion in water under a steady shear flow. Cases of water self-diffusion and a small protein diffusion in water are considered. For the switched-off flow effect, the model is validated in comparison with the reference all-atom equilibrium molecular dynamics solution. With the flow effect included, the multiscale model correctly captures the mean flow velocity distribution as well as the difference between mean square deviations in different directions with respect to the flow in accordance with the diffusion theory. Results of the simulations are analysed in the context of using hydrodynamic flow gradients for molecular diffusion focusing