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Expertise in Fluid Dynamics

Free surface flows

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Free surface flows represent an important area of numerical simulations. Special challenges include large density and viscosity ratio between the phases and cases where surface tension effects dominate. Careful choices of modelling approach - surface tracking with deforming mesh, or surface capturing (VOF) and expertise on numerics and setup guarantees quality solutions on a range of problems. In surface tracking techniques the mesh is adjusted to follow the motion of the free surface, allowing the surface effects to be captured in detail. Surface capturing techniques track the position of the free surface using a scalar variable and naturally follows the surface breakup events.

Turbulent flows, LES and acoustics

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Traditional Reynolds-averaged (RANS) approach to turbulence modelling, while adequate for a range of engineering flows does not always provide a satisfactory answer. Wikki provides expertise with a range of RANS models, including low-Re, non-linear k-epsilon and second order closure and their suitability for various modelling situations. Further increases in accuracy and extensions to aero-acoustic modelling are achieved through Large Eddy Simulation (LES), an area where knowledge and experience are an essential prerequisite for quality results. LES simulations are easily extended to provide data on aerodynamic noise sources, of particular interest in studies of passenger comfort in vehicles.

Environmental Modelling

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Environmental modelling has always been a source of interesting physical modelling, where the flexibility of OpenFOAM comes to the fore. To date, this includes a Finite Volume model of north polar ice dynamics, with and without coupling to the ocean-atmosphere model, shallow water equations in coastal engineering, a simplified atmospheric model etc.