ISIS 2D Solvers
At the core of ISIS 2D are three integrated numerical solvers, used on projects throughout the world for various hydraulic and environmental studies: ADI (alternating direction implicit), TVD (total variation diminishing) and FAST.
These solvers have been developed to tackle different types of hydraulic conditions within urban environments, rivers, estuaries and floodplains.
The ISIS 2D solvers have been tested and independently benchmarked and shown to be robust and accurate for a wide range of applications and conditions. They are widely used by government organisations, consultants and research establishments.
ADI Solver
The ADI solver has been developed for fluvial, overland, estuarine and coastal modelling problems where the flow is not rapidly changing. It is quick, accurate and robust. The overland flow capability has been tested and proven to be best practice on studies such as the Tidal Thames Embayment carried out for the UK’s Environment Agency.
The ADI solver is based on the long-established depth integrated velocities and solute transport (DIVAST) numerical engine and over two decades of academic research.
TVD Solver
The TVD solver is a unique feature and has been developed to specifically provide accurate representation of two-dimensional ‘shocks’ (rapid changes in water surface profile). This solver allows complex hydraulics to be calculated more accurately; especially useful when considering dam breaks, breaches in defences or rapid flow around buildings. It provides increased stability as TVD solutions are less prone to numerical oscillations than other solvers.
FAST Solver
The FAST solver allows quick assessment of flooding using simplified hydraulics. It provides results up to 1,000 times quicker when compared to traditional two-dimensional solvers, providing results in seconds or minutes as apposed to hours or days.
ISIS FAST enables the rapid screening for many different types of flooding considerably reducing the cost of modelling. It is ideally suited to undertaking surface water flood mapping and risk assessments at local, regional, and national scales.
ISIS modules
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