Modelling Extreme Flow Events: Flash flooding
Many problems in environmental sciences such as tsunamis, storm surges and
dam-breaks involve the large-scale movement of solids and fluids. They are often
irregular in their timing, difficult to observe and measure, involve multiple
types of physical processes on a broad range of spatial and temporal scales and
can be catastrophic in their consequences.
Computational modelling can play an important role both in helping to
understand the nature of the fundamental processes involved, and in predicting
the detailed outcomes of various types of events in specific locations.
Particle-based modelling methods have specific advantages over traditional grid
or mesh-based continuum methods for these types of problems. These include
highly accurate and non-diffusive prediction of complex free-surface behaviour
including wave motion, fragmentation and splashing; accurate and automatic
convection of material; and the straightforward inclusion of multiscale
multi-physics.
The CFD group in CMIS has been developing the particle based Smoothed
Particle Hydrodynamics (SPH) code and the Granular Flow (GF) code to model
geophysical flows using real three-dimensional topography obtained from Digital
Terrain Models (DTM). Due to the use of real topographic information the results
from the SPH model can be directly compared with disaster scenarios.
The following are movies of Geophysical SPH/GF simulations modelled by the CFD group:
Note:
Some movies are
DivX encoded to reduce file size.
If
you have any problems playing these videos - you
should ensure that you have
the latest codecs installed by visiting the DivX
website and downloading the codecs.
http://www.divx.com/divx/
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