Scientific Report


Environmental Dispersion Processes


September18 – 27, 2006


The workshop Environmental Dispersion Processes focused on mathematical models and simulation strategies that are required for predicting the dominant transport mechanisms in the natural environment. This aim was supported by extensive discussion of experimental and field studies. Examples of important environmental transport processes may be found by considering turbulent mixing of (stratified) gases and liquids, of ensembles of small particles or of heat. Such dispersion processes are essential in various situations such as sediment-transport in rivers and coastal areas, spreading of pollutants, dust and soot in urban environments or the heat- and mass-transfer across the ocean-surface, with direct connections to weather and climate predictions.


The emphasis of the workshop was on a fundamental approach to this multi-disciplinary field of research. This requires input and integration from a variety of scientific and engineering disciplines. The many lively and interesting discussions and presentations certainly contributed to realizing this ambition. It helped to strengthen the Platform for Geophysical and Environmental Fluid-mechanics (PGEF) in the Netherlands. Topics from civil and mechanical engineering, mathematical and geophysical modeling, meteorology, hydrology and oceanography were addressed in the presentations.


The workshop provided a platform for the exchange of knowledge and ideas in the field of multiscale modeling and simulation of large-scale problems in environmental fluid mechanics.


FOM and the COST-Action `LES-AID’ supported the workshop financially. This allowed the invitation of a number of international experts who provided detailed presentations of their work. The chosen format of 1-hour presentations allowed in addition ample time for open discussion. During the first week of EDP around 40 people participated, while the final two days attracted around 25 people. Participants came from the Netherlands, Italy, Iran, the United Kingdom, USA, France, Switzerland, Poland and Germany.


The workshop had three focal areas:

·    Fundamentals of turbulent dispersion

·    Air quality monitoring and prediction

·    Transport in rivers, coastal regions and ocean circulation

Next to theoretical and simulation studies, a number of presentations were devoted to experimental and field-studies to help keep a direct connection with environmental aspects. Ample attention was given to the effects of ensembles of particles that are embedded in a flow. Consequences of preferential clustering of inertial particles and inelastic particle-particle interactions were discussed at length.


Bernard J. Geurts (University of Twente, Eindhoven University of Technology)