NUMTECH software

NUMTECH employs the very latest Gaussian dispersion models, such as ADMS or AERMOD/ISC, to produce studies for a wide range of industrial sites, while factoring in particularly complex effects such as hilly terrain, mixed land use patterns, obstacles, local weather conditions, etc. For sites with a particularly complex configuration, our engineers bring even more sensitive 3-D tools into play, selected according to the scales involved: CFD FLUENT model (Eulerian approach) for dispersion studies involving near fields and complex environments, mid-scale models (RAMS, MM5, WRF), coupled with a Lagrangian model when the study requires an impact assessment over greater distances. Integral models (GASTAR) are used to factor in the dispersion of denser-than-air gases for some hazard studies.

NUMTECH uses specific software applications to model the dispersion of odours as part of its impact studies on composting activities, water treatment, animal waste disposal and petrochemicals. Based on flow quantification data and a representative meteorological time chart (generally covering several years), the models are used to map odour concentrations (UO/m3) throughout the facilities` surrounding environment, factoring in complex effects such as obstacles, multiple-point sources, near fields, turbulent fluctuation of odour levels, etc.

Using the latest cutting-edge modelling tools, NUMTECH coordinates end-to-end production of the « Air and Health » strands of road infrastructure impact studies in collaboration with the Centre d’Etudes de l’Impact de l’Environnement sur la Santé (C.E.I.E.S.) and specialist partners in the field of metrology. According to the recommendations of the interministerial circular dated February 2005, our partners take measurements using passive samplers and, where appropriate, mobile laboratories, in order to quantify initial air quality prior to conducting projects.

The team`s meteorologists work on missions for a broad customer base that includes industrials, research bodies and specialist design offices. These services are mainly based on the use of accurate 3-D models that reconstruct the meteorological fields making up the atmosphere, i.e. wind profiles, temperature inversions, stability, wind shear at altitude, etc.