fluidyn - dB www.fluidyn.com SIMULATION INDUSTRIAL AND VEHICULAR NOISE PROPAGATION fluidyn-dB is designed to simulate the impact of noise pollution on the surrounding environment from noise sources such as existing or planned constructions, highways, factories etc. Simulation of noise propagation in presence of wind and humidity: Vehicular traffic : design and management of acoustic barriers ( buildings ...); Օ Industrial noise : external and internal sound management in buildings fluidyn-dB helps in predicting the noise levels due to single or multiple point sources or line type of noise sources. It can also be coupled with a back propagation acoustic model to model complex sources. fluidyn-dB takes into account the effect of terrain features such as flat or hilly regions and the effects of man-made and natural barriers on the propagation of noise. Buildings and vegetation also affect the propagation of noise and their effects are also modeled in fluidyn-dB. Ground absorption coefficients (due to grass, snow) as well as absorption due to coatings on barrier surfaces are available in fluidyn - dB. Meteorological conditions also play a significant role in noise propagation. fluidyn - dBtakes into account the effects of wind velocity and humidity on the noise propagation fluidyn - dBsolves the Helmholtz equation for wave propagation using the finite element method. Far-field results (at distances far away from the source) are obtained by a specific module fluidyn-dB-Ray, based on a ray emission technique coupled with an acoustic beam propagation method. This method helps to simulate sound propagation at any number of far-field points in a precise manner.

fluidyn-dB www.fluidyn.com fluidyn-dB is an integrated package comprising of a pre-processor, a solver and a post-processor. It is designed for use by city planners, environmentalists and industrials who may not have detailed knowledge of numerical methods. The entire process of simulation can be carried out by merely making appropriate choices out of a host of possible options offered by fluidyn - dB. fluidyn-dB is a fully menu-driven package with extensive context sensitive on-line help. METHODOLOGY 3D mixed formulation : - Near Field results by finite elements - Far field results by direct...