COMPUTER SIMULATION OF VEHICULAR NOISE & INDUSTRIAL 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. 

dB solves the Helmholtz equation for wave propagation using the finite element method. dB helps in predicting the noise levels due to single/multiple point or line types of noise sources. It 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 effect is accounted for in dB.
Meteorological conditions play a significant role in noise propagation. dB takes into account the effects of wind velocity and humidity on the noise propagation. Ground absorption (due to grass, snow) as well as absorbtion due to coatings on barrier surfaces are handled by dB.
Far-field results (at distances far away from the source) are obtained by series solutions and hence no extra computational effort is required to determine solutions at any number of far-field points.

dB is an integrated package comprising of a pre-processor, a solver and a post-processor. dB 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 the appropriate choices out of a host of possible options offered by dB. This can be done because dB is a fully menu-driven package with extensive context sensitive on-line help.

Applications:

Simulation of noise propagation in presence of wind and humidity :

• Vehicular traffic : design and management of acoustic barriers ( buildings ...);
  
• Industrial noise : external & internal sound management in buildings .