Computational Fluid Dynamics (CFD), to which reference is often made by using english wording, is a computational method for studying the motion of a gas or of a liquid, or its effects, by the numerical resolution of the equations that govern its behavior, considering a mesh of the studied system.

The Finite Element Method (FEM) and the Boundary Element Method (BEM), to which reference is also often made by using english wording, are intended to numerically solve equations such as those associated with the propagation of sound in different environments when they are subdivided into subsets of smaller dimensions.

ITS has invested in an array of CFD, FEM and BEM software to refine the prediction of the acoustic and aerodynamic performance of silencers, especially when the complexity of their geometry requires modeling based on something else than analytical models with empirical adjustments, although these have proved useful in many cases, e.g. when it comes to the quick evaluation of the performance of a silencer with a conventional geometry.

The input data for such calculations are obviously the thermodynamic conditions of the fluid considered, the geometry of the object of the study, the properties of the materials if there are any.

The expected consequence of this investment is the capacity to complete the features of the software SILDIS (Module 1 prediction of acoustic and aerodynamic performance of silencers, Module 1A prediction of the acoustic and aerodynamic performance of silencers with discontinuous splitters, Module 1B prediction of acoustic and aerodynamic performance of reactive silencers) and to exceed its limits, for the prediction of output data such as transmission loss (usually referred to as TL), insertion loss (usually referred to as IL), noise reduction (usually referred to as NR) and total pressure loss (usually referred to as ΔP).

Such an array of tools is anticipated to be useful for studies in relation to air intakes of large fans, of large compressors and of gas turbines, to heat engines and combustion turbines exhaust, or to depressurization equipment, and, in general, in relation to many noise reduction devices (e.g. mufflers) for which a simulation of acoustic and / or aeraulic performance is necessary: either to predict their compliance with any reference, whatever (e.g. regulatory, contractual) or to evaluate (in advance) the efficiency of various soundproofing devices.

ITS will use the array of CFD, FEM, BEM software for acoustics and aerodynamics that has been acquired: either as part of Research & Development (R & D) projects or in the context of projects directly related to the needs expressed by Clients.