Software provides flow-induced noise simulation.

Press Release Summary:

LMS SYSNOISE Rev 5.6 uses results of Computational Fluid Dynamics (CFD) model to create aero-acoustic sources and predicts radiation and scattering of sound waves induced by fluids. It automatically performs Fast Fourier Transform on CFD time data, maps CFD data from CFD mesh on acoustic mesh, and generates required aero-acoustic sources. Applications include wind noise from vehicle side mirrors and sunroofs, and fan noise in ventilation systems, HVAC, home, and office equipment.

Original Press Release:

LMS Delivers Breakthrough Capabilities for Flow-induced Noise Simulation

Rev 5.6 of LMS SYSNOISE helps engineers to predict turbulence noise in the early design stage

Leuven, Belgium - June 18, 2003 - LMS International, the worldwide leader in Testing systems, CAE software and engineering services for functional performance engineering, today announced the availability of unique new capabilities in LMS SYSNOISE to simulate flow-induced noise and aero acoustic phenomena long before the physical prototype stage. LMS SYSNOISE uses the results of a Computational Fluid Dynamics (CFD) model to create aero-acoustic sources and predicts the radiation and scattering of sound waves induced by fluids. Typical applications include wind noise from vehicle side mirrors, and sunroofs, turbulence noise on a high-speed train or an aircraft landing gear, and fan noise in ventilation systems, HVAC, home and office equipment.

The new module in LMS SYSNOISE Rev 5.6 calculates flow-induced noise, using the results of Computational Fluid Dynamics (CFD) through a direct coupling with industry-standard codes such as CFX, Fluent and Star-CD. The simulation process starts with solving the flow equations using CFD models. Next, the CFD data are passed to SYSNOISE and post-processed to define sets of equivalent sources characterizing the aero-acoustics noise. Finally, SYSNOISE computes the radiated and/or scattered noise using its regular BEM (Boundary Element Method) or FEM (Finite Element Method) acoustic solvers, giving results at the surfaces and at any point in the field. The powerful post-processing capabilities of LMS SYSNOISE further deliver the necessary insights in the acoustic behavior of the design.

LMS SYSNOISE not only features a very efficient data transfer from the CFD database but also handles incompatibilities between the CFD and acoustic meshes. It automatically performs the Fast Fourier Transform on the CFD time data, maps the CFD data from the CFD mesh on the acoustic mesh, and finally generates the required aero-acoustic sources. These can be dipole-like, quadrupole-like or "rotating" dipole-like, enabling acoustic engineers to model and predict flow noise from stationary surfaces like mirrors, turbulence induced noise, as well as noise from rotating surfaces such as HVAC blowers and computer fans.

Application areas for aero-acoustic prediction include the automotive, aviation, space and naval industries; domestic appliances, white goods, consumer electronics and loudspeakers; construction, civil engineering and energy.

About LMS International

LMS enables customers to engineer functional performance targets into its products, creating and maintaining distinctive brand values. LMS' unmatched understanding of the product development process is captured through a unique combination of products and services supporting physical and virtual product development: Test systems, CAE software products and engineering services. Critical attributes such as noise and vibration, ride, handling, motion, acoustics and fatigue are turned from problems to competitive advantage. LMS, a Dassault Systèmes Gold Partner, is a global company with the vision, resources and commitment to significantly impact the product development performance of its customers.

United States:

Sarah Zajas

LMS North America

Tel 248 952 5664

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