SIMULIA Ressourcen-Center

Industry experts use MODSIM to streamline product design by breaking down silos, validating designs early, optimizing parts, and fostering better collaboration.

EBooks

The primary objective of the present study is to investigate the impact of the recirculating flow that develops inside a closed, hemi-anechoic test chamber on the noise generation mechanisms of a drone rotor operated under static thrust conditions. To that end, Lattice-Boltzmann simulations are conducted for both an idealized, semi-infinite free-field and a confined, hemianechoic domain that models the test chamber, with the latter validated against experimental measurements. Comparison between simulations reveals a significant increase in rotor noisedue to confinement, up to 5 dBA in overall sound pressure level depending on microphone location, with negligible impact on aerodynamic performance. Blade-strip and beam-forming source identification techniques are utilized to determine those sound-generation mechanisms responsible for the increase in rotor noise. Leading-edge interactions between the vortical structures convected by the recirculating flow and the rotor’s blades are demonstrated to be directly responsible for the generation of unsteady loads that lead to significantly higher bladepassing frequency harmonic peaks. A small enhancement of the high-frequency self-noise contribution is also observed, whereas blade-tip vortex dynamics are largely unaffected by confinement so that the contribution of blade-vortex interaction noise is negligible.

Tech Notes

This paper describes computational work ows for the evaluation of the acoustic environmental impact of vertical take-o and landing vehicles. An operational scenario of a vehicle undertaking an approach maneuver over a at terrain is considered. The aeroacoustic sources are predicted by using the high-fidelity CFD solver SIMULIA PowerFLOW based on the Lattice-Boltzmann/very-large-eddy-simulation method. An integral approach based on the Ffowcs-Williams and Hawkings analogy is used to compute the noise on a hemisphere centered around the vehicle. Finally, the on-ground noise footprint is computed by using the hemisphere noise extrapolation approach. In view of future trajectory/maneuver optimization studies, different trimmed trajectories are considered in order to show the effect of both the aero-mechanical setting of the vehicle and its instantaneous position on the perceived noise levels along a fly-over event. Trajectories are described by a time sequence of waypoints, vehicle pitch angle, tilt angles of the propulsion units and rotational speed of the rotors.

Tech Notes

The present work describes a numerical reproduction of the 22-in source diagnostic test fan rig of the NASA Glenn Research Center. Numerical flow simulations are performed for three different rotor/stator configurations and one rotational speed, representative of an approach operating condition, by using the lattice-Boltzmann solver PowerFLOW. The full stage and nacelle geometries are considered, and results are compared to available measurements. Tripping the rotor blades results in a slightly more accurate noise prediction as a consequence of amore accurate prediction of the velocity fluctuations in the rotor wake over the whole blade span. Fourier circumferential analyses are performed for an intake and a bypass duct section with the intent of explaining the origin of some tonal noise components and comparing the present results to available literature results. Finally, the effects of adding an acoustic treatment in the intake is shown by directly resolving the unsteady flowfield in a single-degree-offreedom honeycomb layer.

Tech Notes

The current paper describes a computational work ow for the prediction of the acoustic impact of vertical take-o and landing vehicles hovering over an crowded, urban area. The aeroacoustic sources are predicted by using the high-fidelity CFD solver SIMULIA PowerFLOW 6-2019 based on a Lattice-Boltzmann/Very-Large-Eddy-Simulation method. The acoustic propagation in quiescent air is extracted directly from the CFD simulation performed in a domain encompassing both the vehicle and the nearby urban city block. The effects of sound scattering due to the presence of several buildings is analyzed by comparing the noise levels on the surface of the buildings with levels extracted on the same surface from another solution performed without buildings. The potentiality of this technology in the optimization of a ight corridor is highlighted.

Tech Notes

This work describes an application of the Lattice-Boltzmann Method (LBM) software PowerFLOW R to the evaluation of the aerodynamic and aeroacoustic fields around helicopter rotors in strong Blade-Vortex Interaction (BVI) conditions.

Tech Notes

Manatee offers a collaborative simulation and analysis environment designed to quickly and accurately optimize vibro-acoustic performances of electrical systems under electromagnetic excitations. Its user-friendly interface has been developed for electrical, mechanical, acoustic and NVH test engineers.

Brochures

Module description of the Manatee V2.3 release

Brochures

Manatee offers default workflows to create multiphysics simulation that automatically combine the modelling levels that are the most adapted to the V-model development cycle stage of a given electrical system, from electrical machine basic design phase to system-level detailed design phase. Complementary to these standard workflows defined for electrical, mechanical & NVH engineers, Manatee also allows the creation of user-defined workflows.

Brochures

Manatee helps improve e-NVH performance of electrical systems throughout their development life cycle.

Brochures

How to ensure e-NVH requirements at system-level, when there is no access to e-machine parameters?

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Manatee can help electrical, mechanical and acoustics (NVH) engineers tackle key e-NVH challenges in electrical system design.

Brochures

The Structural and Durability Engineer role helps assess the structural integrity of any product with comprehensive structural simulations.

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Learn how fun error norms can be! Specifically the error norms used in the 3DEXPERIENCE Material Calibration App.

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The Simulation Model Build Engineer Role provides the detailed essential mesh and assembly modeling, to reduce non-value-added tasks, and build solver-ready finite element models timely and efficiently.

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New SIMULIA Training Products for specific industrial applications.

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The Composite Structures Performance Engineer role brings end-to-end composite layup designs, material modeling, cut section evaluation – to composite product mesh and assembly, and ultimately composite product performance – to meet or exceed your product minimum weight and high strength requirements.

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Simulation can help test devices like cell phones for electrostatic discharge (ESD) to prevent severe damage to electronic components.

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Battery development is of increasing importance as the world moves towards more green energy solutions. Simulation can help democratize the virtual testing and validation of batteries.

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The 2021 SIMULIA Champions come from multiple industries across the globe. We recently spoke with Andrea Giampieri from Tetra Pak in Italy to find out more about his engineering career and his passion for simulation.

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The Simulation Process Engineer role leverages simulation methods and provides access to key simulation tools.

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Get the latest enhancements for fe-safe.

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This blog post will demonstrate collaborative antenna design using the example of a 5G small cell antenna array.

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SIMULIA Champions come from around the world, and from a variety of industries. Here, we speak with David Scholtz of Wood Group in Australia to find out what led him into engineering and how his business is using simulation.

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