Ansys Acoustics’ Post

ACROSS ACOUSTICS Listen to the first part of the latest round of POMA Student Paper Competition winners talk about their research in ship noise, underwater micronavigation, and rotorcraft noise. https://lnkd.in/gXeyisBK (Soundbite transcript: "So when you have a helicopter rotor, the broadband noise frequencies are several 1000 Hertz, because these are the high frequencies of turbulence. But the blade passage frequency is going to be a lot less, on the order of, let's say, tens of Hertz, and that's really what you're hearing when you hear a helicopter chop or buzz. Your brain can't make out 5000 cycles per second, but it really locks onto the 10 cycles per second. So time-varying broadband noise is important for human perception of sound. But that being said, most aircraft noise research doesn't typically consider the time variation of broadband noise, so that's what my research wants to address.") CRASH-UdeS Penn State College of Engineering

According to the Oxford English Dictionary, Acoustics is the branch of physics concerned with the properties of sound, and aeroacoustics is a subcategory. However, while aeroacoustics definitely falls under that umbrella, it also encompasses aerodynamics, which contributes to the conditions that cause the sound; and therefore, it gets a little complicated. If you want to know more, click on the link, and don't forget to follow @GRAS Sound and Vibration, our affiliated page dedicated to the automotive industry. Read more: https://lnkd.in/exMZQmBX

This paper proposes an arrangement that partitions the channel training stage into several phases, where the #reconfigurable #intelligent #surfaces (#RISs) reflection coefficients are pre-designed and the effective superposed channel is estimated instead of separately training the source-destination and source-RIS-destination links. Based on this, the active beamformer can be designed at low complexity and the RIS reflection optimization is performed by selecting that one from the pre-designed training set which maximizes the achievable rate. Secondly, the authors propose novel techniques for generating the training set of RIS reflection coefficients. The theoretical performance of the proposed scheme is analyzed and compared to the optimal RIS configuration. ----Jiancheng An, Lajos Hanzo More details can be found at this link: https://lnkd.in/gUZGUFdy

🔬Delve into our recent research on the Aeroacoustic Performance of the DJI-9450 Propeller! This cutting-edge study serves as an essential benchmark for those working in the turbomachinery sector. 🚁 Our comprehensive report takes a deep-dive into the acoustics, aerodynamics, and performance characteristics of this popular propeller, offering significant insights for industry professionals and researchers alike. 👩🔬 📊 We've made the case study available for download, ensuring easy access to valuable data and findings. Go ahead and immerse yourself in our meticulously analyzed and compiled research. 📚💡 Access the summary here: https://lnkd.in/es-7M_Xw For a full exploration of the study, follow this link: https://lnkd.in/ekzBJEMS Stay tuned for more updates and do share if you find our research useful! #AeroacousticResearch #PropellerBenchmark #Turbomachinery 💼🌐🔍

Dive into the world of aerodynamics with 𝐋𝐨𝐫𝐞𝐧𝐳𝐨 𝐃’𝐀𝐧𝐚𝐬𝐭𝐚𝐬𝐢𝐨's groundbreaking thesis: "𝘖𝘱𝘵𝘪𝘮𝘪𝘻𝘢𝘵𝘪𝘰𝘯 𝘰𝘧 𝘵𝘩𝘦 𝘈𝘦𝘳𝘰𝘥𝘺𝘯𝘢𝘮𝘪𝘤𝘴 𝘰𝘧 𝘢 𝘙𝘦𝘢𝘳 𝘊𝘢𝘮𝘦𝘳𝘢 𝘵𝘩𝘳𝘰𝘶𝘨𝘩 𝘊𝘍𝘋 𝘈𝘯𝘢𝘭𝘺𝘴𝘪𝘴 𝘢𝘯𝘥 𝘔𝘦𝘴𝘩 𝘔𝘰𝘳𝘱𝘩𝘪𝘯𝘨," another example of our strong link to research and academia. The thesis was carried out as part of a collaboration between University of Rome Tor Vergata, ENGYS, Volvo Group and RBF Morph. Lorenzo's work delves deep into Computational Fluid Dynamics (CFD) analysis, utilizing multiple solvers to dissect the intricacies of aerodynamics. Starting with a simplified car model (ASMO), he delves into optimization techniques before transitioning to a real industrial case study: 𝐭𝐡𝐞 𝐚𝐞𝐫𝐨𝐝𝐲𝐧𝐚𝐦𝐢𝐜 𝐬𝐭𝐮𝐝𝐲 𝐚𝐧𝐝 𝐨𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 𝐨𝐟 𝐚 𝐫𝐞𝐚𝐫 𝐜𝐚𝐦𝐞𝐫𝐚. But that's not all! Lorenzo's thesis isn't just about crunching numbers. He also tackles 𝐬𝐢𝐠𝐧𝐢𝐟𝐢𝐜𝐚𝐧𝐭 𝐠𝐞𝐨𝐦𝐞𝐭𝐫𝐢𝐜 𝐦𝐚𝐧𝐢𝐩𝐮𝐥𝐚𝐭𝐢𝐨𝐧𝐬, 𝐬𝐞𝐚𝐦𝐥𝐞𝐬𝐬𝐥𝐲 𝐜𝐨𝐧𝐧𝐞𝐜𝐭𝐢𝐧𝐠 𝐭𝐡𝐞 𝐫𝐨𝐨𝐟 𝐰𝐢𝐭𝐡 𝐭𝐡𝐞 𝐀𝐞𝐫𝐨𝐒𝐔𝐕 𝐦𝐨𝐝𝐞𝐥 𝐭𝐨 𝐞𝐧𝐡𝐚𝐧𝐜𝐞 𝐨𝐯𝐞𝐫𝐚𝐥𝐥 𝐚𝐞𝐫𝐨𝐝𝐲𝐧𝐚𝐦𝐢𝐜 𝐞𝐟𝐟𝐢𝐜𝐢𝐞𝐧𝐜𝐲. Join us in celebrating Lorenzo's dedication to pushing the boundaries of aerodynamic engineering! You can read the presentation here: https://lnkd.in/dNX9KDRV #simulation #rbf #rbfmorph #automotive #ShapeOptimization #cfd #engineering #innovation #aerodynamics Marco Evangelos Biancolini Emiliano Costa Torbjörn Virdung

Its out ! Our last paper on the aerodynamics of flapping wings has been published in Physics of Fluids: https://lnkd.in/eGMwfPDy Brilliant work by Romain Poletti and Andre Calado at the von Karman Institute for Fluid Dynamics, with invaluable support from Lilla Kapa and Joris Degroote from Ghent University. 🔍 This work dives deep into the unsteady aerodynamics of flapping wings in hovering flight, exploring the complex interactions of leading-edge vortices (LEV), rotational circulation, and wing-wake interactions. We employed an advanced combination of CFD tools (LES, Overset methods, potential flow simulations) and post-processing techniques (Extended POD, finite-time Lyapunov exponent) to unravel the mechanisms of lift generation in both “smooth” and “aggressive” flapping. #CFD, #Aerodynamics, #FlappingWings, #PhysicsOfFluids, #UnsteadyAerodynamics, #Research

My coauthors, Stanislav Gordeyev, Matthew Kemnetz, and Mark Spencer, and I are happy to announce that we recently published a two-part tutorial on aero-optical effects in Optica’s Journal of the Optical Society of America A (JOSA A). Aero-optical effects refers to laser beam disturbances caused by the environment in proximity of an aircraft. In part I, we provide introductory material with an emphasis on system-level considerations, particularly for those who are new to the field of aero-optics. In part II, we move on to survey several sources of aberrations. For example, we cover foundational sources like boundary layers and shear layers, as well as miscellaneous sources like mechanical contamination, shock waves, and aero acoustics. This two-part tutorial also differs from previous efforts in that it (1) includes very detailed explanations on both the aerodynamic and optical effects, specifically for new researchers trying to investigate this field; (2) discusses recent results related to aero-optical effects at supersonic and hypersonic speeds, in addition to subsonic speeds; and (3) introduces the aero-optical effects associated with shock waves, mechanical contamination, and aero-acoustics, which all lead to aberrations that degrade performance at the system level. As such, (1)–(3) will inform future efforts looking to implement laser systems on airborne platforms. For those interested in reading part I and II of this tutorial, they are openly available online and can be found through the following links: https://lnkd.in/gHT6zxMu https://lnkd.in/grhbepP4

Tomorrow, we'll be happy to introduce a new Axial Fan Acoustic Benchmark. In this project, we deal with the engineering simulation of Computational Aero-Acoustics (CAA), focusing on the Axial Fans. Employing advanced techniques like resolved CFD simulation together with the Acoustic Analogy and Ffowcs Williams-Hawkings, we explore the transient simulation with Finite Volume CFD simulations in a cell-centered framework. The mesh generation utilizes SnappyHexMesh with inflation layers powered by OpenFOAM and within the TCAE environment. Our study employs the k ω SST-DES model. We assess the Sound Pressure Level (SPL), Power Spectral Density (PSD), present Polar plots, and backward sound reconstruction. This comprehensive analysis sheds light on the fascinating world of CAA and its applications in aerodynamics.

This week #EQUA_Tunnel is engaging in the proceedings at the 20th International Symposium on Aerodynamics, Ventilation and Fire Safety in Tunnels, which is held in Copenhagen, Denmark. Here our main #IDA_Tunnel developer Omid Abouali on stage, contributing to the scientific discussion with an analysis of the drag coefficient of a train moving through a tunnel. #Tunnel_simulation, #ISAVFT_2024

🚀 Excited to share that my latest research has been published in the Journal of Fluids and Structures! Check out the article here: [https://lnkd.in/dSunvbau] In this study, we delved into the intricacies of aerodynamics by conducting numerical simulations of the flapping motion of a rectangular wing in a three-dimensional flow field, utilizing the discrete vortex method (DVM). The beauty of DVM lies in its computational efficiency, eliminating the need for grid generation at each time step, unlike conventional methods. But here's where it gets exciting - we didn't just stop at the rigid wing case. We explored the dynamic world of deformable wings, investigating various configurations like bending, twisting, and the intriguing bending-twisting coupling (BTC). Our novel aerodynamic technique in wing twisting, revolving around a dynamically adjusted point at the root of the leading edge, proved remarkably effective in enhancing aerodynamic force. A huge shoutout to my supervisors Devranjan Samanta and Dr. Srikant Sekhar Padhee Sir for their invaluable guidance throughout this journey. Together, we're pushing the boundaries of aerodynamics, one flap at a time! 🌟 #Aerodynamics #Research #Innovation #FlappingWings