Dzmitry Shakhrai’s Post

🔊 Open for submission to the Special Issue: Progress in #Computational and #AppliedMechanics 🎓 GEs: Dr. Bingbing Xu and Dr. Jian Meng 🧭 Deadline: 25 March 2025 📌 Link: https://buff.ly/4e1VRoE 🍀 Topics of interest include, but are not limited to, the following: ▪️ Computational methods: including finite element method, meshless method, virtual element method, and particle methods; ▪️Mechanics of materials: plasticity, damage, phase field fracture; ▪️Dynamics, vibrations, and waves in solids; ▪️Multiscale and multiphysics simulations; ▪️High-performance computing techniques; ▪️Uncertainty quantification and sensitivity analysis; ▪️Computational fluid dynamics: compressible flow, incompressible flow, numerical heat transfer. #MDPIOpenAccess #ComSciMath_Mdpi

I'm very happy to announce 📢 that the first paper 📃 based on my PhD research has been submitted to #physicsoffluids! The preprint can be found on arXiv at https://lnkd.in/emN-STB6. In this study we investigated the effects of varying #sweepangle and plunge rate on the #vortexdynamics of wings using high fidelity #IDDES #CFD. Key findings: ● The leading-edge suction parameter #LESP concept is applied to 3D wings and verified against qualitative flow field visualisations ● The force partitioning method #FPM is used to investigate the spanwise lift distribution resulting from the leading-edge vortex ● The impulse-like acceleration at high reduced frequency causes the #LEV to detach from the leading edge and convect faster downstream, significantly affecting lift generated by the wing ● As reduced frequency increases, the method of LEV breakdown switches from vortex bursting to LEV leg-induced instabilities

In engineering and applied sciences, understanding the dynamics of systems with discontinuities, such as self-excited or stick-slip vibrations caused by dry friction, is essential. These vibrations are part of everyday experiences, from squeaking chalk on a blackboard and violin string vibrations to disc brake squeal and drill-string motions. Our recent study, "Hidden Dynamics of a Self-Excited SD Oscillator", has been published in the Journal of Nonlinear Dynamics. This research investigates the complex behaviour of a self-excited smooth and discontinuous (SD) oscillator with geometric nonlinearity. Such systems are relevant in various fields, including brake systems, tectonic plate movements, and the stick-slip phenomena of the Whillans Ice Stream. Utilizing the hidden dynamics framework, we address a critical gap in Filippov's theory of dry friction oscillators, particularly when the static friction coefficient exceeds the kinetic coefficient. We identified intriguing bifurcation phenomena, including a novel behaviour involving the collision and merging of degenerate boundaries and the bifurcation of a sliding homoclinic orbit to a saddle. The oscillator's response to harmonic excitation also revealed dynamic behaviours such as stick-slip and pure slip limit cycles and chaotic solutions emerging through period-doubling bifurcations. Sincere thanks to my guide, Dr. Ganesh Tamadapu, for his invaluable support and guidance throughout this research. Read more about our work in our latest publication: https://lnkd.in/d7xbGwBD

🎉 We are excited to announce that our recent paper titled "Vortex-Induced Noise Suppression of a Cylinder with Blowing Through Porous Media" has been published in Physics of Fluids! 🎉 🔍 In this study, we explored a hybrid method by applying local air blowing through a porous coating to suppress vortex-induced noise around a circular cylinder. 📊 We employed near-field pressure measurements via remote sensing, far-field noise analysis, and planar PIV to evaluate the performance of this method compared to purely porous coatings and local blowing used individually. 🏆 We are honored that this paper has been selected as one of the journal's best and promoted as a Featured Article by the Editors' Choice. Our paper is now prominently displayed on the journal's homepage with an (F) icon next to the title. 🚀 Check out the article (https://lnkd.in/gpQzJyk2) to learn more about our groundbreaking findings and their implications! 🌐 #Research #PhysicsOfFluids #VortexInducedNoise #NoiseSuppression #PorousMedia #FluidDynamics #Engineering #Innovation #FeaturedArticle #PIV #RemoteSensing #FarFieldNoise #Aerodynamics #Aeroacoustics #CircularCylinders

❗Twisting a soft tube, such as a hose, causes it to buckle and lose functionality. Preventing this buckling has been challenging for soft systems so far. 💡In our latest research in Nature Communications, we introduce cylindrical meta-shells that uniformly squeeze when twisted and become more stable instead of buckling. We also highlight meta-shells' applications as twist-driven compressors. Discover how our research is giving a twist to the design of metamaterials. 👉 Article: https://lnkd.in/e2qXR863 👉 Behind the Paper: https://lnkd.in/eUq64duA 🙏 Thanks to all my coauthors for their valuable contribution to making this exciting research happen Mehdi Habibi, Mohammad J. Mirzaali, Tobias Roebroek, Corentin Coulais, Daniel Bonn, Erik Van Der Linden, and to my research group, Physics and Physical Chemistry of Foods - Wageningen University and Research ❓ What are your thoughts on the future of such metamaterials?

I am excited to share my recent work published in Physical Review E. I'm incredibly thankful to Dr. Koushik Viswanathan for his frictionless flow of ideas and for applying the right 'push' to keep me constantly moving forward. And a big shoutout to my lab mates for creating a culture of sharp feedback and constructive critique—couldn't have done it without you all! For those interested, you can check out the full article here: https://lnkd.in/guKN8J5v A summary of this work is presented below: It is common experience that a solid, when pushed along a surface, begins to slide only after the application of a minimum force, termed the static friction force. While this simple picture relates to everyday observations – think books sliding off inclined desks – the question of how sliding starts at the contact interface is still the subject of much scientific curiosity. Besides being of fundamental interest, a solution to this problem can also serve more practical purposes, such as the potential early detection of earthquakes. In this work, we show that sliding motion at an interface is initiated microscopically by one of three types of waves – two slow moving and one rapid. We use a discrete mathematical model to show that these three waves are produced under three different types of loading, all with the same overall effect. If the solid is pushed or pulled, slow moving interface waves occur. On the other hand, if the solid is sheared, significant strain energy build-up occurs, and a rapid front traverses the interface. Other interesting analogies also emerge, such as the fascinating one between sliding friction and interface fracture. #Lamfip #IISc

Thrilled to share our latest findings on erosion problems using Computational Fluid Dynamics (CFD) and Lagrangian particle tracking in OpenFOAM. 🔬 New results highlight the profound impact of the boundary layer on the dispersed phase in Eulerian-Lagrangian problems. Navigating the intricacies of this coupling-laden dynamics, we're on a mission to quantify and compare coupling forces. Our ultimate goal is to simplify the problem for enhanced understanding and efficiency. #CFD #OpenFOAM #FluidDynamics #ErosionSimulation #LagrangianTracking #Research #Engineering #Simulation #Innovation #Science #BoundaryLayer #Dynamics #CouplingForces #Quantification #SimplifyTheProblem #Advancements #LinkedInPost #NewDiscoveries #finiteelementanalysis #finiteelementmethod

📢 Excited to announce that my latest research paper titled "Wave dispersion in a damped beam supported by cubic nonlinear springs: A multiscale freewave approach" has been published in Physical Review E! This paper explores wave dispersion in nonlinear systems, where the amplitude-dependent tunability of the band gap creates exciting opportunities. We investigate how continuous beam structures, periodically supported by nonlinear springs, behave and how inherent beam damping influences wave dispersion. Through an analytical framework using homogenization and the method of multiple scales, we derived the wave dispersion equation and validated it with numerical simulations. Our findings show that the frequency shift is positive for hardening supports and negative for softening ones. Additionally, we examined the time-dependent shift in damped systems, considering both viscous and strain rate-dependent damping. Over time, the frequency shift diminishes as the amplitude decreases, reducing the effects of nonlinearity. This study opens new possibilities for controlling or filtering vibrations through the tunable band gap of continuous nonlinear metamaterials. Feel free to check out the full paper here https://lnkd.in/eJuZvBxQ, and I'd love to discuss further if this aligns with your interests! #Research #WaveDispersion #NonlinearDynamics #Metamaterials #PhysicalReviewE #VibrationControl #MultiscaleModeling

Numerical modeling of 𝐛𝐮𝐛𝐛𝐥𝐞 𝐝𝐲𝐧𝐚𝐦𝐢𝐜𝐬 𝐧𝐞𝐚𝐫 𝐚 𝐬𝐮𝐫𝐟𝐚𝐜𝐞 𝐨𝐟 𝐮𝐫𝐢𝐧𝐚𝐫𝐲 𝐬𝐭𝐨𝐧𝐞 using the open-source software ECOGEN for multiphase, compressible, multiphysics flows. 🔗 Link to the related scientific publication «𝘏𝘪𝘨𝘩-𝘴𝘱𝘦𝘦𝘥 𝘷𝘪𝘥𝘦𝘰 𝘮𝘪𝘤𝘳𝘰𝘴𝘤𝘰𝘱𝘺 𝘢𝘯𝘥 𝘯𝘶𝘮𝘦𝘳𝘪𝘤𝘢𝘭 𝘮𝘰𝘥𝘦𝘭𝘪𝘯𝘨 𝘰𝘧 𝘣𝘶𝘣𝘣𝘭𝘦 𝘥𝘺𝘯𝘢𝘮𝘪𝘤𝘴 𝘯𝘦𝘢𝘳 𝘢 𝘴𝘶𝘳𝘧𝘢𝘤𝘦 𝘰𝘧 𝘶𝘳𝘪𝘯𝘢𝘳𝘺 𝘴𝘵𝘰𝘯𝘦» https://lnkd.in/eCZBFv_Y 🔗 ECOGEN publication https://lnkd.in/eBfCuE3r This work was done by my colleague Kevin Schmidmayer and his coauthors. 𝑷.𝑺. 𝑾𝒆 𝒂𝒓𝒆 𝒎𝒂𝒌𝒊𝒏𝒈 𝒔𝒄𝒊𝒆𝒏𝒄𝒆 𝒇𝒐𝒓 𝒆𝒗𝒆𝒓𝒚𝒐𝒏𝒆! #cfd #cae #engineering #physics #simulation #opensource #researchanddevelopment #science #fluiddynamics #multiphase #computing