Joel Serra’s Post

How can we compare simulation results at the continuum scale with those at the pore scale? Well, the fluid geometry can be considered as an interface that provides the opportunity to compare the results of continuum-scale simulations versus the up-scaled pore-scale simulation results. The fluid geometry includes Euler characteristic that cannot be computed by continuum-scale models due to its discontinuous nature. However, we have used a generalized additive model to predict the Euler characteristics at the pore-scale based on the results from continuum-scale simulation. More details on our developed framework can be found in the following paper recently published in Physics of Fluids. https://lnkd.in/dqiE6ZyU James McClure Peyman Mostaghimi Ryan Armstrong

➡ Numerical simulations 🖥 If the constitituve relation is well defined as the failure criterion ... You don't need artifacts to mimic experimental observations. You have just to spend more time ⏱ at the beginning for mechanical properties description ⚠. Be sure about the quantities you are measuring ‼️ LEM3 - UMR CNRS n° 7239 Université de Lorraine Dassault Systèmes #Impact #Perforation #Simulations #Materials #Behavior #Shape #Projectile

Surface tension and adhesion in SPH Decided that I would share with you interesting articles about #simulation that I often have to read for work. I came across this paper thanks to my work related to fluid modeling with #SPH in my favorite #lsdyna. The authors, Nadir Akinci, Gizem Akinci, and Matthias Teschner from the University of Freiburg, have developed approach that realistically simulate natural phenomena like water crown formation and fluid-solid interactions. What caught my attention was their innovative approach to handle large surface tensions and prevent particle clustering at the free surface. This method ensures momentum conservation and accurately models two-way attraction between fluids and solids, which is essential for realistic simulations. Their technique allows for the realistic simulation of various effects, including different wetting conditions, without the need for complex techniques like ghost air phase generation or surface tracking. I suggest you read the article, you will especially enjoy the videos. https://lnkd.in/dUW2KaXD I like it when authors take an original approach to their research! https://lnkd.in/d5tbG9br #engineering #science

🎉 I am delighted and proud to present the first article entirely from my group where one of my Ph.D. students, Gabriel Dante LIMA CHAVES is the first author. This work, published in the CMAME journal as #openaccess, is the numerical implementation of a fully coupled dislocation thermomechanics theory that I had proposed in 2020 (Upadhyay, JMPS 145 (2020) 104150). 📚 Gabriel has done a fantastic job at understanding and numerically implementing a rather complex model involving parabolic, elliptic and hyperbolic p.d.e.s using the #fem. He then demonstrated a rather surprising temperature evolution during dislocation transport. Bravo! This work opens an array of research possibilities in the field of dislocation mechanics! This research has been facilitated by the European Research Council (ERC) through the #h2020 #ERCStG project GAMMA (946959) being conducted at the École Polytechnique Institut Polytechnique de Paris #research #phdstudent #article #mechanics #thermodynamics #fea #finiteelementanalysis #finiteelementmethod

Modeling the inner part of the jet in M87: Confronting jet morphology with theory SCIENCE ADVANCES https://lnkd.in/giV3UUGw

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

I am pleased to announce the publication of our research paper titled "Nonlinear normal modes of highly flexible beam structures modelled under the SE(3) Lie group framework," now available through Springer. This work presents a novel approach to dynamic analysis of geometrically nonlinear structures, introducing a shooting algorithm and a pseudo-arclength continuation method under the SE3 Lie group framework. Our study compares the nonlinear normal modes (NNMs) of structures like doubly clamped beams and cantilever beams with those computed using traditional finite element models. The findings highlight significant differences in dynamic responses and the limitations of the von Kármán strain model in capturing complex nonlinear dynamics. The implications of this research offer a more accurate method for predicting the behavior of flexible nonlinear structures. We invite you to delve into our findings and see how this work could impact your field. Your engagement and sharing of this research within your networks would be highly appreciated. #dynamics #springer https://lnkd.in/efAFtxTn

I am delighted to announce that our new article on the numerical and experimental investigations of supersonic flows around a wedge model at high Reynolds numbers is published in the Physics of Fluids journal of AIP Publishing which is also selected as an Editor's Pick. With a specific focus on incidence shockwave turbulent boundary layer interactions, we investigated respective characteristics of flow visualizations via background oriented schlieren (BOS) and various modelling approaches. CINEA - European Climate, Infrastructure and Environment Executive Agency H2020 MORE&LESS CESTAP Centre of Excellence #schlieren #opticalflow #flowmeasurement #sustainableaviation #sustainableenergy #cfd #modelling #simulation #supersonic

I am thrilled to share that our latest research paper, "Phase-field Simulation of Crack Propagation in Particulate Nanocomposite Materials Considering Surface Stresses," has been published in the archive of applied mechanics journal. https://lnkd.in/dpyyaPHj This work explores crack propagation in particulate nanocomposites through the phase-field method, simulating a variety of load conditions to determine the critical load for crack growth. Our model incorporates surface tension as an inelastic stress in a thermodynamically consistent manner, and we discuss its impact on crack tip velocity and crack evolution. We utilized the finite element method via COMSOL Multiphysics to solve the coupled phase-field and elasticity equations, aiming to model and predict crack propagation in nanocomposites with various nanoparticles under different loadings. Our findings highlight the significant influence of the elastic moduli and surface energy of nanoparticles, as well as their spatial arrangement, on crack propagation kinetics and morphology. Special thanks to my advisor, Dr. Mahdi javanbakht, and my co-advisor, Dr. Hossein J. for their invaluable guidance and support throughout this research in Isfahan University of Technology #Research #Nanocomposites #PhaseFieldMethod #CrackPropagation #NanoMechanics #COMSOL #MaterialScience #ArchiveOfAppliedMechanics

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