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‎2022/pdf/AHB.html‎

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<p class="p1"><span class="s1">9/11/2022 Friday<span class="Apple-converted-space">  </span>11h55<span class="Apple-converted-space">  </span>to 11h30</span></p>
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<p class="p2">Mr Alberto Hananel Baigorria</p>
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<p class="p3"><br></p>
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<p class="p2">[email protected]</p>
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<p class="p2">Peru</p>
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<p class="p2">Universidad de Granada</p>
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<p class="p2">https://ctivitae.concytec.gob.pe/appDirectorioCTI/VerDatosInvestigador.do id_investigador=95007</p>
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<p class="p3"><br></p>
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<p class="p2"><b><i>Variational Evolutionary Splines for Solving a Model of Temporomandibular Disorders<span class="Apple-converted-space"> </span></i></b></p>
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<p class="p3"><br></p>
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<p class="p2"><span class="Apple-converted-space"> </span>The aim of this work is to modelize the occlusion of a person with temporomandibular disorders as an evolutionary equation and approach its solution by the construction and characterizing of discrete variational splines. To formulate the problem, certain boundary conditions have been considered. After showing the existence and the uniqueness of the solution of such a problem, a convergence result of a discrete variational evolutionary spline is shown. A stress analysis of the occlusion of a human jaw with temporomandibular disorders by finite elements is carried out in FreeFem++ in order to prove the validity of the presented method.</p>
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‎2022/pdf/AS.html‎

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<p class="p1"><span class="s1">9/11/2022 Friday<span class="Apple-converted-space">  </span>10h40 to 11h05</span></p>
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<p class="p2">Atsushi Suzuki</p>
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<p class="p3"><br></p>
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<p class="p2">[email protected]</p>
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<p class="p2">Japan</p>
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<p class="p2">RIKEN Center for Computational Science</p>
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<p class="p3"><br></p>
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<p class="p3"><br></p>
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<p class="p2"><b><i>Dissection sparse direct solver with mixed precision arithmetic for smaller memory footprint abstract</i></b></p>
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<p class="p3"><br></p>
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<p class="p2">Sparse direct solver is the most robust linear solver for finite element methods where the stiffness matrix may be sometimes singular due to artificial boundary conditions by mathematical modeling or by numerical algorithm. It is better to use direct solver especially for designing phase of numerical algorithm for new physical models. I will present a factorization procedure in a hybrid way by decomposing the coefficient matrix into a union of moderate part where factorization by single precision is acceptable and of hard part where the corresponding Schur complement may be singular, which is performed automatically during factorization phase. The last Schur complement is generated by iterative solver and overall solution has same accuracy as the standard factorization but memory footprint is drastically reduced thanks to lower precision arithmetic.</p>
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<p class="p1">Thursday<span class="Apple-converted-space">  </span>8/12/22 14h00 <span class="Apple-converted-space">  </span><b>Mr Christopher Douglas</b></p>
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<p class="p2"><br></p>
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<p class="p1">[email protected]</p>
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<p class="p1">France</p>
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<p class="p1">École Polytechnique</p>
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<p class="p2"><br></p>
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<p class="p2"><br></p>
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<p class="p1"><b><i>A parallel framework for numerical continuation and bifurcation analysis in FreeFEM and its application to swirling jet flows.<span class="Apple-converted-space"> </span></i></b></p>
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<p class="p2"><br></p>
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<p class="p1"><span class="Apple-converted-space"> </span>ABSTRACT: Large-scale nonlinear systems are widely studied via time-marching numerical simulations. Nonetheless, due to their inherent focus on the detailed evolution of a single initial condition, such simulations provide only a narrow view into the overall dynamics of a system as its parameters are varied. On the other hand, numerical continuation and bifurcation analysis focus on the time-asymptotic behavior of nonlinear systems from a state-space perspective. These tools efficiently generate `maps of solutions' that provide generic insight into the overall dynamic behavior of a system without interrogating specific initial conditions. In this talk, a framework for performing such analyses in systems of PDE's via FreeFEM/PETSc is discussed and demonstrated in the flow of a swirling jet.<span class="Apple-converted-space">  </span>ACKNOWLEDGEMENT: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 899987.</p>
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‎2022/pdf/GS.html‎

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<p class="p1"><span class="s1">9/11/2022 Friday<span class="Apple-converted-space">  </span>11h05 to 11h30</span></p>
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<p class="p2"><b>G. Sadaka ,</b> I Danalia, V. Kalt<span class="Apple-converted-space"> </span></p>
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<p class="p3"><br></p>
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<p class="p2">LMRS, Universite de Rouen.</p>
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<p class="p3"><b></b><br></p>
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<p class="p2"><span class="s1"><b><i>A finite element toolbox for the Bogoliubov-de Gennes stability analysis of Bose-Einstein condensates</i></b></span></p>
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<p class="p1"><span class="s1"><br>
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<p class="p1"><span class="s1"><b>Four years of scientific computing using FreeFEM in the field of computational biomedical engineering<span class="Apple-converted-space"> </span></b></span></p>
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<p class="p2"><span class="s1">Mojtaba Barzegari, Laura Lafuente-Gracia, Liesbet Geris<span class="Apple-converted-space"> </span></span></p>
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<p class="p3"><span class="s1">Biomechanics Section, Department of Mechanical Engineering, KU Leuven, Leuven, Belgium<span class="Apple-converted-space"> </span></span></p>
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<p class="p4"><span class="s1">Over the past four years, the open-source finite element solver FreeFEM has been extensively used in the computational biomechanics research unit (http://www.biomech.ulg.ac.be/) for a wide range of simulations and modeling studies in the field of computational biomedical engineering and </span><span class="s2"><i>in silico </i></span><span class="s1">medicine. FreeFEM integration with a couple of powerful scientific computing tools and libraries, such as PETSc, HPDDM, Mmg (and ParMmg), Tetgen, METIS (and ParMETIS), SCOTCH, etc., allowed us to take advantage of this open-source domain-specific language efficiently in the development of multiple types of computational models. This benefit has been boosted by the available features to work with various mesh formats, allowing us to use FreeFEM codes in different stages of our modeling workflows.<span class="Apple-converted-space"> </span></span></p>
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<p class="p4"><span class="s1">In this talk, a brief overview of the following carried out research works, with FreeFEM being part of the modeling workflow, will be presented:<span class="Apple-converted-space"> </span></span></p>
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<ul class="ul1">
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">Computational modeling of the biodegradation process of metallic biomaterials, developed by deriving a system of time-dependent reaction-diffusion-convection PDEs coupled with Navier- Stokes equations for hydrodynamics conditions and a level-set formalism for tracking the morphological changes. </span><span class="s4"><br>
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</span></li>
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">BioDeg, an open-source software written in FreeFEM, Python, and C++ for simulating the degradation behavior of medical devices, built on top of the biodegradation model with a cross- platform user interface developed using Qt. </span><span class="s4"><br>
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</span></li>
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">Tissue growth models, in which the growth of newly formed tissue in various processes were modeled using moving boundary approaches and interface tracking methods, implemented using both the phase-field and level-set methods in 2D and 3D. </span><span class="s4"><br>
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</span></li>
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">Bone fracture healing models, where a system of non-linear taxis-diffusion-reaction PDEs describing the spatiotemporal evolution of biochemical factors, cells, and tissues was derived and coupled with discrete representation of blood vessels for simulating bone regeneration. </span><span class="s4"><br>
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</span></li>
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">Pancreatic cells viability, a time-dependent reaction-diffusion model to investigate whether groups of cells can survive in various conditions prior to transplantation. </span><span class="s4"><br>
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</span></li>
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">Geometry construction and mesh generation for various open-porous tissue engineering scaffolds created based on TPMS lattice infills. </span><span class="s4"><br>
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</span></li>
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">Integrating topology optimization approaches with biodegradation models to simulate the mechanical integrity of infilled structures for medical applications. </span><span class="s4"><br>
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</span></li>
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">Building a structural analysis component for open-source software TFMLab, a traction-force microscopy code to compute active cellular forces. </span><span class="s4"><br>
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</span></li>
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<li class="li4"><span class="s3"></span><span class="s1"></span><span class="s2">  </span><span class="s1">A case study demonstrating HPC approaches: modeling the degradation behavior of a stiffness- optimized patient-specific porous implant, leading to a computational model with 46M elements simulated using 2K CPU cores, with scaling tests being performed on MPI sizes of 2K-8K. </span><span class="s4"><br>
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‎2022/pdf/PV.html‎

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<p class="p1"><span class="s1">9/11/2022 Friday<span class="Apple-converted-space">  </span>11h30 to 11h55</span></p>
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<p class="p1"><span class="s2">Pascal<span class="Apple-converted-space">  </span>Ventura </span><span class="s1"><br>
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Laboratoire LEM3</span></p>
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<p class="p1"><span class="s1">Université de Lorraine<span class="Apple-converted-space"> </span></span></p>
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<p class="p1"><span class="s1"><br>
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‎2022/pdf/SGHH.html‎

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<p class="p1">Friday 9/12/2022 VENDREDI<span class="Apple-converted-space">  </span>de 9h0 to<span class="Apple-converted-space">  </span>9h40<span class="Apple-converted-space"> </span></p>
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<p class="p2"><br></p>
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<p class="p1">Simon Garnotel et<span class="Apple-converted-space">  </span>Houssam Houssein</p>
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<p class="p2"><br></p>
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<p class="p1">[email protected]</p>
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<p class="p1">France</p>
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<p class="p1">Airthium</p>
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<p class="p1">https://airthium.com/</p>
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<p class="p2"><br></p>
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<p class="p1"><b><i>Tanatloc: A FreeFEM graphical user interface</i></b><i><span class="Apple-converted-space"> </span></i></p>
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<p class="p2"><br></p>
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<p class="p1">Developing a seasonal energy storage system, is one of the Airthium principal goals. In order to accomplish this goal, many physical simulations must be done, and FreeFEM was selected for this mission. The physical simulations encountered are very varied, we can cite for example, fluid and solid mechanics, in addition to contact mechanics . As in most numerical simulations, the physical problem remains the same, and our final users are our mechanical engineers, a graphical user interface of FreeFEM is very useful to run the simulations and to choose the corresponding parameters without worrying about the FreeFEM code. We developed this graphical user interface of FreeFEM, called Tanatloc, which can help • importing 2D and 3D geometries • choosing the finite element type and the solver • choosing the materials and selecting the boundary conditions • running the simulation locally or in the cloud and showing the results Tanatloc is now available and open-source on the internet, and integrate a code editor allowing researchers to create their own algorithms and take advantage of the corresponding graphic interfacing. In this presentation, we will present Tanatloc, and simulate live an applied example.</p>
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<p class="p1">9/11/2022 Friday<span class="Apple-converted-space">  </span>9h45 to 10h10</p>
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<p class="p1">Stephen Moore</p>
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<p class="p1">[email protected]</p>
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<p class="p1">Ghana</p>
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<p class="p2"><br></p>
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<p class="p1">university of cape coast</p>
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<p class="p1">http://moorestephen.info</p>
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<p class="p2"><br></p>
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<p class="p1"><b><i>A stable space–time finite element method for parabolic evolution problems<span class="Apple-converted-space"> </span></i></b></p>
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<p class="p1"><span class="Apple-converted-space"> </span>In this talk, we present the analysis of a new stable space–time finite element method (FEM) for the numerical solution of parabolic evolution problems in moving spatial computational domains. The discrete bilinear form is elliptic on the FEM space with respect to a discrete energy norm. This property together with a corresponding boundedness property, consistency and approximation results for the FEM spaces yield an a priori discretization error estimate with respect to the discrete norm. Finally, using FreeFem++, we confirm the theoretical results with numerical experiments in spatial moving domains.</p>
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