000013414 001__ 13414
000013414 005__ 20161114164234.0
000013414 04107 $$aeng
000013414 046__ $$k2011-05-25
000013414 100__ $$aCasadei, F.
000013414 24500 $$aStrong and Weak Forms of a Fully Non-Conforming Fsi Algorithm in Fast Transient Dynamics for Blast Loading of Structures

000013414 24630 $$n3.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000013414 260__ $$bNational Technical University of Athens, 2011
000013414 506__ $$arestricted
000013414 520__ $$2eng$$aThe simulation of blast loading effects on structures undergoing very large deformations, possibly up to complete failure and fragmentation, requires robust and specific Fluid-Structure Interaction (FSI) algorithms. The FLSR algorithm uses fully non-conforming fluid and structure meshes (the structure is “embedded” within the fluid), that are “strongly” coupled by suitable constraints on velocities near the F-S interface, enforced by Lagrange multipliers. This technique allows using a regular (or even a structured, typically Eulerian) fluid mesh, while the structure is Lagrangian and can undergo failure and fragmentation without the mesh entanglement difficulties that would arise with more traditional (conforming) FSI algorithms. However, the localization of coupled F-S nodes is more expensive than in the conforming case and must be continuously updated, by means of fast search algorithms, as the structure moves and deforms. The strong form of the algorithm (FLSR) is suitable for a Finite Element (FE) description of the fluid domain and has been used with success in large realistic simulations. Application to Node-Centered Finite Volumes (NCFV) requires an additional treatment of numerical fluxes, presented in the paper. Recently a “weak” variant of the algorithm (FLSW) has been developed for use with Cell-Centered Finite Volumes (CCFV) in the fluid domain. Suitable pressure (interaction) forces are used for the coupling, rather than strong conditions on velocities. Like for NCFV, appropriate treatment of numerical fluxes is required. The rationale and implications of this choice are discussed in the paper.

000013414 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013414 653__ $$aFluid-Structure Interaction, Transient Dynamics, Blast Loading.

000013414 7112_ $$aCOMPDYN 2011 - 3rd International Thematic Conference$$cIsland of Corfu (GR)$$d2011-05-25 / 2011-05-28$$gCOMPDYN2011
000013414 720__ $$aCasadei, F.$$iLarcher, M.$$iLeconte, N.
000013414 8560_ $$ffischerc@itam.cas.cz
000013414 8564_ $$s1800152$$uhttps://invenio.itam.cas.cz/record/13414/files/074.pdf$$yOriginal version of the author's contribution as presented on CD, section: MS 13 Innovative Algorithms for Transient Computations.
000013414 962__ $$r13401
000013414 980__ $$aPAPER