BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//6.6.4.4//EN TZID:Asia/Jerusalem X-WR-TIMEZONE:Asia/Jerusalem BEGIN:VEVENT UID:0-1530@aerospace.technion.ac.il DTSTART;TZID=Asia/Jerusalem:20260209T133000 DTEND;TZID=Asia/Jerusalem:20260209T143000 DTSTAMP:20260104T144955Z URL:https://aerospace.technion.ac.il/events/seminar-slot-2026-02-09/ SUMMARY:Physically Consistent Outflow Boundary Conditions for Global Stabil ity Analysis of Bluff Body Wakes DESCRIPTION:Lecturer:Amit Sigawi\n Faculty:The Stephen B. Klein Faculty of Aerospace Engineering\n Institute:Technion – Israel Institute of Technol ogy\n Location:Classroom 165\, ground floor\, Library\, Aerospace Eng.\n Z oom: https://technion.zoom.us/j/93549691766\n Abstract: Global linear stab ility analysis of bluff body wakes must be carried out on truncated comput ational domains\, even though the physical problem is unbounded. Because t he global eigenfunctions are not known a priori\, the outlet location and the outflow boundary condition are often selected heuristically and valida ted a posteriori by inspecting the computed eigenspectrum and eigenfunctio ns. In practice\, standard outflow treatments can create a localized non-p hysical region near the outlet\, which is then identified in post-processi ng and excluded from physical interpretation. To mitigate these outlet eff ects\, the downstream boundary is often moved farther away by extending th e computational domain\, increasing the computational cost.\n\n \;\n\n  \;\n\nThis seminar presents a matrix-forming BiGlobal stability frame work based on finite-difference discretization and assesses how the outflo w boundary condition influences the predicted eigenspectrum and eigenmodes . Common outlet closures (Dirichlet\, Neumann\, and extrapolation-type) ar e compared with a physically consistent Robin boundary condition that inco rporates local linear stability theory information at the outlet. For stea dy\, incompressible\, low Reynolds number (of order of 100) wakes of cylin ders and airfoils at high angles of attack\, the proposed Robin condition eliminates outlet-induced artifacts and yields robust convergence\, even w hen the computational domain is severely truncated. Our findings pave the way for efficient and accurate computations of global eigenfunctions in mo re complex flows.\n\n \;\n\n \;\n\n \;\n\n \;\n Details: \ n CATEGORIES:Seminars,סמינרים LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng. END:VEVENT BEGIN:VTIMEZONE TZID:Asia/Jerusalem X-LIC-LOCATION:Asia/Jerusalem BEGIN:STANDARD DTSTART:20251026T010000 TZOFFSETFROM:+0300 TZOFFSETTO:+0200 TZNAME:IST END:STANDARD END:VTIMEZONE END:VCALENDAR