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:0-458@aerospace.technion.ac.il DTSTART;TZID=Asia/Jerusalem:20170201T163000 DTEND;TZID=Asia/Jerusalem:20170201T173000 DTSTAMP:20230603T190659Z URL:https://aerospace.technion.ac.il/events/towards-a-general-methodology- for-modeling-the-pressure-buildup-behind-porous-media-that-is-impinged-by- a-shock-wave/ SUMMARY:Towards a General Methodology for Modeling the Pressure Buildup beh ind Porous Media that is Impinged by a Shock Wave DESCRIPTION:Lecturer:Omri Ram\n Faculty:Department of Mechanical Engineerin g\n Institute:Ben-Gurion University\n Location:Classroom 165\, ground floo r\, Library\, Aerospace Eng.\n Zoom: \n Abstract: \n Details: \n There are several scenarios where shock waves impinge on porous media. Each of thes e scenarios requires different numerical and experimental approaches to pr edict the intricate shock diffractions and the developing flow fields. As a result\, a universal technique to model them all does not exist. In term s of protective structures\, designers are ultimately required to predict the pressure build up and developing loads behind porous media that are us ed as passive protection to hinder the shock propagation and mitigate the overall load inflicted by it on a structure. Following an experimental stu dy of the parameters affecting the pressure build up in a confined volume behind porous filters impinged by normal shock waves\, a new constitutive model that provided the non-dimensional behavior of the results was derive d (Ram &\; Sadot 2013). A more in-depth analysis of the governing physi cs led to a new understanding of the universality of shock-porous barrier interactions. The results showed that porous barriers placed in the flow f ield acted as low pass filters on the pressure wave. These findings provid ed a physical basis to formulate a new approach that enables studying inte ractions of shock waves and porous barriers. The approach\, addresses ever y porous barrier along with the air confined in it as a single mechanical system. Using this perspective\, a transfer function that links the impose d load at the frontal face of the porous barrier and the developing loads behind it can be found (Ram &\; Sadot 2015). This methodology was appli ed to the case where an explosion-generated blast wave impinged on the fro ntal façade of a structure having a complex inner geometry. A rapid predi ction of the developing loads inside the structure was obtained. This appr oach can replace the need to use a grueling CFD code to simulate the pheno menon (Ram\, Nof &\; Sadot 2016). The methodology was also employed to study the pressure buildup\, following shock impingement\, behind an array of perforated plates. This scenario was poorly understood due to the very complicated shock induced flow field. This method led to a new understand ing of the pressure buildup behind a set of perforated plates including th e influence of different porosities\, different number of plates and diffe rent gasses. CATEGORIES:Seminars LOCATION:Classroom 165\, ground floor\, Library\, Aerospace Eng. END:VEVENT BEGIN:VTIMEZONE TZID:Asia/Jerusalem X-LIC-LOCATION:Asia/Jerusalem BEGIN:STANDARD DTSTART:20161030T010000 TZOFFSETFROM:+0300 TZOFFSETTO:+0200 TZNAME:IST END:STANDARD END:VTIMEZONE END:VCALENDAR