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UID:0-1572@aerospace.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20260706T133000

DTEND;TZID=Asia/Jerusalem:20260706T143000

DTSTAMP:20260524T091957Z

URL:https://aerospace.technion.ac.il/events/seminar-ohad-haftka-6july26/

SUMMARY:Sound Transmission Through a Slitted Wall at Non-Continuum Conditio
 ns
DESCRIPTION:Lecturer:Ohad Haftka‬‏\n Faculty:The Stephen B. Klein Facul
 ty of Aerospace Engineering\n Institute:Technion – Israel Institute of T
 echnology\n Location:Classroom 240\, 1st floor\, Aerospace Eng. building\n
  Zoom: https://technion.zoom.us/j/98372598857\n Abstract: This talk presen
 ts a study of the transmission of sound waves through periodically slitted
  walls in regimes where the characteristic aperture size and acoustic wave
 length are comparable to the molecular mean free path of the gas. The acou
 stic field is generated by small-amplitude normal oscillations of a vibrat
 ing wall located upstream of the perforated plate.\nThe problem is investi
 gated across the full range of gas rarefaction rates\, combining free-mole
 cular and continuum-limit analyses with direct simulation Monte Carlo (DSM
 C) calculations.\nThe results indicate a qualitative transition in the dir
 ectivity of the acoustic field with gas rarefaction. Under free-molecular 
 conditions\, the transmitted field is strongly anisotropic\, owing to geom
 etrical filtering of molecular velocities by the slits. In the continuum l
 imit\, collisions promote isotropy in the molecular velocity distribution\
 , such that each slit behaves as a localized mass monopole source.\nIn cas
 es where the wall slits are sufficiently close\, non-monotonic variations 
 in transmission with slit spacing are observed\, representing Rayleigh's a
 nomaly\, which gives rise to extraordinary transmission.\nThis behavior is
  consistently captured by both DSMC simulations and continuum-limit predic
 tions.\nMulti-slit interactions are attenuated strongly by rarefaction\, a
 nd extraordinary transmission is not observed at highly rarefied condition
 s.\n\nThis work is towards an M.Sc. degree under the supervision of Assoc.
  Prof. Avshalom Manela of Aerospace Engineering\, Technion. Coadvisor: Dr.
  Yaron Ben-Ami\, Wolfson Centre for Mathematical Biology\, Mathematical In
 stitute\, University of Oxford.\n Details: \n 
CATEGORIES:Seminars
LOCATION:Classroom 240\, 1st floor\, Aerospace Eng. building

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