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Seminars Digest, Vol 39, Issue 1

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Today's Topics:

1. Friday 03.12.2021 (Serge Krashakov)

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Message: 1
Date: Wed, 1 Dec 2021 00:36:11 +0300
From: Serge Krashakov <sakr@itp.ac.ru>
To: staff@itp.ac.ru, students@itp.ac.ru, seminars@itp.ac.ru
Subject: [Landau ITP Seminars] Friday 03.12.2021
Message-ID: <2bd0f5c0-8ea1-23f9-7fd4-3e131c92078a@itp.ac.ru>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

Уважаемые коллеги!

На заседании Ученого совета в пятницу 3 декабря будут заслушаны 2 доклада:

1) _Вергелес С.С._, Парфеньев В.М., Воинцев И.А., Скоба А.О.
*Структура когерентных геострофических вихрей при конечном числе Россби
и с учётом торцевого трения о границы.*

Сильное вращение делает турбулентный поток квази-двумерным, что приводит
к передаче энергии на крупные масштабы. Недавнее численное моделирование
показывает, что при определенных условиях энергия накапливается в самых
крупных масштабах системы, образуя когерентные вихревые структуры,
известные как конденсаты. Нами проведено аналитическое описание
взаимодействия сильного конденсата со слабыми мелкомасштабными
турбулентными пульсациями и получено уравнение, позволяющее определить
радиальный профиль азимутальной скорости когерентного вихря. При быстром
внешнем вращении профили скоростей циклонов и антициклонов идентичны
друг другу и хорошо описываются линейно-логарифмической зависимостью. По
мере уменьшения внешнего вращения эта симметрия исчезает: максимальная
скорость в циклонах больше, а положение максимума ближе к оси вихря по
сравнению с антициклонами. Кроме того, наш анализ показывает, что размер
антициклона не может превышать определенного критического значения,
которое зависит от чисел Россби и Рейнольдса. Максимальный размер
циклонов ограничен только размером системы при тех же условиях. Далее,
мы учли граничные эффекты. Для типичных экспериментальных условий
профиль скорости конденсата на достаточно большом расстояниях от оси
вихря определяется линейным трением Экмана, связанным с условиями
прилипания на нижней и верхней границах течения. На указанных
расстояниях азимутальная скорость когерентного вихря не зависит от
расстояния до центра вихря и определяется энергетическим балансом между
мощностью накачки и трением о границы. Мы исследуем структуру
когерентного вихря в этом случае и сравниваем результаты с профилем
скорости конденсата в двумерных системах.
[1] Vladimir Parfenyev and Sergey Vergeles. Influence of Ekman friction
on the velocity profile of a coherent vortex in a three-dimensional
rotating turbulent flow, Physics of Fluids 33, 115128 (2021).
[2] Parfenyev, V. M., Vointsev, I. A., Skoba, A. O., & Vergeles, S. S.
(2021). Velocity profiles of cyclones and anticyclones in a rotating
turbulent flow. Physics of Fluids, 33(6), 065117.

2) _Вергелес С.С.,_ Ефремова Е.А., Перминов С.В. (короткий доклад)
*Соответствие типа спектра дифракции на субволновой резонансной решётке
и её профиля**
*
Мы изучаем резонансы при дифракции на субволновой диэлектрической
структуре без потерь, периодической в одном направлении и бесконечной в
ортогональном. Показано, что тип дифракционного спектра на решётке
определяется геометрическим коэффициентом заполнения и степенью
асимметрии её профиля. Эти два параметра являются линейными функциями
комплексной амплитуды второй пространственной гармоники Фурье
распределения материала в сетке..
[1] Efremova, E. A., Perminov, S. V., & Vergeles, S. S. (2021).
Resonance behavior of diffraction on encapsulated guided-mode grating of
subwavelength thickness. Photonics and Nanostructures-Fundamentals and
Applications, 46, 100953.

ID и пароль онлайн-трансляции в Zoom те же, что и для предыдущих
трансляций докладов на Ученом совете:
https://zoom.us/j/96899364518?pwd=MzBsR2lYT0lYL2x2b1oyNU9LeWlWUT09
Meeting ID: 968 9936 4518
Пароль: 250319

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Discovery: Giant comet was active way farther from the sun than expected

Discovery: Giant comet was active way farther from the sun than expected | NASA postpones spacewalk at space station due to space debris warning | You can still save 35% on a DJI Mini 2 Drone in this Adorama deal Created for znamenski.spacecom@blogger.com |  Web Version November 30, 2021 CONNECT WITH SPACE.COM       Something amazing every day. SIGN UP ⋅   WEBSITE   The Launchpad Discovery: Giant comet was active way farther from the sun than expected (NOIRLab/NSF/AURA/J. da Silva/Spaceengine) A new study led by astronomers at the University of Maryland shows that Comet Bernardinelli-Bernstein (BB) became active much farther from the sun than expected. So far out, temperatures are too cold for water ice to turn to vapor. Full Story: Space (11/30)      NASA postpones spacewalk at space station due to space debris warning (NASA) A scheduled spacewalk by two NASA astronauts outside of the International Space Station has been postponed after a debris warning for the orbiting outpost caused NASA to act on the side of caution. Full Story: Space (11/30)      You can still save 35% on a DJI Mini 2 Drone in this Adorama deal (Adorama) f you're in the market for a beginner-friendly drone, you can't go wrong with the DJI Mini 2 and it's still on sale. This mini drone is on sale for $449 at Adorama, 35% off its original price of $693.89. Full Story: Space (11/29)      Spaceflight Can SpaceX's Starlink sue Russia for anti-satellite missile test space debris fallout? A fleet of SpaceX Starlink internet satellites poised for deployment in orbit (SpaceX) Experts agree that the Russian anti-satellite missile test that shattered into pieces the defunct surveillance satellite Cosmos 1408 on Nov. 15. will cause headaches to operators of low Earth orbit satellites for years. Can they hold the culprit accountable? Full Story: Space (11/30)      Japanese billionaire Yusaku Maezawa launching to space station next week (Roscosmos) A Russian Soyuz spacecraft carrying Japanese billionaire Yusaku Maezawa, video producer Yozo Hirano and cosmonaut Alexander Misurkin is scheduled to launch from the Baikonur Cosmodrome in Kazakhstan on Dec. 8. Full Story: Space (11/30)      China launches new communications satellite ChinaSat 1D (CASC) China continued its stream of rocket launches on Friday (Nov. 26) by lofting a new communications satellite into a geosynchronous transfer orbit. 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Full Story: Space (11/30)      NASA's James Webb Space Telescope on track for Dec. 22 launch (NASA/Chris Gunn) An incident during processing earlier this month didn't cause any serious problems, NASA determined. Full Story: Space (11/30)      Featured Content Sponsored Content from Dell Black Friday Deal: E2722H Monitor 26% Off +$50 Dell eGift card Black Friday Deal: E2722HS Monitor 26% Off +$50 Dell eGift card Black Friday Deal: Dell Conference Room Monitor 25% Off +$150 Dell eGift card Black Friday Deal: Ultrasharp 8k Monitor 25% Off +$150 Dell eGift card Black Friday Deal: UltraSharp 4K HDR Monitor 25% Off +$150 Dell eGift card Technology Laptop deal: The VR-ready Lenovo Legion 7i Gen 6 is $350 off, but the deal ends soon (Lenovo) Save 15% on this powerful gaming laptop - ideal for running AAA games and VR headsets. 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