scholarly journals Theoretical and numerical study on high frequency vibrational convection: Influence of the vibration direction on the flow structure

2019 ◽  
Vol 31 (4) ◽  
pp. 043605 ◽  
Author(s):  
Samia Bouarab ◽  
Faiza Mokhtari ◽  
Slim Kaddeche ◽  
Daniel Henry ◽  
Valéry Botton ◽  
...  
Keyword(s):  
Flow Structure ◽  
High Frequency ◽  
Numerical Study ◽  
Vibration Direction ◽  
Vibrational Convection

scholarly journals Numerical study of heat transfer and flow structure over a microscale backstep

2021 ◽  
Vol 60 (3) ◽  
pp. 2759-2768
Author(s):  
Hassnia Hajji ◽  
Lioua Kolsi ◽  
Kaouther Ghachem ◽  
Chemseddine Maatki ◽  
Ahmed Kadhim Hussein ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Flow Structure ◽  
Numerical Study

An experimental and numerical study of high-frequency Raman scattering in argon gas

1993 ◽  
Vol 173 (2) ◽  
pp. 153-159 ◽  
Author(s):  
François Chapeau-Blondeau ◽  
Victor Teboul ◽  
Jacques Berrué ◽  
Yves le Duff
Keyword(s):  
Raman Scattering ◽  
High Frequency ◽  
Numerical Study ◽  
Argon Gas

scholarly journals Observation and a numerical study of gravity waves during tropical cyclone Ivan~(2008)

2013 ◽  
Vol 13 (4) ◽  
pp. 10757-10807 ◽  
Author(s):  
F. Chane Ming ◽  
C. Ibrahim ◽  
S. Jolivet ◽  
P. Keckhut ◽  
Y.-A. Liou ◽  
...  
Keyword(s):  
Tropical Cyclone ◽  
Gravity Waves ◽  
High Frequency ◽  
Lower Stratosphere ◽  
Numerical Study ◽  
Wide Spectrum ◽  
Spectral Characteristics ◽  
Background Wind ◽  
Quasi Biennial Oscillation ◽  
North East

Abstract. Activity and spectral characteristics of gravity-waves (GWs) are analyzed during tropical cyclone (TC) Ivan (2008) in the troposphere and lower stratosphere using radiosonde and GPS radio occultation data, ECMWF outputs and simulations of French numerical model Meso-NH with vertical resolution varying between 150 m near the surface and 500 m in the lower stratosphere. Conventional methods for GW analysis and signal and image processing tools provide information on a wide spectrum of GWs with horizontal wavelengths of 40–1800 km and short vertical wavelengths of 0.6–10 km respectively and periods of 20 min–2 days. MesoNH model, initialized with Aladin-Réunion analyses, produces realistic and detailed description of TC dynamics, GWs, variability of the tropospheric and stratospheric background wind and TC rainband characteristics at different stages of TC Ivan. In particular a dominant eastward propagating TC-related quasi-inertia GW is present during intensification of TC Ivan with horizontal and vertical wavelengths of 400–600 km and 1.5–3.5 km respectively during intensification. A wavenumber-1 vortex Rossby wave is identified as a source of this medium-scale mode while short-scale modes located at north-east and south-east of the TC could be attributed to strong localized convection in spiral bands resulting from wavenumber-2 vortex Rossby waves. Meso-NH simulations also reveal high-frequency GWs with horizontal wavelengths of 20–80 km near the TC eye and high-frequency GWs-related clouds behind TC Ivan. In addition, GWs produced during landfall are likely to strongly contribute to background wind in the middle and upper troposphere as well as the stratospheric quasi-biennial oscillation.

3D numerical study on flow structure and heat transfer in a circular tube with V-baffles

2015 ◽  
Vol 23 (2) ◽  
pp. 342-349 ◽  
Author(s):  
Withada Jedsadaratanachai ◽  
Nuthvipa Jayranaiwachira ◽  
Pongjet Promvonge
Keyword(s):  
Heat Transfer ◽  
Flow Structure ◽  
Circular Tube ◽  
Numerical Study

Experimental and numerical study of high frequency superconducting air-core transformer

2021 ◽  
Author(s):  
Guanjie Liu ◽  
GuoMin Zhang ◽  
Guole Liu ◽  
Liwei Jing ◽  
Haonan Wang
Keyword(s):  
High Frequency ◽  
Numerical Study ◽  
Air Core

Flow Stucture of Supersonic Underexpanded Jet With Microjets Injection

2013 ◽  
Vol 8 (1) ◽  
pp. 44-55
Author(s):  
Dmitriy Gubanov ◽  
Valeriy Zapryagaev ◽  
Nikolay Kiselev
Keyword(s):  
Flow Structure ◽  
Numerical Study ◽  
Mixing Layer ◽  
Supersonic Jet ◽  
Wave Structure ◽  
Streamwise Vortices ◽  
Jet Mixing ◽  
Underexpanded Jet ◽  
Supersonic Underexpanded Jet ◽  
The Impact

Experimental and numerical study of transversal microjets injection influence on the supersonic underexpanded jet flow structure has been performed. Data of measurements and calculation have acceptable agreement. Interaction of microjets with main supersonic jet sets to a decrease of an initial gasdynamic region. Microjets lead to a longitudinal streamwise vortices generation and a mushroom-like flow structures create on an external jet mixing layer. Dissipation of longitudinal streamwise vortices was observed at the second jet cell. Complex gasdynamic flow structure of the supersonic underexpanded jet interacting with supersonic microjets has been studied for the first time. This structure contains system of complex chock waves and expansion waves spreading from the position of the impact microjets/main jet localization place. Future of interaction process a chock-wave structure of main jet with additional shock waves has been studied

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