Anirban Garai
University of California, San Diego
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Publication
Featured researches published by Anirban Garai.
Journal of the Atmospheric Sciences | 2011
Anirban Garai; Jan Kleissl
AbstractIn a convective boundary layer, coherent structures were detected through their thermal signature on an artificial turf surface using high-frequency thermal infrared (TIR) imagery and surface layer turbulence measurements. The coherent structures cause surface temperature variations over tens of seconds and spatial scales of tens to a few hundred meters. Evidence of processes similar to those in a renewal event was observed. Spatial and temporal correlation analysis revealed the geometric and velocity information of the structures at the ground footprint of air temperature measurements. The velocity of the coherent structures was consistent with the wind speed at 6.5 m AGL. Practical implications of turbulence-driven surface temperature variability for thermal remote sensing are also discussed.
54th AIAA Aerospace Sciences Meeting | 2016
Scott M. Murman; Laslo T. Diosady; Anirban Garai; Marco A. Ceze
The motivation and goals for developing a space-time spectral-element Discontinuous-Galerkin solver for complex separated flows are discussed. The desire for spectral elements in space and time to leverage current and next-generation computing hardware and enable the development of novel subgrid-scale physical models for scaleresolving simulations at practical engineering Reynolds numbers is discussed. Timing results for hardware-optimized kernels are presented and demonstrate the ability of space-time spectral-elements to utilize a significant fraction of the available computing power of an Intel Xeon processor. A dynamic Variational Multiscale Method is developed and applied to the simulation of channel flow at Re� = 544 .
Journal of Turbulence | 2013
Anirban Garai; Jan Kleissl
Surface layer plumes, thermals, downdrafts and roll vortices are the most prominent coherent structures in an unstably stratified boundary layer. They contribute most of the temperature and vertical velocity variance, and their time scales increase with height. The effects of these multi-scale structures (surface layer plumes scale with surface layer depth, thermals scale with boundary layer height and the resulting roll vortices scale with convective time scale) on the surface temperature and ground heat flux were studied using turbulence measurements throughout the atmospheric boundary layer and the surface temperature measurements from an infrared camera. Plumes and thermals imprint on the surface temperature as warm structures and downdrafts imprint as cold structures. The air temperature trace shows a ramp-like pattern, with small ramps overlaid on a large ramp very close to the surface; on the other hand, surface temperature gradually increases and decreases. Turbulent heat flux and ground heat flux...
2018 AIAA Aerospace Sciences Meeting | 2018
Corentin Carton de Wiart; Laslo T. Diosady; Anirban Garai; Nicholas K. Burgess; Patrick J. Blonigan; Dirk Ekelschot; Scott M. Murman
The design of a modular multi-physics high-order space-time finite-element framework is presented together with its extension to allow monolithic coupling of different physics. One of the main objectives of the framework is to perform efficient high-fidelity simulations of capsule/parachute systems. This problem requires simulating multiple physics including, but not limited to, the compressible Navier-Stokes equations, the dynamics of a moving body with mesh deformations and adaptation, the linear shell equations, non-reflective boundary conditions and wall modeling. The solver is based on high-order space-time finite element methods. Continuous, discontinuous and C-discontinuous Galerkin methods are implemented, allowing one to discretize various physical models. Tangent and adjoint sensitivity analysis are also targeted in order to conduct gradient-based optimization, error estimation, mesh adaptation, and flow control, adding another layer of complexity to the framework. The decisions made to tackle these challenges are presented. The discussion focuses first on the “single-physics” solver and later on its extension to the monolithic coupling of different physics. The implementation of different physics modules, relevant to the capsule/parachute system, are also presented. Finally, examples of coupled computations are presented, paving the way to the simulation of the full capsule/parachute system.
Atmospheric Chemistry and Physics | 2014
Marie Lothon; Fabienne Lohou; D. Pino; Fleur Couvreux; Eric R. Pardyjak; Joachim Reuder; J. Vilà-Guerau de Arellano; Pierre Durand; O.K. Hartogensis; D. Legain; Patrick Augustin; Beniamino Gioli; Donald H. Lenschow; Ian C. Faloona; Carlos Yagüe; D. C. Alexander; Wayne M. Angevine; E Bargain; J. Barrié; Eric Bazile; Y. Bezombes; E. Blay-Carreras; A. van de Boer; J. L. Boichard; Aurelien Bourdon; A. Butet; B. Campistron; O. de Coster; Joan Cuxart; A. Dabas
Boundary-Layer Meteorology | 2013
Anirban Garai; Eric R. Pardyjak; G.J. Steeneveld; Jan Kleissl
Atmospheric Chemistry and Physics | 2016
Joan Cuxart; Burkhard Wrenger; Daniel Martínez-Villagrasa; Joachim Reuder; Marius Opsanger Jonassen; M. A. Jimenez; Marie Lothon; F. Lohou; O.K. Hartogensis; Jens Dünnermann; L. Conangla; Anirban Garai
Boundary-Layer Meteorology | 2010
Anirban Garai; Jan Kleissl; Stefan G. Llewellyn Smith
Journal of Fluid Mechanics | 2014
Anirban Garai; Jan Kleissl; Sutanu Sarkar
Journal of Turbomachinery-transactions of The Asme | 2017
Anirban Garai; Laslo T. Diosady; Scott M. Murman; Nateri K. Madavan