scholarly journals Cylinder Wake Stabilization Using a Minimal Energy Compensator

2016 ◽  
pp. 335-348
Author(s):  
Marco Carini ◽  
Jan Oscar Pralits ◽  
Paolo Luchini
Keyword(s):  
Cylinder Wake ◽  
Minimal Energy

FLOW-VISUALIZATION OF A TWO SIDE-BY-SIDE CYLINDER WAKE

2002 ◽  
Vol 9 (2-3) ◽  
pp. 16 ◽  
Author(s):  
Zhiwen WANG ◽  
Y. Zhou ◽  
Hui Li
Keyword(s):  
Flow Visualization ◽  
Cylinder Wake

Eco-Friendly Synthesis of Pyrazoline Derivatives

2017 ◽  
Vol 9 (04) ◽  
Author(s):  
Mahesh G. Kharatmol ◽  
Deepali Jagdale
Keyword(s):  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Organic Synthesis ◽  
Ultrasonic Irradiation ◽  
Minimal Energy ◽  
Anticancer Activities ◽  
Conventional Methods

Pyrazoline class of compounds serve as better moieties for an array of treatments, they have antibacterial, antifungal, antiinflammatory, antipyretic, diuretic, cardiovascular activities. Apart from these they also have anticancer activities. So, pertaining to its importance, many attempts are made to synthesize pyrazolines. Since conventional methods of organic synthesis are energy and time consuming. There are elaborate pathways for green and eco-friendly synthesis of pyrazoline derivatives including microwave irradiation, ultrasonic irradiation, grinding and use of ionic liquids which assures the synthesis of the same within much lesser time and by use of minimal energy

Wake Flow of Single and Multiple Yawed Cylinders

2004 ◽  
Vol 126 (5) ◽  
pp. 861-870 ◽  
Author(s):  
A. Thakur ◽  
X. Liu ◽  
J. S. Marshall
Keyword(s):  
Computational Study ◽  
Three Dimensional ◽  
Side Wall ◽  
Wake Flow ◽  
Upstream Region ◽  
Two Dimensional ◽  
Cylinder Wake ◽  
Dimensional Approximation ◽  
The Face ◽  
Drag And Lift

An experimental and computational study is performed of the wake flow behind a single yawed cylinder and a pair of parallel yawed cylinders placed in tandem. The experiments are performed for a yawed cylinder and a pair of yawed cylinders towed in a tank. Laser-induced fluorescence is used for flow visualization and particle-image velocimetry is used for quantitative velocity and vorticity measurement. Computations are performed using a second-order accurate block-structured finite-volume method with periodic boundary conditions along the cylinder axis. Results are applied to assess the applicability of a quasi-two-dimensional approximation, which assumes that the flow field is the same for any slice of the flow over the cylinder cross section. For a single cylinder, it is found that the cylinder wake vortices approach a quasi-two-dimensional state away from the cylinder upstream end for all cases examined (in which the cylinder yaw angle covers the range 0⩽ϕ⩽60°). Within the upstream region, the vortex orientation is found to be influenced by the tank side-wall boundary condition relative to the cylinder. For the case of two parallel yawed cylinders, vortices shed from the upstream cylinder are found to remain nearly quasi-two-dimensional as they are advected back and reach within about a cylinder diameter from the face of the downstream cylinder. As the vortices advect closer to the cylinder, the vortex cores become highly deformed and wrap around the downstream cylinder face. Three-dimensional perturbations of the upstream vortices are amplified as the vortices impact upon the downstream cylinder, such that during the final stages of vortex impact the quasi-two-dimensional nature of the flow breaks down and the vorticity field for the impacting vortices acquire significant three-dimensional perturbations. Quasi-two-dimensional and fully three-dimensional computational results are compared to assess the accuracy of the quasi-two-dimensional approximation in prediction of drag and lift coefficients of the cylinders.

scholarly journals Energy transfer mechanisms and resolvent analysis in the cylinder wake

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Bo Jin ◽  
Sean Symon ◽  
Simon J. Illingworth
Keyword(s):  
Energy Transfer ◽  
Cylinder Wake ◽  
Transfer Mechanisms

scholarly journals Control of port-Hamiltonian systems with minimal energy supply

2021 ◽  
Author(s):  
Manuel Schaller ◽  
Friedrich Philipp ◽  
Timm Faulwasser ◽  
Karl Worthmann ◽  
Bernhard Maschke
Keyword(s):  
Hamiltonian Systems ◽  
Energy Supply ◽  
Minimal Energy

Aspects of Flow Structure During a Cylinder Wake-Induced Laminar/Turbulent Transition

AIAA Journal ◽  
10.2514/2.613 ◽  
1999 ◽  
Vol 37 (10) ◽  
pp. 1197-1205 ◽  
Author(s):  
N. K. Kyriakides ◽  
E. G. Kastrinakis ◽  
S. G. Nychas ◽  
A. Goulas
Keyword(s):  
Flow Structure ◽  
Cylinder Wake ◽  
Turbulent Transition ◽  
Laminar Turbulent Transition

Minimal energy maneuvering control of a rigid spacecraft with momentum transfer

2007 ◽  
Vol 344 (7) ◽  
pp. 991-1005 ◽  
Author(s):  
Chi-Ching Yang ◽  
Li-Chun Lai ◽  
Chia-Ju Wu
Keyword(s):  
Momentum Transfer ◽  
Minimal Energy ◽  
Rigid Spacecraft

Reduced Order Modeling of a Turbulent Three Dimensional Cylinder Wake

2007 ◽  
Author(s):  
Jürgen Seidel ◽  
Kelly Cohen ◽  
Selin Aradag ◽  
Stefan Siegel ◽  
Thomas McLaughlin
Keyword(s):  
Three Dimensional ◽  
Reduced Order Modeling ◽  
Cylinder Wake ◽  
Reduced Order

scholarly journals Nucleation barriers at corners for a cubic-to-tetragonal phase transformation

2015 ◽  
Vol 145 (4) ◽  
pp. 715-724 ◽  
Author(s):  
Peter Bella ◽  
Michael Goldman
Keyword(s):  
Phase Transformation ◽  
Tetragonal Phase ◽  
Scaling Law ◽  
Energetic Cost ◽  
Minimal Energy ◽  
Physical Experiments ◽  
Domain With A Corner ◽  
Appl Math ◽  
Good Agreement

We are interested in the energetic cost of a martensitic inclusion of volume V in austenite for the cubic-to-tetragonal phase transformation. In contrast with the work of Knüpfer, Kohn and Otto (Commun. Pure Appl. Math.66 (2013), 867–904), we consider a domain with a corner and obtain a better scaling law for the minimal energy (Emin ∼ min(V2/3, V7/9)). Our predictions are in good agreement with physical experiments where nucleation of martensite is usually observed near the corners of the specimen.

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