scholarly journals Numerical simulation of droplets, bubbles and waves: state of the art

2009 ◽  
Vol 41 (6) ◽  
pp. 065001 ◽  
Author(s):  
Daniel Fuster ◽  
Gilou Agbaglah ◽  
Christophe Josserand ◽  
Stéphane Popinet ◽  
Stéphane Zaleski
Keyword(s):  
Numerical Simulation ◽  
State Of The Art

Calandria Tube to Tubesheet Roller-Expanded Joint Qualification

2006 ◽  
Author(s):  
A. S. Banwatt ◽  
R. G. Sauve´
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Hoop Stress ◽  
State Of The Art ◽  
Nuclear Reactors ◽  
Test Rig ◽  
Support Design ◽  
Reactor Configuration ◽  
Reactor Assembly

The complex calandria tube to calandria tubesheet roller-expanded joint in CANDU nuclear reactors is usually qualified by test. In this paper, a state-of-the-art numerical simulation is undertaken in order to improve the understanding of the behaviour of the joint to support design modifications and provide assurance that the test rig envelopes behaviour of the in-situ reactor assembly. Parameters such as hoop stress, and plastic deformation of the assembly are predicted. The analysis results are also compared with the available test data and in-situ experimental data. The analysis results show that the test performed to qualify the joint using a small plate and single joint is representative of the in-situ reactor configuration.

High Rayleigh Number Flows in a Cubical Enclosure

2005 ◽  
Author(s):  
Lucas Vargas ◽  
Ikram Ahmed ◽  
David N. Koert
Keyword(s):  
Numerical Simulation ◽  
Rayleigh Number ◽  
Prandtl Number ◽  
Turbulent Flows ◽  
State Of The Art ◽  
Transition To Turbulence ◽  
Computing Technology ◽  
Chaotic Flows ◽  
Convective Flows ◽  
Cubical Enclosure

High Rayleigh number (Ra) natural convective flows in cubical enclosures were investigated using Direct Numerical Simulation (DNS). Here the bottom of the cavity was heated while the top was cooled, each maintained at a different constant temperature, with the sidewalls insulated. The Prandtl number was maintained at 2.5 and the Ra varied between 106 and 108. In order to observe the transition to turbulence with increasing Ra, power spectrum slopes were compared with Kolmogorov’s −5/3 rule for turbulent flows. At the higher Ra studied, the flows showed characteristics typically attributed to “chaotic” flows. However, the transition to full turbulence was not observed, which is expected around Ra ∼ 109 and may not be predicted using DNS with the state-of-the-art computing technology.

scholarly journals State-Of-The-Art Methods for the Numerical Simulation of Aortic BMHVs

Aortic Valve ◽  
10.5772/22718 ◽  
2011 ◽  
Author(s):  
Sebastiaan Annerel ◽  
Tom Claessens ◽  
Peter Van ◽  
Patrick Segers ◽  
Pascal Verdonck ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
State Of The Art ◽  
Art Methods

scholarly journals Special Issue: Resilience and Sustainability of Civil Infrastructures under Extreme Loads

2019 ◽  
Vol 11 (12) ◽  
pp. 3292 ◽  
Author(s):  
Zheng Lu ◽  
Ying Zhou ◽  
Tony Yang ◽  
Angeliki Papalou
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Seismic Performance ◽  
State Of The Art ◽  
Engineering Application ◽  
Special Issue ◽  
Civil Structures ◽  
Civil Infrastructures ◽  
Extreme Loads ◽  
Near Future

The special issue entitled ‘‘Resilience and Sustainability of Civil Infrastructures under Extreme Loads’’ updates the state of the art and perspectives focused on cutting-edge approaches to enhance structures’ resilience and sustainability under extreme loading events, including theoretical investigation, numerical simulation, and experimental study, keeping an eye on the seismic performance of civil structures. Notably, some innovative energy dissipative devices and resilient structural forms, which are encompassed in this special issue, would provide valuable references for the engineering application of resilient and sustainable civil infrastructures in the near future.

scholarly journals Numerical simulation of non-neutral forest canopy flows at a site in North-Eastern France

2017 ◽  
Author(s):  
Cian J. Desmond ◽  
Simon J. Watson ◽  
Christiane Montavon ◽  
Jimmy Murphy
Keyword(s):  
Fluid Dynamics ◽  
Numerical Simulation ◽  
Computational Fluid Dynamics ◽  
Forest Canopy ◽  
State Of The Art ◽  
Canopy Density ◽  
North Eastern ◽  
Canopy Flows ◽  
A Site ◽  
Neutral Conditions

Abstract. The flow over densely forested terrain under neutral and non-neutral conditions is considered using commercially available Computational Fluid Dynamics software. Results are validated against data from a site in North-Eastern France. It is shown that the effects of both neutral and stable atmospheric stratifications can be modelled numerically using state of the art methodologies whilst unstable stratifications are more difficult to simulate accurately. The sensitivity of the numerical model to parameters such as canopy height, canopy density and the turbulence modelling constant Cμ is also assessed.

scholarly journals Benchmarking state-of-the-art numerical simulation techniques for analyzing large photonic crystal membrane line defect cavities

2018 ◽  
Author(s):  
Niels Gregersen ◽  
Jakob Rosenkrantz de Lasson ◽  
Lars Hagedorn Frandsen ◽  
Philipp Gutsche ◽  
Sven Burger ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Photonic Crystal ◽  
State Of The Art ◽  
Line Defect ◽  
Simulation Techniques ◽  
Photonic Crystal Membrane
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