Experimental investigation and numerical simulation of the spatio-temporal evolution of the laser pulses in Q-switched Nd:YAG-lasers

2003 ◽  
Author(s):  
G. Anstett ◽  
M. Nittmann ◽  
R. Wallenstein
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Temporal Evolution ◽  
Laser Pulses ◽  
Nd:Yag Lasers ◽  
Spatio Temporal

Experimental investigation and numerical simulation of the spatio-temporal dynamics of nanosecond pulses in Q-switched Nd:YAG lasers

2003 ◽  
Vol 76 (8) ◽  
pp. 833-838 ◽  
Author(s):  
G. Anstett ◽  
M. Nittmann ◽  
A. Borsutzky ◽  
R. Wallenstein
Keyword(s):  
Numerical Simulation ◽  
Experimental Investigation ◽  
Temporal Dynamics ◽  
Nd:Yag Lasers ◽  
Nanosecond Pulses ◽  
Spatio Temporal

scholarly journals The Spatio-Temporal Evolution of River Island Based on Landsat Satellite Imagery, Hydrodynamic Numerical Simulation and Observed Data

2018 ◽  
Vol 10 (12) ◽  
pp. 2046 ◽  
Author(s):  
Haiyun Shi ◽  
Yuhan Cao ◽  
Changming Dong ◽  
Changshui Xia ◽  
Chunhui Li
Keyword(s):  
Numerical Simulation ◽  
Temporal Evolution ◽  
Thematic Mapper ◽  
Sediment Discharge ◽  
Natural Factor ◽  
River Islands ◽  
Island Evolution ◽  
Spatio Temporal ◽  
Landsat Satellite ◽  
Changing Rate

A river island is a shaped sediment accumulation body with its top above the water’s surface in crooked or branching streams. In this paper, four river islands in Yangzhong City in the lower reaches of the Yangtze River were studied. The spatio-temporal evolution information of the islands was quantitatively extracted using the threshold value method, binarization model, and cluster analysis, based on Thematic Mapper (TM) and Enhanced Thematic Mapper+ (ETM+) images of the Landsat satellite series from 1985 to 2015. The variation mechanism and influencing factors were analyzed using an unstructured-grid, Finite-Volume Coastal Ocean Model (FVCOM) hydrodynamic numerical simulation, as well as the water-sediment data measured by hydrological stations. The annual average total area of these islands was 251,224.46 m2 during 1985–2015, and the total area first increased during 1985–2000 and decreased later during 2000–2015. Generally, the total area increased during these 30 years. Taipingzhou island had the largest area and the biggest changing rate, Xishadao island had the smallest area, and Zhongxinsha island had the smallest changing rate. The river islands’ area change was influenced by river runoff, sediment discharge, and precipitation, and sediment discharge proved to be the most significant natural factor in island evolution. River island evolution was also found to be affected by both runoff and oceanic tide. The difference in flow-field caused silting up in the Leigongdao Island and the head of Taipingzhou Island, and a serious reduction in the middle and tail of Taipingzhou Island. The method used in this paper has good applicability to river islands in other rivers around the world.

scholarly journals Direct numerical simulation of intermittent turbulence under stably stratified conditions

2015 ◽  
Vol 2 (1) ◽  
pp. 179-241 ◽  
Author(s):  
P. He ◽  
S. Basu
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Flows ◽  
Open Channel ◽  
Temporal Evolution ◽  
Intermittent Turbulence ◽  
Bursting Events ◽  
Spatio Temporal ◽  
Channel Region ◽  
Laminar And Turbulent Flows

Abstract. In this paper, we simulate intermittent turbulence (also known as bursting events) in stably stratified open-channel flows using direct numerical simulation. Clear signatures of this intriguing phenomenon are observed for a range of stabilities. However, the spatio-temporal characteristics of intermittency are found to be strongly stability-dependent. In general, the bursting events are much more frequent near the bottom wall than in the upper-channel region. A steady coexistence of laminar and turbulent flows is detected at various horizontal planes in very stable cases. This spatially intermittent pattern is found to propagate downstream and strongly correlate with the temporal evolution of intermittency. Last, a long standing hypothesis by Blackadar, i.e., the strong connection between local stability and intermittent turbulence, is corroborated by this modeling study.

Experimental investigation on failure process and spatio-temporal evolution of rockburst in granite with a prefabricated circular hole

2020 ◽  
Vol 27 (10) ◽  
pp. 2930-2944
Author(s):  
Chong-yan Liu ◽  
Guang-ming Zhao ◽  
Wen-song Xu ◽  
Xiang-rui Meng ◽  
Shun-jie Huang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Circular Hole ◽  
Temporal Evolution ◽  
Failure Process ◽  
Spatio Temporal

Direct numerical simulation of turbulent flow around a wall-mounted cube: spatio-temporal evolution of large-scale vortices

2006 ◽  
Vol 566 ◽  
pp. 1 ◽  
Author(s):  
ALEXANDER YAKHOT ◽  
TOMER ANOR ◽  
HEPING LIU ◽  
NIKOLAY NIKITIN
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Turbulent Flow ◽  
Large Scale ◽  
Temporal Evolution ◽  
Spatio Temporal

Spatio-temporal evolution of femtosecond laser pulses in dielectric multi-layers controlling the damage behavior

2021 ◽  
Author(s):  
Matthias Lenzner ◽  
Amir Khabbazi Oskouei ◽  
Luke A. Emmert ◽  
Marco Jupé ◽  
Thomas Willemsen ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Temporal Evolution ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Damage Behavior ◽  
Spatio Temporal

scholarly journals Generation and Spatio-Temporal Evolution of Optical Vortices in Femtosecond Laser Pulses

2007 ◽  
Vol 127 (9) ◽  
pp. 1308-1313
Author(s):  
Yasunori Toda ◽  
Koshi Nagaoka ◽  
Katsuhiro Shimatake ◽  
Ryuji Morita
Keyword(s):  
Femtosecond Laser ◽  
Temporal Evolution ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Optical Vortices ◽  
Spatio Temporal
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