scholarly journals Numerical Simulation of Long-Period Oscillation in a Branching Bay of Koshiki Islands

2008 ◽  
Vol 55 ◽  
pp. 216-220 ◽  
Author(s):  
Tomohiro SHIRAHASHI ◽  
Taro KAKINUMA ◽  
Toshiyuki ASANO ◽  
Michio SATO
Keyword(s):  
Numerical Simulation ◽  
Long Period ◽  
Period Oscillation

scholarly journals Development of Depth-Limited Wave Boundary Layers over a Smooth Bottom

2020 ◽  
Vol 9 (1) ◽  
pp. 27
Author(s):  
Hitoshi Tanaka ◽  
Nguyen Xuan Tinh ◽  
Xiping Yu ◽  
Guangwei Liu
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Boundary Layers ◽  
Wave Motion ◽  
Numerical Study ◽  
Experiment Data ◽  
Tidal Motion ◽  
Long Period ◽  
Simulation Results ◽  
Wave Boundary

A theoretical and numerical study is carried out to investigate the transformation of the wave boundary layer from non-depth-limited (wave-like boundary layer) to depth-limited one (current-like boundary layer) over a smooth bottom. A long period of wave motion is not sufficient to induce depth-limited properties, although it has simply been assumed in various situations under long waves, such as tsunami and tidal currents. Four criteria are obtained theoretically for recognizing the inception of the depth-limited condition under waves. To validate the theoretical criteria, numerical simulation results using a turbulence model as well as laboratory experiment data are employed. In addition, typical field situations induced by tidal motion and tsunami are discussed to show the usefulness of the proposed criteria.

scholarly journals AN ESTIMATION OF LONG-PERIOD OSCILATIONS OF MOORED SHIP BY NUMERICAL SIMULATION

2002 ◽  
Vol 18 ◽  
pp. 137-142 ◽  
Author(s):  
Satoru SHIRAISHI ◽  
Haruo YONEYAMA ◽  
Hirakazu SATO ◽  
Kenji SASA
Keyword(s):  
Numerical Simulation ◽  
Long Period

scholarly journals Changes in the strength and width of the Hadley Circulation since 1871

2012 ◽  
Vol 8 (4) ◽  
pp. 1169-1175 ◽  
Author(s):  
J. Liu ◽  
M. Song ◽  
Y. Hu ◽  
X. Ren
Keyword(s):  
20Th Century ◽  
Global Climate ◽  
Hadley Circulation ◽  
Recent Change ◽  
Early 20Th Century ◽  
Greenhouse Warming ◽  
Long Period ◽  
The Past ◽  
Period Oscillation

Abstract. Recent studies demonstrate that the Hadley Circulation has intensified and expanded for the past three decades, which has important implications for subtropical societies and may lead to profound changes in global climate. However, the robustness of this intensification and expansion that should be considered when interpreting long-term changes of the Hadley Circulation is still a matter of debate. It also remains largely unknown how the Hadley Circulation has evolved over longer periods. Here, we present long-term variability of the Hadley Circulation using the 20th Century Reanalysis. It shows a slight strengthening and widening of the Hadley Circulation since the late 1970s, which is not inconsistent with recent assessments. However, over centennial timescales (1871–2008), the Hadley Circulation shows a tendency towards a more intense and narrower state. More importantly, the width of the Hadley Circulation might have not yet completed a life-cycle since 1871. The strength and width of the Hadley Circulation during the late 19th to early 20th century show strong natural variability, exceeding variability that coincides with global warming in recent decades. These findings raise the question of whether the recent change in the Hadley Circulation is primarily attributed to greenhouse warming or to a long-period oscillation of the Hadley Circulation – substantially longer than that observed in previous studies.

Analytical and Calibration Models for Slot Antennas

2019 ◽  
pp. 57-100
Author(s):  
Kok Yeow You
Keyword(s):  
Numerical Simulation ◽  
Analytical Calculation ◽  
Computation Time ◽  
Systematic Errors ◽  
Simulation Software ◽  
Slot Antenna ◽  
Slot Antennas ◽  
Long Period ◽  
Calibration Models ◽  
Calibration Methods

In this chapter, the background, analytical formulations, and calibration routines for slot antennas are briefly reviewed. Performance and operating frequency of the slot antenna are strongly dependent on the dimension and shape of the slot or slotted array on the antenna. Nowadays, most antennas are designed using numerical simulation software for accuracy in analysis. However, analytical formulations still play an important role in the pre-design of the antenna due to the numerical simulation which still requires relatively long period of computation time compared to the analytical calculation. The predicted dimension of the antenna from analytical calculations will only require minor adjustment to optimize its performance in numerical simulation. Hence, the time spent for the antenna design can be shortened. Besides the performance of antenna, the antenna calibration process is crucial as well for releasing systematic errors in the antenna measurements. Some one-port calibration methods are described in detail.

scholarly journals THE EFFECT OF LONG PERIOD OSCILLATION IN THE STORM SURGE

2002 ◽  
Vol 18 ◽  
pp. 125-130
Author(s):  
Hiroshi YOSHIOKA ◽  
Shigeatsu SERIZAWA ◽  
Tomotsuka TAKAYAMA
Keyword(s):  
Storm Surge ◽  
Long Period ◽  
Period Oscillation

Field Observations and Analyses of Long-Period Oscillation in Harbours and Bays

1983 ◽  
Vol 26 (1) ◽  
pp. 39-50 ◽  
Author(s):  
Naoto Yamada ◽  
Shuji Yamamoto ◽  
Yasuhiro Hosokawa
Keyword(s):  
Field Observations ◽  
Long Period ◽  
Period Oscillation
Sign in / Sign up

Export Citation Format

Share Document