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 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.

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.

Numerical Simulation Calculation on Spectrum Properties of Ultra Long Period Fiber Grating

2009 ◽  
Vol 36 (3) ◽  
pp. 672-676
Author(s):  
颜爱东 Yan Aidong ◽  
张伟刚 Zhang Weigang ◽  
姜萌 Jiang Meng ◽  
刘卓琳 Liu Zhuolin ◽  
张春艳 Zhang Chunyan ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Simulation Calculation ◽  
Period Fiber Grating

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

Cavitation Performance Study Based on Numerical Simulation of the Magnetic Driving Pump

2010 ◽  
Author(s):  
Fanyu Kong ◽  
Xiaokai Shen ◽  
Xufeng Zhang ◽  
Kuanrong Xue ◽  
Shuiqing Zhou ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Performance Study ◽  
Variable Pitch ◽  
Long Period ◽  
Cavitation Performance ◽  
Hydraulic Design ◽  
Design Requirements ◽  
Pump Inlet ◽  
Flow Head

A new magnetic driving pump with low-NPSHR had been developed to ensure leakage-free for transporting fluid. In hydraulic design, several common measures, according to the equation of cavitation, were applied to lower down the NPSHR of the pump. Moreover, a variable-pitch inducer whose pitch increases gradually was installed at the inlet of impeller. Cavitation performance of the magnetic driving pump and the reasons why the NPSHR was reduced by installing a variable-pitch inducer were analyzed according to the simulation predicted flow field at the pump inlet and inducer. The test of cavitation performance showed that the magnetic driving pump had the excellent cavitation performance, and met the design requirements in flow, head and vibration. The magnetic driving pump presented the reliability after a long period of operation in a petrochemical corporation. Therefore, magnetic driving pumps with low-NPSHR would have a great future in petrochemical, shipping and other important fields.

Numerical Simulation of Deep Drawing Process of Drawing Cylinder Based on Dynaform

2013 ◽  
Vol 816-817 ◽  
pp. 294-297 ◽  
Author(s):  
Sheng Wei Yang
Keyword(s):  
Numerical Simulation ◽  
Design Process ◽  
Production Efficiency ◽  
Simulation Analysis ◽  
Drawing Process ◽  
Empirical Formulas ◽  
Deep Drawing Process ◽  
Long Period ◽  
Traditional Design ◽  
The Cost

In addition to the high cost and long period, the traditional design of the drawing process depends too much on empirical formulas and data. To solve this problem, the paper proposes an ideal design process of the drawing process, which improves the traditional design process bases on CAE and applies FEM software Dynaform. The paper takes a drawing cylinder as an example, which needed 4-stage drawing process, could be improved into 3-stage by the simulation analysis of CAE, as a result , which can reduce the cost and improve the production efficiency.

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