Non‐Markovian activated rate processes: Comparison of current theories with numerical simulation data

1986 ◽  
Vol 84 (3) ◽  
pp. 1788-1794 ◽  
Author(s):  
John E. Straub ◽  
Michal Borkovec ◽  
Bruce J. Berne
Keyword(s):  
Numerical Simulation ◽  
Simulation Data ◽  
Rate Processes

Numerical Simulation Study on High-Temperature Ventilated Cavitating Flow Considering the Compressibility of Gases

2012 ◽  
Vol 569 ◽  
pp. 395-399
Author(s):  
Jing Zhao ◽  
Guo Yu Wang ◽  
Yan Zhao ◽  
Yue Ju Liu
Keyword(s):  
Numerical Simulation ◽  
State Equation ◽  
Field Structure ◽  
Cavitating Flow ◽  
Simulation Approach ◽  
Gas Velocity ◽  
Simulation Data ◽  
Ventilated Cavity ◽  
Supercavitating Flow ◽  
Fluctuation Range

A numerical simulation approach of ventilated cavity considering the compressibility of gases is established in this paper, introducing the gas state equation into the calculation of ventilated supercavitating flow. Based on the comparison of computing results and experimental data, we analyzes the differences between ventilated cavitating flow fields with and without considered the compressibility of gases. The effect of ventilation on the ventilated supercavitating flow field structure is discussed considering the compressibility of gases. The results show that the simulation data of cavity form and resistance, which takes the compressibility of gases into account, accord well with the experimental ones. With the raising of ventilation temperature, the gas fraction in the front cavity and the gas velocity in the cavity increase, and the cavity becomes flat. The resistance becomes lower at high ventilation temperature, but its fluctuation range becomes larger than that at low temperature.

An Optimum-Curved Die-Profile for Investment Casting of Turbo Blades

2011 ◽  
Vol 314-316 ◽  
pp. 630-633
Author(s):  
Yi Wei Dong ◽  
Ding Hua Zhang ◽  
Kun Bu ◽  
Yang Qing Dou
Keyword(s):  
Numerical Simulation ◽  
Investment Casting ◽  
Geometric Parameters ◽  
Iteration Algorithm ◽  
Inverse Iteration ◽  
Simulation Data ◽  
Parameterized Modeling ◽  
Dimension Precision ◽  
Die Profile ◽  
The Mean

In order to avoid tremendous modifications of the die cavity for investment casting of turbo blades, this paper proposed an inverse iterative compensation method that adjusts certain geometric parameters to establish the die-profile. The parameterized modeling is achieved by identifying geometric parameters describing the mean camber line; the optimum-curve die-profile can be obtained based on the inverse iteration algorithm. As a result, the dimension precision of turbo blades can be guaranteed. The applicability of this method is validated using numerical simulation data.

SERS polarization-dependent effects for an ordered 3D plasmonic tilted silver nanorod array

Nanoscale ◽  
2018 ◽  
Vol 10 (17) ◽  
pp. 8106-8114 ◽  
Author(s):  
Renxian Gao ◽  
Yongjun Zhang ◽  
Fan Zhang ◽  
Shuang Guo ◽  
Yaxin Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Nanorod Array ◽  
Polarization Dependence ◽  
Nanorod Arrays ◽  
Simulation Data ◽  
Hexagonal Close Packed

Hexagonal close-packed tilted Ag nanorod arrays that exhibit excellent uniformity and reproducibility were prepared. The polarization dependence of SERS of nanorod array is fundamentally explained by integrating the experimental and theoretical numerical simulation data.

Sloshing and Swirling in Partially Loaded Prismatic Chamfered Tanks

2017 ◽  
Author(s):  
Gustavo M. Karuka ◽  
Makoto Arai ◽  
Hideyuki Ando
Keyword(s):  
Numerical Simulation ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Pressure Distribution ◽  
Natural Frequency ◽  
Difference Method ◽  
Simulation Data ◽  
Tank Model ◽  
Breadth Ratio ◽  
Sloshing Pressure

In this study a sloshing experiment using a partially filled membrane tank model was carried out and compared with numerical simulation. The pressure was measured at 10 points and a load cell measured the longitudinal and transversal forces, under regular and irregular excitation. A 3D finite difference method based solver was used for the numerical simulation. When the prismatic tank length to breadth ratio is near 1, swirling, i.e., liquid free surface’s rotating motion in the tank might occur when the tank is excited near its natural frequency, especially for medium and low tank filling levels. According to the experimental and simulation data, the magnitude of the forces and impact pressures in this situation can be significant and therefore cannot be neglected. Tank designs might use different length to breadth ratios (Lt/Bt) depending on the ship size and number of tanks, so the problem is worth being investigated. The Lt/Bt and the occurrence of swirling was then investigated. The pressure distribution when the swirling occurs is then compared with the 1st mode sloshing pressure distribution, and considerations about the tank safety are inferred.

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