Study of field distribution, acoustical efficiency and harmonic generation for pseudo-interdigital surface-wave transducers by a finite-difference method

Ultrasonics ◽  
1976 ◽  
Vol 14 (2) ◽  
pp. 57-64 ◽  
Author(s):  
A. Defebvre ◽  
P. Desplanques ◽  
J.L. Vaterkowski
Keyword(s):  
Surface Wave ◽  
Finite Difference ◽  
Finite Difference Method ◽  
Field Distribution ◽  
Harmonic Generation ◽  
Difference Method

scholarly journals Particle Tracking Random Simulation of Pollutant Migration and Diffusion

2021 ◽  
Vol 257 ◽  
pp. 03049
Author(s):  
Zhehua Du ◽  
Xin Lin
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Field Distribution ◽  
Particle Tracking ◽  
Difference Method ◽  
Convective Diffusion ◽  
Fluid Velocity ◽  
Particle Tracing ◽  
Particle Tracking Method ◽  
Tracing Method

A two-step Lagrangian particle tracing method was used to simulate the particle movement in convective diffusion. Firstly, the flow field distribution was given by finite difference method. Secondly convective diffusion was simulated by particle tracing method. Jet current through centre slit in the static flow and turbulent flow as well as the side discharge of pollutant were simulated as case study. In this paper, finite difference method is used to solve fluid velocity field distribution, and particle tracking method is used to solve convection-diffusion equation. The result shows that the data produced by particle tracing method is reasonable and the method is stable. This method can be applied to the calculation of the convective diffusion of pollutant and spread to other problems.

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