Application of the boundary element method numerical simulations for characterization of heptode ultramicroelectrodes in SECM experiments

2003 ◽  
Vol 49 (1) ◽  
pp. 117-128 ◽  
Author(s):  
Oleg Sklyar ◽  
Joachim Ufheil ◽  
Jürgen Heinze ◽  
Gunther Wittstock
Keyword(s):  
Boundary Element Method ◽  
Numerical Simulations ◽  
Boundary Element ◽  
Element Method

The Optimum Design of a Cavitator for High-Speed Axisymmetric Bodies in Partially Cavitating Flows

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
I. Rashidi ◽  
Mo. Passandideh-Fard ◽  
Ma. Pasandideh-Fard
Keyword(s):  
Boundary Element Method ◽  
Numerical Simulations ◽  
Drag Coefficient ◽  
Boundary Element ◽  
Cavitation Number ◽  
The Body ◽  
Total Drag ◽  
Conical Section ◽  
Disk Cavitator ◽  
Element Method

In this paper, the partially cavitating flow over an axisymmetric projectile is studied in order to obtain the optimum cavitator such that, at a given cavitation number, the total drag coefficient of the projectile is minimum. For this purpose, the boundary element method and numerical simulations are used. A large number of cavitator profiles are produced using a parabolic expression with three geometric parameters. The potential flow around these cavitators is then solved using the boundary element method. In order to examine the optimization results, several cavitators with a total drag coefficient close to that of the optimum cavitators are also numerically simulated. Eventually, the optimum cavitator is selected using both the boundary element method and numerical simulations. The effects of the body radius and the length of the conical section of the projectile on the shape of the optimized cavitator are also investigated. The results show that for all cavitation numbers, the cavitator that creates a cavity covering the entire conical section of the projectile with a minimum total drag coefficient is optimal. It can be seen that increasing the cavitation number causes the optimum cavitator to approach the disk cavitator. The results also show that at a fixed cavitation number, the increase in both the radius and length of the conical section causes the cavitator shape to approach that of the disk cavitator.

BEHAVIOR OF OSCILLATING BUBBLES NEAR ELASTIC MEMBRANES: AN EXPERIMENTAL AND NUMERICAL STUDY

2005 ◽  
Vol 19 (28n29) ◽  
pp. 1579-1582 ◽  
Author(s):  
GEOK PEI ONG ◽  
BOO CHEONG KHOO ◽  
CARY TURANGAN ◽  
EVERT KLASEBOER ◽  
SIEW WAN FONG
Keyword(s):  
Boundary Element Method ◽  
Numerical Simulations ◽  
Boundary Element ◽  
Numerical Study ◽  
Spark Discharge ◽  
Thin Membrane ◽  
Profound Influence ◽  
Oscillating Bubbles ◽  
Elastic Membranes ◽  
Element Method

Experimental observations and numerical simulations (based on the boundary element method) concerning an oscillating bubble near a flexible (thin) membrane are presented in this paper. The bubbles are created using an underwater electrical spark discharge. It is shown that the presence of a membrane can have a profound influence on the behavior of a bubble.

A BOUNDARY-ELEMENT METHOD FOR ATOMIZATION OF A FINITE LIQUID JET

1995 ◽  
Vol 5 (6) ◽  
pp. 621-638 ◽  
Author(s):  
J. H. Hilbing ◽  
Stephen D. Heister ◽  
C. A. Spangler
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Liquid Jet ◽  
Element Method
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