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Numerical Simulation of ESWL with Single-pulse and Dual-pulse Based on 2D Unstructured Grid CE/SE Method

Xiaoyan Z., Jingqiu C., Yongxiang Z., Chunxia W.

Przegląd Elektrotechniczny

2012

R. 88, nr 3b

48-53

This research focused on the pressure of the single-pulse and dual-pulse of ESWL (Extracorporeal Shock Wave Lithotripsy). And both results were compared and analyzed. Based on the 2D axisymmetric Euler equations and hybrid grids improved CE / SE numerical scheme, the pressure field was simulated in the case of water is the pressure transmission medium. Using the pressure field of shock wave lithotripsy simulated, single-pulse and dual-pulse pressure values near the focus were compared. A Great negative pressure was occurred after the positive pressure near the focus. Furthermore, dual-pulse pressure was about twice of the single-pulse near the focus. The simulation results provided a reliable numerical simulation result for the design and application of ESWL lithotripter.

Badano możliwości jedno- i dwupulsowej litotrypsji (techniki rozbijania kamienia nerkowego). Przedstawiono model matematyczny w wodzie jako medium przenoszenia ciśnienia.

Simulation of water flow in double-porosity soils on unstructured grids with the finite-volume method

Szymkiewicz A., Burzyński K.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2007

Vol. 11, No 4

397-410

Double-porosity soils consist of two interacting porous systems corresponding to weakly conductive aggregates and highly conductive inter-aggregate regions. The flow of water in such media can be described with a two-scale model obtained by homogenization. The model consists of a single macroscopic equation for the flow in the highly conductive porous system coupled with a number of micro-scale equations for the flow in the weakly conductive aggregates. In this paper we present a numerical algorithm to solve the resulting system of equations for the case of macroscopically two-dimensional flow. It is based on the finite volume approach for unstructured grid of triangular cells. Special attention is paid to the coupling of the micro- and macro-scale equations. An exemplary calculation is presented, concerning infiltration and redistribution of water in a hill-slope of double-porosity structure with cubic aggregates.