A multi‐time stepping integration method for the ultrasound heating problem
A multi‐time stepping integration method for the ultrasound heating problem
复制标题
超声加热问题的多时间步进积分方法
DOI:
10.1002/zamm.201200023
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
B. Wohlmuth
中科院分区:
文献类型:
--
作者:
I. Shevchenko;M. Kaltenbacher;B. Wohlmuth
A two‐dimensional thermo‐acoustic problem consisting of the Pennes bioheat transfer model and a nonlinear wave equation with a temperature dependent speed of sound is considered. The large discrepancy in time scales of the wave propagation and the heat conduction processes requires a multi‐time stepping method allowing to solve both equations on different time scales. However, the standard approach considers a sequential solution process without any error control. We propose a multi‐time stepping scheme based on a fixed‐point approach resulting in a thermo‐acoustic coupling controlled by a stopping criterion. Furthermore, in most high‐intensity focused ultrasound applications the problem has to deal with absorbing boundary conditions (ABCs) in a bounded region. The use of a Lagrange multiplier based technique allows us to efficiently incorporate the second order Engquist–Majda ABC into the weak formulation of the original problem. The efficiency and robustness of the proposed multi‐time stepping method as well as improved accuracy compared to the widely used standard scheme for modeling high‐intensity focused ultrasound is demonstrated through a series of numerical examples which are typical for ultrasound heating.
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影响因子:
4.7
作者:
R. Astley
通讯作者:
R. Astley
DOI:
10.1243/09544119jeim574
发表时间:
2010-01-01
影响因子:
1.8
作者:
Duck,F.
通讯作者:
Duck,F.
影响因子:
4.1
作者:
BERENGER, JP
通讯作者:
BERENGER, JP
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
C. L. Floch;M. Tanter;M. Fink
通讯作者:
M. Fink
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
M. Kaltenbacher
通讯作者:
M. Kaltenbacher