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Identification of thermophysical parameters using an artificial immune system

Dziatkiewicz Jolanta, Poteralski Arkadiusz

Computer Assisted Methods in Engineering and Science

2023

Vol. 30, no. 4

521--537

In this paper, the identification of thermophysical parameters using the hyperbolic twotemperature model is made. We investigate the influence of ultra-fast laser pulses on the heating of a thin metal film using this model. Two differential equations coupled with the electron-phonon coupling factor G are used. One of these equations concerns electron temperatures and the other addresses lattice temperatures. Appropriate initial and boundary conditions are imposed for this model. The finite difference method with a staggered grid is used to solve this direct problem. Temperatures for even nodes and heat fluxes for odd nodes are calculated. The results of the direct problem and results of the experiment are compared. In the optimization process, an artificial immune system is used.

Analysis of ultrashort laser pulse interactions with metal films using a two-temperature model

Majchrzak E., Dziatkiewicz J.

Journal of Applied Mathematics and Computational Mechanics

2015

Vol. 14, nr 2

31--39

In the paper the problem of thin metal film subjected to the action of the high laser fluence and the ultrashort pulse width is considered. The mathematical model consists of the equations describing the electrons and phonons temperatures and the relationships between the heat fluxes and temperature gradients of electrons and phonons. The problem is solved using the explicit scheme of the finite difference method with staggered grid. In the final part the results of computations and conclusions are presented.