3D Time-domain electromagnetic full waveform inversion in Debye dispersive medium accelerated by multi-GPU paralleling

Jian Deng , Yves Rogez (1) , Peimin Zhu , Alain Herique (1) , Jinpeng Jiang , Wlodek Kofman (1)

1 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble

Electromagnetic full waveform inversion in Debye dispersive medium (EFWI-D) is a promising technique to reconstruct the inner structure and electrical properties of the medium such as soil, rock and biological tissues. Same as conventional full waveform inversion, EFWI-D requires high computational cost, especially in the 3D case. To reduce the long computation time, we design and implement the EFWI-D algorithm in time domain using multiple GPU cards. The inversion method is based on the L-BFGS optimization algorithm, which can increase the convergence of the misfit function, while the auxiliary differential equation (ADE) method is employed for modeling the Debye dispersive medium by using exponential time differencing (ETD) finite-difference time-domain (FDTD) approach. Moreover, a multi-stream strategy is performed in the workflow to improve the computation performance. Numerical results illustrate the improvement of the computational performance and the preliminarily feasibility of the proposed inversion algorithm.

Mots clés: Full waveform inversion (FWI); GPU paralleling; Debye dispersive medium; Electromagnetic tomography

Domaines: Planète et Univers [physics]

Jian Deng, Yves Rogez, Peimin Zhu, Alain Herique, Jinpeng Jiang, et al.. 3D Time-domain electromagnetic full waveform inversion in Debye dispersive medium accelerated by multi-GPU paralleling. Computer Physics Communications, 2021, 265, ⟨10.1016/j.cpc.2021.108002⟩. ⟨insu-03705287⟩