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Biot-JKD model: simulation of 1D transient poroelastic waves with fractional derivatives

Abstract : A time-domain numerical modeling of Biot poroelastic waves is presented. The viscous dissipation occurring in the pores is described using the dynamic permeability model developed by Johnson-Koplik-Dashen (JKD). Some of the coefficients in the Biot-JKD model are proportional to the square root of the frequency: in the time-domain, these coefficients introduce order 1/2 shifted fractional derivatives involving a convolution product. Based on a diffusive representation, the convolution kernel is replaced by a finite number of memory variables that satisfy local-in-time ordinary differential equations. Thanks to the dispersion relation, the coefficients in the diffusive representation are obtained by performing an optimization procedure in the frequency range of interest. A splitting strategy is then applied numerically: the propagative part of Biot-JKD equations is discretized using a fourth-order ADER scheme on a Cartesian grid, whereas the diffusive part is solved exactly. Comparisons with analytical solutions show the efficiency and the accuracy of this approach.
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Contributor : Bruno Lombard Connect in order to contact the contributor
Submitted on : Tuesday, December 11, 2012 - 4:24:41 PM
Last modification on : Thursday, November 4, 2021 - 2:44:03 PM
Long-term archiving on: : Tuesday, March 12, 2013 - 10:25:35 AM


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Emilie Blanc, Guillaume Chiavassa, Bruno Lombard. Biot-JKD model: simulation of 1D transient poroelastic waves with fractional derivatives. Journal of Computational Physics, 2013, 237, pp.1-20. ⟨10.1016/⟩. ⟨hal-00713127v2⟩



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