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FDTD

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Journal Article
Journal: Geophysics
Published: 22 June 2012
Geophysics (2012) 77 (4): H45-H55.
...) the execution of measurements and the initialization of the inversion by defining a subsurface model and a set of parameters to be estimated; (2) a forward model consisting of a finite-difference time-domain (FDTD) solver of the 2D Maxwell equations, which simulates the measurement; (3) a feature-detection...
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Journal Article
Published: 01 June 2011
Journal of Environmental and Engineering Geophysics (2011) 16 (2): 61-71.
... time domain (FDTD) numerical model and assuming zero-offset profiling mode of acquisition. The ray-based inverse models were shown to reproduce the original electromagnetic wave velocity of the numerical model. A second test was also run using FDTD modeling, where an infiltrating wetting front moves...
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Journal Article
Journal: Geophysics
Published: 23 May 2007
Geophysics (2007) 72 (4): H43-H53.
...Arash JafarGandomi; Hiroshi Takenaka Abstract We propose an efficient algorithm for modeling seismic plane-wave propagation in vertically heterogeneous viscoelastic media using a finite-difference time-domain (FDTD) technique. In the algorithm, the wave equation is rewritten for plane waves...
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Journal Article
Journal: Geophysics
Published: 25 January 2007
Geophysics (2007) 72 (2): T9-T17.
...Francis H. Drossaert; Antonios Giannopoulos Abstract In finite-difference time-domain (FDTD) modeling of elastic waves, absorbing boundary conditions are used to mitigate undesired reflections that can arise at the model's truncation boundaries. The perfectly matched layer (PML) is generally...
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Journal Article
Journal: Geophysics
Published: 01 January 2007
Geophysics (2007) 72 (6): Y7.
...Arash Jafar-Gandomi; Hiroshi Takenaka Following is a link to the correct code: http://software.seg.org/2007/0005 . “Efficient FDTD algorithm for plane-wave simulation for vertically heterogeneous attenuative media,” Arash Jafar-Gandomi and Hiroshi Takenaka , G EOPHYSICS , 72, no. 4, H43...
Journal Article
Journal: Geophysics
Published: 01 January 2003
Geophysics (2003) 68 (5): 1731-1743.
... that cause significant changes in the wave propagation characteristics in a borehole. The 3D cylindrical problem with both radial and azimuthal heterogeneities is suitable for numerical solutions of the wave equations by finite-difference time-domain (FDTD) and pseudospectral time-domain (PSTD) methods...
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Journal Article
Journal: Geophysics
Published: 01 October 1999
Geophysics (1999) 64 (5): 1369-1377.
...Tim Bergmann; Joakim O. Blanch; Johan O. A. Robertsson; Klaus Holliger Abstract The Lax-Wendroff correction is an elegant method for increasing the accuracy and computational efficiency of finite-difference time-domain (FDTD) solutions of hyperbolic problems. However, the conventional approach...
Journal Article
Journal: Geophysics
Published: 01 August 1997
Geophysics (1997) 62 (4): 1114-1126.
... numerical techniques. The finite-difference time-domain (FDTD) technique implements finite-difference approximations of Maxwell's equations in a discretized volume that permit accurate computation of the radiated field from a transmitting antenna, propagation through the air-earth interface, scattering...
Journal Article
Journal: Geophysics
Published: 01 February 1996
Geophysics (1996) 61 (1): 110-120.
Journal Article
Journal: Geophysics
Published: 01 August 1995
Geophysics (1995) 60 (4): 1265-1269.
Journal Article
Journal: Geophysics
Published: 13 June 2017
Geophysics (2017) 82 (4): T183-T196.
...Jeffrey Shragge; Benjamin Tapley ABSTRACT Generating accurate numerical solutions of the acoustic wave equation (AWE) is a key computational kernel for many seismic imaging and inversion problems. Although finite-difference time-domain (FDTD) approaches for generating full-wavefield solutions...
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Journal Article
Journal: Geophysics
Published: 26 May 2015
Geophysics (2015) 80 (4): E213-E224.
...Haohuan Fu; Yingqiao Wang; Evan Schankee Um; Jiarui Fang; Tengpeng Wei; Xiaomeng Huang; Guangwen Yang ABSTRACT The finite-difference time-domain (FDTD) method has been widely used to perform transient electromagnetic simulation. Compared to the traditional FDTD method, the finite-element time...
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Journal Article
Journal: Geophysics
Published: 04 March 2015
Geophysics (2015) 80 (2): E147-E162.
... of earth-modeling algorithms that consider EM responses from steel-cased boreholes use integral-equation methods. To be able to model complex casing scenarios, we revisited the finite-difference time-domain (FDTD) method to advance the modeling of transient-EM field responses from steel-cased boreholes...
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Journal Article
Journal: Geophysics
Published: 11 November 2014
Geophysics (2014) 79 (6): T363-T378.
...Jeffrey Shragge ABSTRACT The key computational kernel of most advanced 3D seismic imaging and inversion algorithms used in exploration seismology involves calculating solutions of the 3D acoustic wave equation, most commonly with a finite-difference time-domain (FDTD) methodology. Although well...
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Image
Comparison between the physical-scale model test results and 3D <b>FDTD</b> soluti...
in > Geophysics
Published: 13 February 2019
Figure 7. Comparison between the physical-scale model test results and 3D FDTD solutions with (a) different distances from the underground water-filled cave to the tunnel face, (b) different water-filled cave radii, and (c) different water-filled cave thicknesses.
Image
The 3D <b>FDTD</b> solutions (left) and the amplified TEM response curves (right) ...
in > Geophysics
Published: 13 February 2019
Figure 8. The 3D FDTD solutions (left) and the amplified TEM response curves (right) with (a) different distances from the tunnel face to the object, (b) different radii of the spheroidal object, and (c) different thicknesses of the spheroidal object.
Image
The TEM response curves of the <b>FDTD</b> forward calculation with     R  =  20  ...
in > Geophysics
Published: 13 February 2019
Figure 10. The TEM response curves of the FDTD forward calculation with R = 20    m , D = 20    m , and T = 20    m and R = 40    m , D = 40    m , and T = 40    m .
Image
Eigenvalues of the discrete update matrix     A     for standard <b>FDTD</b>. (a) ...
in > Geophysics
Published: 24 October 2018
Figure 1. Eigenvalues of the discrete update matrix A for standard FDTD. (a) The eigenvalues with a time step of Δ t = 0.5    ms . (b) The eigenvalues with a time step of Δ t = 1.5    ms . (c) The eigenvalues with a time step of Δ t = 2    ms . The red
Image
a) Synthetic radargram generated using the <b>FDTD</b> model of  Irving and Knight...
Published: 18 September 2018
Figure 5.  a) Synthetic radargram generated using the FDTD model of Irving and Knight (2006) showing picked reflection events and fit from inverted three layer model; b) Velocity-depth structure result of ray-tracing iterative inversion and Dix estimation on radargram in (a). “Known” line
Image
Calculation results contrast of multi-scale <b>FDTD</b> and competition solutions:...
Published: 18 September 2018
Figure 2.  Calculation results contrast of multi-scale FDTD and competition solutions: a) response curves from multi-scale FDTD and analytical solution; b) apparent resistivity contrast of multi-scale FDTD and analytical solution; and c) response curve contrast of multi-scale FDTD, integral