Add strang implicit spectral em redo #5027
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dpgrote
added
component: spectral
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| import sys | ||
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| import numpy as np | ||
| import yt |
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| import numpy as np | ||
| import yt | ||
| from scipy.constants import e, epsilon_0 |
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| /** | ||
| * \brief Time-biasing parameter for fields used on RHS to advance system | ||
| */ | ||
| amrex::Real m_theta = 0.5; |
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@dpgrote Is m_theta used?
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I've removed references to theta.
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This implements use of the PSATD field advance coupled with the implicit solver, using a Strang split advance.
This requires the input parameter psatd.update_with_rho = 0.
With psatd.periodic_single_box_fft = 1, exact energy conservation is obtained. Otherwise good conservation is seen, but not exact (will depend on parameters).
Convergence is found for wpedt <= 1.9 (compared to wpedt < 0.25 for FDTD).
This PR replaces PR #4662.
A task for a future PR would be to implement specialized source free spectral advance routines (as noted in source comments).