Use FFT for MAC projection cases #152
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For level 0 MAC projection with all periodic boundaries or periodic in the first two dimensions and Neumann in the last dimension, there is now the option of using FFT. To compile with FFT support, use `USE_FFT=TRUE` for GNU Make and `HYDRO_FFT=ON` (which will turn on AMReX_FFT) for CMake. At runtime, one needs to specify `mac_proj.use_fft = 1`. If the conditions for FFT support are not satisfied, a runtime error may occur. So don't set `mac_proj.use_fft=1` unless FFT is supported for the problem. Note that the current implementation is still experimental.
asalmgren
approved these changes
Oct 21, 2024
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For level 0 MAC projection with all periodic boundaries or periodic in the first two dimensions and Neumann in the last dimension, there is now the option of using FFT. To compile with FFT support, use
USE_FFT=TRUEfor GNU Make andHYDRO_FFT=ON(which will turn on AMReX_FFT) for CMake. At runtime, one needs to specifymac_proj.use_fft = 1. If the conditions for FFT support are not satisfied, a runtime error may occur. So don't setmac_proj.use_fft=1unless FFT is supported for the problem.Note that the current implementation is still experimental.