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Merge pull request #41 from ExCALIBUR-NEPTUNE/tom/momentum_diagnostics
Tom/momentum diagnostics
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| &control | ||
| problem = 'two_stream_neutral' | ||
| / |
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| #!/usr/bin/env python3 | ||
| import sys | ||
| import argparse | ||
| import matplotlib.pyplot as plt | ||
| import numpy as np | ||
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| def parse_arguments(): | ||
| """Parse command line options. | ||
| """ | ||
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| parser = argparse.ArgumentParser( | ||
| description="""Momentum conservation analysis for minEPOCH | ||
| """, | ||
| formatter_class=argparse.ArgumentDefaultsHelpFormatter, | ||
| ) | ||
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| group = parser.add_argument_group("Tolerances") | ||
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| group.add_argument( | ||
| "--momentum_conservation", | ||
| default=1e-4, | ||
| type=float, | ||
| help="Allowed fractional error in momentum conservation", | ||
| nargs="?", | ||
| ) | ||
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| parser.add_argument("--disable_plots", help="Disable plot generation", | ||
| action="store_true") | ||
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| return parser.parse_args() | ||
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| def get_momenta(fname='Data/momentum.dat'): | ||
| """Calculate time history of field and particle momentum for an output file. | ||
| Args: | ||
| fname: Input filename. Default: Data/momentum.dat | ||
| Returns: | ||
| times, particle_momentum, field_momentum | ||
| """ | ||
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| times = [] | ||
| field_momenta = [] | ||
| particle_momenta = [] | ||
| with open(fname) as f: | ||
| # Skip header | ||
| _ = f.readline() | ||
| for line in f: | ||
| times.append(line.split()[1]) | ||
| particle_momenta.append(line.split()[2:5]) | ||
| field_momenta.append(line.split()[5:]) | ||
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| times = np.array(times, dtype=float) | ||
| particle_momenta = np.array(particle_momenta, dtype=float) | ||
| field_momenta = np.array(field_momenta, dtype=float) | ||
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| return times, particle_momenta, field_momenta | ||
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| def momentum_check(fname='Data/momentum.dat', tolerance=None, label=None, | ||
| plot=True, savefig=False, signedplot=True): | ||
| """Check quality of momentum conservation from minEPOCH simulation | ||
| Args: | ||
| fname: Input filename. Default: Data/momentum.dat | ||
| tolerance: Maximum acceptable fractional error. Default: None (no check) | ||
| label: Label for data set when plotting. Default: None | ||
| plot: Control optional plotting. Default: True | ||
| savefig: Control saving of figure. Default: False | ||
| signedplot: Plot +/- errors, or just absolute values. Default: True | ||
| """ | ||
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| # Calculate total energy as a function of time | ||
| times, pp, fp = get_momenta(fname) | ||
| total_p = np.sum((pp + fp)**2, axis=1) # Magnitude as a function of time | ||
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| # If plotting requested produce plot of energy conservation error as | ||
| # a function of time | ||
| if plot: | ||
| if signedplot: | ||
| data = total_p - total_p[0] | ||
| else: | ||
| data = np.abs(total_p - total_p[0]) | ||
| plt.plot(times, data / total_p[0], label=label) | ||
| plt.xlabel(r'$\mathrm{t (s)}$', fontsize=16) | ||
| plt.ylabel(r'$\frac{\Delta |P|}{|P|(t=0)}$', fontsize=16) | ||
| plt.xlim(left=times[0]) | ||
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| # Update legend if necessary | ||
| if label is not None: | ||
| plt.legend() | ||
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| plt.tight_layout() | ||
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| if savefig: | ||
| plt.savefig('momentum_conservation.png') | ||
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| # If tolerance provided, check final energy conservation error | ||
| if tolerance is not None: | ||
| delta_p = np.abs(total_p[-1] - total_p[0]) / total_p[0] | ||
| if delta_p > tolerance: | ||
| print('Momentum conservation (fractional) error = %.4E' % delta_p) | ||
| return 1 | ||
| return 0 | ||
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| return None | ||
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| if __name__ == "__main__": | ||
| # Parse arguments | ||
| options = parse_arguments() | ||
| # Run error analysis | ||
| sys.exit(momentum_check(tolerance=options.momentum_conservation, | ||
| plot=not options.disable_plots, | ||
| savefig=True)) |
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