sarkas.tools.observables.DiffusionFlux

class sarkas.tools.observables.DiffusionFlux

Diffusion Fluxes and their Auto-correlation functions.

The \(\alpha\) diffusion flux \(\mathbf J_{\alpha}(t)\) is calculated from eq.~(3.5) in [Zhou and Miller, 1996] which reads

\[\mathbf J_{\alpha}(t) = \frac{m_{\alpha}}{m_{\rm tot} } \sum_{\beta = 1}^{M} \left ( m_{\rm tot} \delta_{\alpha\beta} - x_{\alpha} m_{\beta} \right ) \mathbf j_{\beta} (t)\]

where \(M\) is the total number of species, \(m_{\rm tot} = \sum_{i}^M m_{i}\) is the total mass of the system, \(x_{\alpha} = N_{\alpha} / N_{\rm tot}\) is the concentration of species \(\alpha\), and

\[\mathbf j_{\alpha}(t) = \sum_{i = 1}^{N_{\alpha}} \mathbf v_{i}(t)\]

is the microscopic velocity field of species \(\alpha\).

Methods

DiffusionFlux.__init__()
DiffusionFlux.calc_k_data()	Calculate and save Fourier space data.
DiffusionFlux.calc_kt_data([nkt_flag, vkt_flag])	Calculate Time dependent Fourier space quantities.
DiffusionFlux.compute()	Calculate the observable (and its autocorrelation function).
DiffusionFlux.create_dirs_filenames()
DiffusionFlux.from_dict(input_dict)	Update attributes from input dictionary.
DiffusionFlux.grab_sim_data([pva])	Read in particles data
DiffusionFlux.parse()	Grab the pandas dataframe from the saved csv file.
DiffusionFlux.parse_k_data()	Read in the precomputed Fourier space data.
DiffusionFlux.parse_kt_data([nkt_flag, vkt_flag])	Read in the precomputed time dependent Fourier space data.
DiffusionFlux.plot([scaling, acf, figname, show])	Plot the observable by calling the pandas.DataFrame.plot() function and save the figure.
DiffusionFlux.pretty_print()	Print observable parameters for help in choice of simulation parameters.
DiffusionFlux.read_pickle()	Read the observable's info from the pickle file.
DiffusionFlux.save_hdf()
DiffusionFlux.save_pickle()	Save the observable's info into a pickle file.
DiffusionFlux.setup(params[, phase, no_slices])	Assign attributes from simulation's parameters.
DiffusionFlux.setup_init(params[, phase, ...])	Assign Observables attributes and copy the simulation's parameters.
DiffusionFlux.setup_multirun_dirs()	Set the attributes postprocessing_dir and dump_dirs_list.
DiffusionFlux.time_stamp(message, timing)	Print to screen the elapsed time of the calculation.
DiffusionFlux.update_args(**kwargs)	Update observable specific attributes and call update_finish() to save info.
DiffusionFlux.update_finish()	Update the slice_steps, CCF's and DSF's attributes, and save pickle file with observable's info.