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#!/usr/bin/env python3
#
# --- Input file for binary Coulomb collision testing. This input script
# --- runs the same test as inputs_2d but via Python, therefore the input
# --- values where directly copied from inputs_2d.
from pywarpx import picmi
constants = picmi.constants
#################################
####### GENERAL PARAMETERS ######
#################################
max_steps = 150
max_grid_size = 8
max_level = 0
nx = max_grid_size
ny = max_grid_size
xmin = 0
xmax = 4.154046151855669e2
ymin = xmin
ymax = xmax
plasma_density = 1e21
elec_rms_velocity = 0.044237441120300*constants.c
ion_rms_velocity = 0.006256118919701*constants.c
number_per_cell = 200
#################################
############ NUMERICS ###########
#################################
serialize_initial_conditions = 1
verbose = 1
cfl = 1.0
# Order of particle shape factors
particle_shape = 1
#################################
############ PLASMA #############
#################################
elec_dist = picmi.UniformDistribution(
density=plasma_density,
rms_velocity=[elec_rms_velocity]*3,
directed_velocity=[elec_rms_velocity, 0., 0.]
)
ion_dist = picmi.UniformDistribution(
density=plasma_density,
rms_velocity=[ion_rms_velocity]*3,
)
electrons = picmi.Species(
particle_type='electron', name='electron',
warpx_do_not_deposit=1,
initial_distribution=elec_dist,
)
ions = picmi.Species(
particle_type='H',
name='ion', charge='q_e',
mass="5*m_e",
warpx_do_not_deposit=1,
initial_distribution=ion_dist
)
#################################
########## COLLISIONS ###########
#################################
collision1 = picmi.CoulombCollisions(
name='collisions1',
species=[electrons, ions],
CoulombLog=15.9
)
collision2 = picmi.CoulombCollisions(
name='collisions2',
species=[electrons, electrons],
CoulombLog=15.9
)
collision3 = picmi.CoulombCollisions(
name='collisions3',
species=[ions, ions],
CoulombLog=15.9
)
#################################
###### GRID AND SOLVER ##########
#################################
grid = picmi.Cartesian2DGrid(
number_of_cells=[nx, ny],
warpx_max_grid_size=max_grid_size,
warpx_blocking_factor=max_grid_size,
lower_bound=[xmin, ymin],
upper_bound=[xmax, ymax],
lower_boundary_conditions=['periodic', 'periodic'],
upper_boundary_conditions=['periodic', 'periodic'],
)
solver = picmi.ElectromagneticSolver(grid=grid, cfl=cfl)
#################################
######### DIAGNOSTICS ###########
#################################
field_diag = picmi.FieldDiagnostic(
name='diag1',
grid=grid,
period=10,
data_list=[],
write_dir='.',
warpx_file_prefix='Python_collisionXZ_plt'
)
#################################
####### SIMULATION SETUP ########
#################################
sim = picmi.Simulation(
solver=solver,
max_steps=max_steps,
verbose=verbose,
warpx_serialize_initial_conditions=serialize_initial_conditions,
warpx_collisions=[collision1, collision2, collision3]
)
sim.add_species(
electrons,
layout=picmi.PseudoRandomLayout(
n_macroparticles_per_cell=number_per_cell, grid=grid
)
)
sim.add_species(
ions,
layout=picmi.PseudoRandomLayout(
n_macroparticles_per_cell=number_per_cell, grid=grid
)
)
sim.add_diagnostic(field_diag)
#################################
##### SIMULATION EXECUTION ######
#################################
#sim.write_input_file('PICMI_inputs_2d')
sim.step(max_steps)
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