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tamaas/python/tamaas/__main__.py
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__main__.py
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#!/usr/bin/env python3
# -*- mode: python; coding: utf-8 -*-
# vim: set ft=python:
import sys
import io
import time
import argparse
import tamaas as tm
import numpy as np
__author__ = "Lucas Frérot"
__copyright__ = (
"Copyright (©) 2019-2021, EPFL (École Polytechnique Fédérale de Lausanne),"
"\nLaboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)"
)
__license__ = "AGPL"
__email__ = "lucas.frerot@gmail.com"
def load_stream(stream):
"""
Load numpy from binary stream (allows piping)
Code from
https://gist.github.com/CMCDragonkai/3c99fd4aabc8278b9e17f50494fcc30a
"""
np_magic = stream.read(6)
# use the sys.stdin.buffer to read binary data
np_data = stream.read()
# read it all into an io.BytesIO object
return io.BytesIO(np_magic + np_data)
def surface(args):
if args.generator == 'random_phase':
generator = tm.SurfaceGeneratorRandomPhase2D(args.sizes)
elif args.generator == 'filter':
generator = tm.SurfaceGeneratorFilter2D(args.sizes)
else:
raise ValueError('Unknown generator method {}'.format(args.generator))
generator.spectrum = tm.Isopowerlaw2D()
generator.spectrum.q0 = args.cutoffs[0]
generator.spectrum.q1 = args.cutoffs[1]
generator.spectrum.q2 = args.cutoffs[2]
generator.spectrum.hurst = args.hurst
generator.random_seed = args.seed
surface = generator.buildSurface() / generator.spectrum.rmsSlopes() \
* args.rms
output = args.output if args.output is not None else sys.stdout
np.savetxt(output, surface)
def contact(args):
from tamaas.dumpers import NumpyDumper
tm.set_log_level(tm.LogLevel.error)
if not args.input:
input = sys.stdin
else:
input = args.input
surface = np.loadtxt(input)
discretization = surface.shape
system_size = [1., 1.]
model = tm.ModelFactory.createModel(tm.model_type.basic_2d,
system_size, discretization)
solver = tm.PolonskyKeerRey(model, surface, args.tol)
solver.solve(args.load)
dumper = NumpyDumper('numpy', 'traction', 'displacement')
dumper.dump_to_file(sys.stdout.buffer, model)
def plot(args):
import matplotlib.pyplot as plt
fig, (ax_traction, ax_displacement) = plt.subplots(1, 2)
ax_traction.set_title('Traction')
ax_displacement.set_title('Displacement')
with load_stream(sys.stdin.buffer) as f_np:
data = np.load(f_np)
ax_traction.imshow(data['traction'])
ax_displacement.imshow(data['displacement'])
fig.set_size_inches(10, 6)
fig.tight_layout()
plt.show()
def main():
parser = argparse.ArgumentParser(
prog='tamaas',
description=("tm.py is a simple utility script for surface generation and,"
" elastic contact computation and plotting of contact"
" solutions"),
)
subs = parser.add_subparsers(title='commands',
description='utility commands')
# Arguments for surface command
parser_surface = subs.add_parser(
'surface', description='Generate a self-affine rough surface')
parser_surface.add_argument("--cutoffs", "-K",
nargs=3,
type=int,
help="Long, rolloff and short wavelength cutoffs",
metavar=('k_l', 'k_r', 'k_s'),
required=True)
parser_surface.add_argument("--sizes",
nargs=2,
type=int,
help="Number of points",
metavar=('nx', 'ny'),
required=True)
parser_surface.add_argument("--hurst", "-H",
type=float,
help="Hurst exponent",
required=True)
parser_surface.add_argument("--rms",
type=float,
help="Root-mean-square of slopes",
default=1.)
parser_surface.add_argument("--seed",
type=int,
help="Random seed",
default=int(time.time()))
parser_surface.add_argument("--generator",
help="Generation method",
choices=('random_phase', 'filter'),
default='random_phase')
parser_surface.add_argument("--output", "-o",
help="Output file name (compressed if .gz)")
parser_surface.set_defaults(func=surface)
# Arguments for contact command
parser_contact = subs.add_parser(
'contact',
description="Compute the elastic contact solution with a given surface")
parser_contact.add_argument("--input", "-i",
help="Rough surface file (default read from stdin)")
parser_contact.add_argument("--tol",
type=float,
default=1e-12,
help="Solver tolerance")
parser_contact.add_argument("load",
type=float,
help="Applied average pressure")
parser_contact.set_defaults(func=contact)
# Arguments for plot command
parser_plot = subs.add_parser(
'plot', description='Plot contact solution')
parser_plot.set_defaults(func=plot)
args = parser.parse_args()
try:
args.func(args)
except AttributeError:
parser.print_usage()
if __name__ == '__main__':
main()
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