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#!/usr/bin/env python3
from pathlib import Path
import multiprocessing
import re
import tempfile
import subprocess
import fnmatch
import shutil
import numpy as np
from pyelmer import elmer
import click
from scipy import constants
def enumerate_mesh_bodies(msh_file):
with open(msh_file, 'r') as f:
for line in f:
if line.startswith('$PhysicalNames'):
break
else:
raise ValueError('No physcial bodies found in mesh file.')
_num_names = next(f)
for line in f:
if line.startswith('$EndPhysicalNames'):
break
dim, _, line = line.strip().partition(' ')
tag, _, name = line.partition(' ')
yield name.strip().strip('"'), (int(dim), int(tag))
INPUT_EXT_MAP = {
'.grd': 1,
'.mesh*': 2,
'.ep': 3,
'.ansys': 4,
'.inp': 5,
'.fil': 6,
'.FDNEUT': 7,
'.unv': 8,
'.mphtxt': 9,
'.dat': 10,
'.node': 11,
'.ele': 11,
'.mesh': 12,
'.msh': 14,
'.ep.i': 15,
'.2dm': 16}
OUTPUT_EXT_MAP = {
'.grd': 1,
'.mesh*': 2,
'.ep': 3,
'.msh': 4,
'.vtu': 5}
def elmer_grid(infile, outfile=None, intype=None, outtype=None, cwd=None, **kwargs):
infile = Path(infile)
if outfile is not None:
outfile = Path(outfile)
if intype is None:
intype = str(INPUT_EXT_MAP[infile.suffix])
if outtype is None:
if outfile is not None and outfile.suffix:
outtype = str(OUTPUT_EXT_MAP[outfile.suffix])
else:
outtype = '2'
if outfile is not None:
kwargs['out'] = str(outfile)
args = ['ElmerGrid', intype, outtype, infile]
for key, value in kwargs.items():
args.append(f'-{key}')
if isinstance(value, (tuple, list)):
args.extend(str(v) for v in value)
else:
args.append(str(value))
subprocess.run(args, cwd=cwd)
def elmer_solver(cwd):
subprocess.run(['ElmerSolver'], cwd=cwd)
@click.command()
@click.option('-d', '--sim-dir', type=click.Path(dir_okay=True, file_okay=False, path_type=Path))
@click.argument('mesh_file', type=click.Path(dir_okay=False, path_type=Path))
def run_capacitance_simulation(mesh_file, sim_dir):
physical = dict(enumerate_mesh_bodies(mesh_file))
if sim_dir is not None:
sim_dir = Path(sim_dir)
sim_dir.mkdir(exist_ok=True)
sim = elmer.load_simulation('3D_steady', 'coil_parasitics_sim.yml')
mesh_dir = '.'
mesh_fn = 'mesh'
sim.header['Mesh DB'] = f'"{mesh_dir}" "{mesh_fn}"'
sim.constants.update({
'Permittivity of Vacuum': str(constants.epsilon_0),
'Gravity(4)': f'0 -1 0 {constants.g}',
'Boltzmann Constant': str(constants.Boltzmann),
'Unit Charge': str(constants.elementary_charge)})
air = elmer.load_material('air', sim, 'coil_parasitics_materials.yml')
ro4003c = elmer.load_material('ro4003c', sim, 'coil_parasitics_materials.yml')
solver_electrostatic = elmer.load_solver('Electrostatics_Capacitance', sim, 'coil_parasitics_solvers.yml')
solver_electrostatic.data['Potential Difference'] = '1.0'
eqn = elmer.Equation(sim, 'main', [solver_electrostatic])
bdy_sub = elmer.Body(sim, 'substrate', [physical['substrate'][1]])
bdy_sub.material = ro4003c
bdy_sub.equation = eqn
bdy_ab = elmer.Body(sim, 'airbox', [physical['airbox'][1]])
bdy_ab.material = air
bdy_ab.equation = eqn
# boundaries
for name, identity in physical.items():
if (m := re.fullmatch(r'trace([0-9]+)', name)):
num = int(m.group(1))
bndry_m2 = elmer.Boundary(sim, name, [identity[1]])
bndry_m2.data['Capacitance Body'] = str(num)
boundary_airbox = elmer.Boundary(sim, 'FarField', [physical['airbox_surface'][1]])
boundary_airbox.data['Electric Infinity BC'] = 'True'
with tempfile.TemporaryDirectory() as tmpdir:
if sim_dir:
tmpdir = str(sim_dir)
sim.write_startinfo(tmpdir)
sim.write_sif(tmpdir)
# Convert mesh from gmsh to elemer formats. Also scale it from 1 unit = 1 mm to 1 unit = 1 m (SI units)
elmer_grid(mesh_file.name, 'mesh', cwd=tmpdir, scale=[1e-3, 1e-3, 1e-3])
elmer_solver(tmpdir)
capacitance_matrix = np.loadtxt(tmpdir / 'capacitance.txt')
@click.command()
@click.option('-d', '--sim-dir', type=click.Path(dir_okay=True, file_okay=False, path_type=Path))
@click.argument('mesh_file', type=click.Path(dir_okay=False, path_type=Path))
def run_inductance_simulation(mesh_file, sim_dir):
physical = dict(enumerate_mesh_bodies(mesh_file))
if sim_dir is not None:
sim_dir = Path(sim_dir)
sim_dir.mkdir(exist_ok=True)
sim = elmer.load_simulation('3D_steady', 'coil_mag_sim.yml')
mesh_dir = '.'
mesh_fn = 'mesh'
sim.header['Mesh DB'] = f'"{mesh_dir}" "{mesh_fn}"'
sim.constants.update({
'Permittivity of Vacuum': str(constants.epsilon_0),
'Gravity(4)': f'0 -1 0 {constants.g}',
'Boltzmann Constant': str(constants.Boltzmann),
'Unit Charge': str(constants.elementary_charge)})
air = elmer.load_material('air', sim, 'coil_mag_materials.yml')
ro4003c = elmer.load_material('ro4003c', sim, 'coil_mag_materials.yml')
copper = elmer.load_material('copper', sim, 'coil_mag_materials.yml')
solver_current = elmer.load_solver('Static_Current_Conduction', sim, 'coil_mag_solvers.yml')
solver_magdyn = elmer.load_solver('Magneto_Dynamics', sim, 'coil_mag_solvers.yml')
solver_magdyn_calc = elmer.load_solver('Magneto_Dynamics_Calculations', sim, 'coil_mag_solvers.yml')
copper_eqn = elmer.Equation(sim, 'copperEqn', [solver_current, solver_magdyn, solver_magdyn_calc])
air_eqn = elmer.Equation(sim, 'airEqn', [solver_magdyn, solver_magdyn_calc])
bdy_trace = elmer.Body(sim, 'trace', [physical['trace'][1]])
bdy_trace.material = copper
bdy_trace.equation = copper_eqn
bdy_sub = elmer.Body(sim, 'substrate', [physical['substrate'][1]])
bdy_sub.material = ro4003c
bdy_sub.equation = air_eqn
bdy_ab = elmer.Body(sim, 'airbox', [physical['airbox'][1]])
bdy_ab.material = air
bdy_ab.equation = air_eqn
bdy_if_top = elmer.Body(sim, 'interface_top', [physical['interface_top'][1]])
bdy_if_top.material = copper
bdy_if_top.equation = copper_eqn
bdy_if_bottom = elmer.Body(sim, 'interface_bottom', [physical['interface_bottom'][1]])
bdy_if_bottom.material = copper
bdy_if_bottom.equation = copper_eqn
# boundaries
boundary_airbox = elmer.Boundary(sim, 'FarField', [physical['airbox_surface'][1]])
boundary_airbox.data['Electric Infinity BC'] = 'True'
boundary_vplus = elmer.Boundary(sim, 'Vplus', [physical['interface_top'][1]])
boundary_vplus.data['Potential'] = 1.0
boundary_vplus.data['Save Scalars'] = True
boundary_vminus = elmer.Boundary(sim, 'Vminus', [physical['interface_bottom'][1]])
boundary_vminus.data['Potential'] = 0.0
with tempfile.TemporaryDirectory() as tmpdir:
if sim_dir:
tmpdir = str(sim_dir)
sim.write_startinfo(tmpdir)
sim.write_sif(tmpdir)
# Convert mesh from gmsh to elemer formats. Also scale it from 1 unit = 1 mm to 1 unit = 1 m (SI units)
elmer_grid(mesh_file.name, 'mesh', cwd=tmpdir, scale=[1e-3, 1e-3, 1e-3])
elmer_solver(tmpdir)
if __name__ == '__main__':
run_inductance_simulation()
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