examples/terminal_velocities.ipynb

{
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  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "127e14e8",
   "metadata": {},
   "outputs": [],
   "source": [
    "from PySDM import Builder\n",
    "from PySDM.backends import CPU\n",
    "from PySDM.physics import si\n",
    "from PySDM.environments import Box\n",
    "import numpy as np\n",
    "from matplotlib import pyplot\n",
    "from open_atmos_jupyter_utils import show_plot"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "e98bc23f",
   "metadata": {},
   "outputs": [],
   "source": [
    "volumes = np.linspace(.01 * si.um**3, 1 * si.um**3, num=100)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "ad975357",
   "metadata": {},
   "outputs": [],
   "source": [
    "builder = Builder(n_sd=100, backend=CPU())\n",
    "builder.set_environment(Box(dt=np.nan, dv=np.nan))\n",
    "builder.request_attribute('terminal velocity')\n",
    "particulator = builder.build(attributes={'n': np.ones_like(volumes), 'volume': volumes})"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "c8a54ad2",
   "metadata": {},
   "outputs": [],
   "source": [
    "v_term = particulator.attributes['terminal velocity'].to_ndarray()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "ed9ca429",
   "metadata": {},
   "outputs": [
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    "pyplot.plot(volumes / si.um**3, v_term / (si.mm / si.s))\n",
    "pyplot.xlabel(r'volume [$\\mu m^3$]')\n",
    "pyplot.ylabel(r'terminal velocity [$mm/s$]')\n",
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    "show_plot('terminal_velocities.pdf')"
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