fluidsim/test.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "b3a161b7",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "*************************************\n",
      "Program fluidsim\n",
      "sim:                <class 'fluidsim.solvers.ns2d.solver.Simul'>\n",
      "sim.output:         <class 'fluidsim.solvers.ns2d.output.Output'>\n",
      "sim.oper:           <class 'fluidsim.operators.operators2d.OperatorsPseudoSpectral2D'>\n",
      "sim.state:          <class 'fluidsim.solvers.ns2d.state.StateNS2D'>\n",
      "sim.time_stepping:  <class 'fluidsim.base.time_stepping.pseudo_spect.TimeSteppingPseudoSpectral'>\n",
      "sim.init_fields:    <class 'fluidsim.solvers.ns2d.init_fields.InitFieldsNS2D'>\n",
      "\n",
      "solver NS2D, RK4 and sequential,\n",
      "type fft: fluidfft.fft2d.with_pyfftw\n",
      "nx =    128 ; ny =    128\n",
      "lx = 2pi ; ly = 2pi\n",
      "path_run =\n",
      "/root/Sim_data/NS2D_128x128_S2pix2pi_2026-01-08_21-59-30\n",
      "init_fields.type: dipole\n",
      "\n",
      "Initialization outputs:\n",
      "sim.output.increments:             <class 'fluidsim.base.output.increments.Increments'>\n",
      "sim.output.phys_fields:            <class 'fluidsim.base.output.phys_fields2d.PhysFieldsBase2D'>\n",
      "sim.output.spatial_means:          <class 'fluidsim.solvers.ns2d.output.spatial_means.SpatialMeansNS2D'>\n",
      "sim.output.spatiotemporal_spectra: <class 'fluidsim.solvers.ns2d.output.spatiotemporal_spectra.SpatioTemporalSpectraNS2D'>\n",
      "sim.output.spect_energy_budg:      <class 'fluidsim.solvers.ns2d.output.spect_energy_budget.SpectralEnergyBudgetNS2D'>\n",
      "sim.output.spectra:                <class 'fluidsim.solvers.ns2d.output.spectra.SpectraNS2D'>\n",
      "sim.output.spectra_multidim:       <class 'fluidsim.solvers.ns2d.output.spectra_multidim.SpectraMultiDimNS2D'>\n",
      "sim.output.temporal_spectra:       <class 'fluidsim.base.output.temporal_spectra.TemporalSpectra2D'>\n",
      "\n",
      "Memory usage at the end of init. (equiv. seq.): 255.63671875 Mo\n",
      "Size of state_spect (equiv. seq.): 0.13312 Mo\n",
      "*************************************\n",
      "Beginning of the computation\n",
      "save state_phys in file state_phys_t0000.000.nc\n",
      "    compute until t =         10\n",
      "it =      0 ; t =            0 ; deltat  =   0.031996\n",
      "              energy = 9.578e-02 ; Delta energy = +0.000e+00\n",
      "\n",
      "MEMORY_USAGE:                  255.83984375 Mo\n",
      "save state_phys in file state_phys_t0000.512.nc\n",
      "save state_phys in file state_phys_t0001.025.nc\n",
      "save state_phys in file state_phys_t0001.519.nc\n",
      "save state_phys in file state_phys_t0002.026.nc\n",
      "save state_phys in file state_phys_t0002.514.nc\n",
      "save state_phys in file state_phys_t0003.017.nc\n",
      "save state_phys in file state_phys_t0003.529.nc\n",
      "save state_phys in file state_phys_t0004.013.nc\n",
      "save state_phys in file state_phys_t0004.506.nc\n",
      "save state_phys in file state_phys_t0005.003.nc\n",
      "save state_phys in file state_phys_t0005.507.nc\n",
      "save state_phys in file state_phys_t0006.011.nc\n",
      "save state_phys in file state_phys_t0006.515.nc\n",
      "save state_phys in file state_phys_t0007.018.nc\n",
      "save state_phys in file state_phys_t0007.522.nc\n",
      "save state_phys in file state_phys_t0008.020.nc\n",
      "save state_phys in file state_phys_t0008.514.nc\n",
      "save state_phys in file state_phys_t0009.004.nc\n",
      "save state_phys in file state_phys_t0009.526.nc\n",
      "save state_phys in file state_phys_t0010.010.nc\n",
      "Computation completed in  0.49902 s\n",
      "path_run =\n",
      "/root/Sim_data/NS2D_128x128_S2pix2pi_2026-01-08_21-59-30\n",
      "✅ Simulation terminée avec succès.\n"
     ]
    }
   ],
   "source": [
    "import fluidsim as fls\n",
    "from fluidsim.solvers.ns2d.solver import Simul\n",
    "import numpy as np\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "# 1. Créer les paramètres avec la méthode recommandée\n",
    "params = Simul.create_default_params()\n",
    "\n",
    "# 2. Configurer le domaine et la discrétisation\n",
    "params.oper.Lx = 2 * np.pi\n",
    "params.oper.Ly = 2 * np.pi\n",
    "params.oper.nx = 128\n",
    "params.oper.ny = 128\n",
    "\n",
    "# 3. Définir la VISCOSITÉ (méthode correcte)\n",
    "# Pour de la viscosité standard (Laplacien), utiliser nu_2\n",
    "params.nu_2 = 1e-3  # Viscosité de type Laplacien (∇²)\n",
    "\n",
    "# Alternative : pour de l'hyperviscosité d'ordre 4 (∇⁴)\n",
    "# params.nu_4 = 1e-10  \n",
    "\n",
    "# 4. Conditions initiales\n",
    "params.init_fields.type = 'dipole'\n",
    "\n",
    "# 5. Configuration du temps\n",
    "params.time_stepping.deltat0 = 0.01\n",
    "params.time_stepping.t_end = 10.0\n",
    "\n",
    "# 6. Configuration des sorties\n",
    "params.output.periods_print.print_stdout = 100\n",
    "params.output.periods_save.phys_fields = 0.5\n",
    "\n",
    "# 7. Instancier et lancer le simulateur\n",
    "sim = Simul(params)\n",
    "sim.time_stepping.start()\n",
    "\n",
    "print(\"✅ Simulation terminée avec succès.\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8b15545c",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "*************************************\n",
      "Program fluidsim\n",
      "sim:                <class 'fluidsim.solvers.ns2d.solver.Simul'>\n",
      "sim.output:         <class 'fluidsim.solvers.ns2d.output.Output'>\n",
      "sim.oper:           <class 'fluidsim.operators.operators2d.OperatorsPseudoSpectral2D'>\n",
      "sim.state:          <class 'fluidsim.solvers.ns2d.state.StateNS2D'>\n",
      "sim.time_stepping:  <class 'fluidsim.base.time_stepping.pseudo_spect.TimeSteppingPseudoSpectral'>\n",
      "sim.init_fields:    <class 'fluidsim.solvers.ns2d.init_fields.InitFieldsNS2D'>\n",
      "\n",
      "solver NS2D, RK4 and sequential,\n",
      "type fft: fluidfft.fft2d.with_pyfftw\n",
      "nx =      4 ; ny =      4\n",
      "lx = 2pi ; ly = 2pi\n",
      "path_run =\n",
      "/root/Sim_data/NS2D_128x128_S2pix2pi_2026-01-08_21-59-30\n",
      "init_fields.type: constant\n",
      "\n",
      "Initialization outputs:\n",
      "sim.output.increments:             <class 'fluidsim.base.output.increments.Increments'>\n",
      "sim.output.phys_fields:            <class 'fluidsim.base.output.phys_fields2d.PhysFieldsBase2D'>\n",
      "sim.output.spatial_means:          <class 'fluidsim.solvers.ns2d.output.spatial_means.SpatialMeansNS2D'>\n",
      "sim.output.spatiotemporal_spectra: <class 'fluidsim.solvers.ns2d.output.spatiotemporal_spectra.SpatioTemporalSpectraNS2D'>\n",
      "sim.output.spect_energy_budg:      <class 'fluidsim.solvers.ns2d.output.spect_energy_budget.SpectralEnergyBudgetNS2D'>\n",
      "sim.output.spectra:                <class 'fluidsim.solvers.ns2d.output.spectra.SpectraNS2D'>\n",
      "sim.output.spectra_multidim:       <class 'fluidsim.solvers.ns2d.output.spectra_multidim.SpectraMultiDimNS2D'>\n",
      "sim.output.temporal_spectra:       <class 'fluidsim.base.output.temporal_spectra.TemporalSpectra2D'>\n",
      "\n",
      "Memory usage at the end of init. (equiv. seq.): 258.70703125 Mo\n",
      "Size of state_spect (equiv. seq.): 0.000192 Mo\n"
     ]
    },
    {
     "ename": "AttributeError",
     "evalue": "'PhysFieldsBase2D' object has no attribute 'times'",
     "output_type": "error",
     "traceback": [
      "\u001b[31m---------------------------------------------------------------------------\u001b[39m",
      "\u001b[31mAttributeError\u001b[39m                            Traceback (most recent call last)",
      "\u001b[36mCell\u001b[39m\u001b[36m \u001b[39m\u001b[32mIn[13]\u001b[39m\u001b[32m, line 11\u001b[39m\n\u001b[32m      8\u001b[39m \u001b[38;5;66;03m# 1. ACCÈS AUX CHAMPS PHYSIQUES (corrigé)\u001b[39;00m\n\u001b[32m      9\u001b[39m \u001b[38;5;28;01mif\u001b[39;00m \u001b[38;5;28mhasattr\u001b[39m(sim_results.output, \u001b[33m'\u001b[39m\u001b[33mphys_fields\u001b[39m\u001b[33m'\u001b[39m):\n\u001b[32m     10\u001b[39m     \u001b[38;5;66;03m# Vérifier les temps disponibles\u001b[39;00m\n\u001b[32m---> \u001b[39m\u001b[32m11\u001b[39m     times = \u001b[43msim_results\u001b[49m\u001b[43m.\u001b[49m\u001b[43moutput\u001b[49m\u001b[43m.\u001b[49m\u001b[43mphys_fields\u001b[49m\u001b[43m.\u001b[49m\u001b[43mtimes\u001b[49m\n\u001b[32m     12\u001b[39m     \u001b[38;5;28mprint\u001b[39m(\u001b[33mf\u001b[39m\u001b[33m\"\u001b[39m\u001b[33mTemps sauvegardés: \u001b[39m\u001b[38;5;132;01m{\u001b[39;00mtimes\u001b[38;5;132;01m}\u001b[39;00m\u001b[33m\"\u001b[39m)\n\u001b[32m     14\u001b[39m     \u001b[38;5;28;01mif\u001b[39;00m \u001b[38;5;28mlen\u001b[39m(times) > \u001b[32m0\u001b[39m:\n\u001b[32m     15\u001b[39m         \u001b[38;5;66;03m# Dernière sauvegarde\u001b[39;00m\n",
      "\u001b[31mAttributeError\u001b[39m: 'PhysFieldsBase2D' object has no attribute 'times'"
     ]
    }
   ],
   "source": [
    "from fluidsim import load\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "# Charger la simulation complète (meilleure pour l'analyse)\n",
    "sim_results = load(sim.output.path_run)\n",
    "\n",
    "# Vérifier ce qui est disponible\n",
    "print(\"Attributs disponibles dans sim_results.output:\")\n",
    "for attr in dir(sim_results.output):\n",
    "    if not attr.startswith('_'):\n",
    "        print(f\"  {attr}\")\n",
    "\n",
    "# Accéder aux données de plusieurs manières\n",
    "if hasattr(sim_results.output, 'phys_fields'):\n",
    "    # 1. Obtenir les temps disponibles\n",
    "    times = sim_results.output.phys_fields.times\n",
    "    print(f\"\\nTemps sauvegardés: {times}\")\n",
    "    \n",
    "    # 2. Charger un champ à un temps spécifique\n",
    "    if len(times) > 0:\n",
    "        # Dernier temps\n",
    "        t_index = -1\n",
    "        ux = sim_results.output.phys_fields.get_var('ux', t_index)\n",
    "        uy = sim_results.output.phys_fields.get_var('uy', t_index)\n",
    "        \n",
    "        # 3. Calculer le module de vitesse\n",
    "        velocity_magnitude = np.sqrt(ux**2 + uy**2)\n",
    "        \n",
    "        # Visualisation\n",
    "        fig, axes = plt.subplots(1, 3, figsize=(15, 4))\n",
    "        \n",
    "        im1 = axes[0].imshow(ux, cmap='RdBu_r', origin='lower')\n",
    "        plt.colorbar(im1, ax=axes[0], label='u_x')\n",
    "        axes[0].set_title(f'Vitesse x (t={times[t_index]:.2f})')\n",
    "        \n",
    "        im2 = axes[1].imshow(uy, cmap='RdBu_r', origin='lower')\n",
    "        plt.colorbar(im2, ax=axes[1], label='u_y')\n",
    "        axes[1].set_title(f'Vitesse y (t={times[t_index]:.2f})')\n",
    "        \n",
    "        im3 = axes[2].imshow(velocity_magnitude, cmap='viridis', origin='lower')\n",
    "        plt.colorbar(im3, ax=axes[2], label='|u|')\n",
    "        axes[2].set_title(f'Module de vitesse (t={times[t_index]:.2f})')\n",
    "        \n",
    "        plt.tight_layout()\n",
    "        plt.show()"
   ]
  }
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