fluid.py 1.89 KB
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from ctypes import *
import numpy
import signal
import os

dir_path = os.path.dirname(os.path.realpath(__file__))
lib = CDLL(os.path.join(dir_path,"libmbfluid.so"))

signal.signal(signal.SIGINT, signal.SIG_DFL)


class StrongBoundary(Structure):
    _fields_ = [("tag",c_char_p),("field",c_int),("v",c_double)]


class fluid_problem :

    def __init__(self, mesh_file_name, mu, rho, epsilon, strong_boundaries):
        nsb = len(strong_boundaries)
        asb = (StrongBoundary*nsb)(*[StrongBoundary(i[0].encode(),i[1],i[2]) for i in strong_boundaries])
        self._fp = lib.fluid_problem_new(mesh_file_name.encode(), c_double(mu), c_double(rho), c_double(epsilon), nsb, asb)
        if self._fp == None :
            raise NameError("cannot create fluid problem")

    def __del__(self):
        if(self._fp != None) :
            lib.fluid_problem_free(self._fp)

    def adapt_mesh(self, gradmin, gradmax, lcmin) :
        lib.fluid_problem_adapt_mesh(self._fp, c_double(gradmin), c_double(gradmax), c_double(lcmin))

    def export(self, output_dir, t, it) :
        lib.fluid_problem_export(self._fp, output_dir.encode(), c_double(t), c_int(it))

    def compute_node_force(self, dt) :
        forces = numpy.ndarray([self.n_particles,2],"d")
        ptr = lib.fluid_problem_compute_node_particle_force(self._fp, c_double(dt),forces.ctypes.data)
        return forces

    def implicit_euler(self, dt) :
        lib.fluid_problem_implicit_euler(self._fp, c_double(dt))

    def set_particles(self, mass, volume, position, velocity):
        _mass = numpy.ascontiguousarray(mass).ctypes.data
        _volume = numpy.ascontiguousarray(volume).ctypes.data
        _position = numpy.ascontiguousarray(position).ctypes.data
        _velocity = numpy.ascontiguousarray(velocity).ctypes.data
        self.n_particles = mass.shape[0]
        lib.fluid_problem_set_particles(self._fp,c_int(mass.shape[0]),_mass,_volume,_position,_velocity)