import numpy from string import Template from simulation import Lattice, Geometry from utility.particles import Particles from symbolic.generator import LBM import symbolic.D3Q19 as D3Q19 from OpenGL.GL import * from OpenGL.GLUT import * from OpenGL.GL import shaders from pyrr import matrix44, quaternion lattice_x = 64 lattice_y = 64 lattice_z = 64 updates_per_frame = 20 particle_count = 50000 lid_speed = 0.1 relaxation_time = 0.515 def get_cavity_material_map(geometry): return [ (lambda x, y, z: x > 0 and x < geometry.size_x-1 and y > 0 and y < geometry.size_y-1 and z > 0 and z < geometry.size_z-1, 1), # bulk fluid (lambda x, y, z: x == 1 or y == 1 or z == 1 or x == geometry.size_x-2 or y == geometry.size_y-2, 2), # walls (lambda x, y, z: z == geometry.size_z-2, 3), # lid (lambda x, y, z: x == 0 or x == geometry.size_x-1 or y == 0 or y == geometry.size_y-1 or z == 0 or z == geometry.size_z-1, 0) # ghost cells ] boundary = Template(""" if ( m == 2 ) { u_0 = 0.0; u_1 = 0.0; u_2 = 0.0; } if ( m == 3 ) { u_0 = $lid_speed; u_1 = 0.0; u_2 = 0.0; } """).substitute({ "lid_speed": lid_speed }) def get_projection(width, height): world_width = lattice_x world_height = world_width / width * height projection = matrix44.create_perspective_projection(45.0, width/height, 0.1, 1000.0) look = matrix44.create_look_at( eye = [0, -2*lattice_y, 0], target = [0, 0, 0], up = [0, 0, -1]) point_size = 1 return numpy.matmul(look, projection), point_size class Rotation: def __init__(self, shift, x = numpy.pi, z = numpy.pi): self.shift = shift self.rotation_x = x self.rotation_z = z def update(self, x, z): self.rotation_x += x self.rotation_z += z def get(self): qx = quaternion.Quaternion(quaternion.create_from_eulers([self.rotation_x,0,0])) qz = quaternion.Quaternion(quaternion.create_from_eulers([0,0,self.rotation_z])) rotation = qz.cross(qx) return numpy.matmul( matrix44.create_from_translation(self.shift), matrix44.create_from_quaternion(rotation) ) def glut_window(fullscreen = False): glutInit(sys.argv) glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH) if fullscreen: window = glutEnterGameMode() else: glutInitWindowSize(800, 500) glutInitWindowPosition(0, 0) window = glutCreateWindow("LBM") return window lbm = LBM(D3Q19) window = glut_window(fullscreen = False) particle_shader = shaders.compileShader(Template(""" #version 430 layout (location=0) in vec4 particles; out vec3 color; uniform mat4 projection; uniform mat4 rotation; vec3 fire(float x) { return mix( vec3(1.0, 1.0, 0.0), vec3(1.0, 0.0, 0.0), x ); } void main() { gl_Position = projection * rotation * vec4( particles[0], particles[1], particles[2], 1. ); color = fire(1.0-particles[3]); }""").substitute({}), GL_VERTEX_SHADER) vertex_shader = shaders.compileShader(Template(""" #version 430 layout (location=0) in vec4 vertex; out vec3 color; uniform mat4 projection; uniform mat4 rotation; void main() { gl_Position = projection * rotation * vertex; color = vec3(1.0,1.0,1.0); }""").substitute({}), GL_VERTEX_SHADER) fragment_shader = shaders.compileShader(""" #version 430 in vec3 color; void main(){ gl_FragColor = vec4(color.xyz, 0.0); }""", GL_FRAGMENT_SHADER) particle_program = shaders.compileProgram(particle_shader, fragment_shader) projection_id = shaders.glGetUniformLocation(particle_program, 'projection') rotation_id = shaders.glGetUniformLocation(particle_program, 'rotation') geometry_program = shaders.compileProgram(vertex_shader, fragment_shader) lattice = Lattice( descriptor = D3Q19, geometry = Geometry(lattice_x, lattice_y, lattice_z), moments = lbm.moments(optimize = True), collide = lbm.bgk(f_eq = lbm.equilibrium(), tau = relaxation_time), boundary_src = boundary, opengl = True ) lattice.apply_material_map( get_cavity_material_map(lattice.geometry)) lattice.sync_material() particles = Particles( lattice.context, lattice.queue, lattice.memory.float_type, numpy.mgrid[ 8*lattice.geometry.size_x//10:9*lattice.geometry.size_x//10:10j, lattice.geometry.size_y//10:9*lattice.geometry.size_y//10:particle_count/100j, 8*lattice.geometry.size_z//10:9*lattice.geometry.size_z//10:10j, ].reshape(3,-1).T) rotation = Rotation([-lattice_x/2, -lattice_y/2, -lattice_z/2]) def on_display(): for i in range(0,updates_per_frame): lattice.evolve() lattice.collect_gl_moments() for i in range(0,updates_per_frame): lattice.update_gl_particles(particles, aging = True) lattice.sync() glClear(GL_COLOR_BUFFER_BIT) glEnableClientState(GL_VERTEX_ARRAY) particles.gl_particles.bind() shaders.glUseProgram(particle_program) glUniformMatrix4fv(projection_id, 1, False, numpy.ascontiguousarray(projection)) glUniformMatrix4fv(rotation_id, 1, False, numpy.ascontiguousarray(rotation.get())) glVertexPointer(4, GL_FLOAT, 0, particles.gl_particles) glPointSize(point_size) glDrawArrays(GL_POINTS, 0, particles.count) shaders.glUseProgram(geometry_program) glUniformMatrix4fv(projection_id, 1, False, numpy.ascontiguousarray(projection)) glUniformMatrix4fv(rotation_id, 1, False, numpy.ascontiguousarray(rotation.get())) glPolygonMode(GL_FRONT_AND_BACK, GL_LINE) glBegin(GL_POLYGON) glVertex3f(0,0,0) glVertex3f(lattice_x,0,0) glVertex3f(lattice_x,lattice_y,0) glVertex3f(0,lattice_y,0) glEnd() glBegin(GL_POLYGON) glVertex3f(0,0,lattice_z) glVertex3f(lattice_x,0,lattice_z) glVertex3f(lattice_x,lattice_y,lattice_z) glVertex3f(0,lattice_y,lattice_z) glEnd() glBegin(GL_LINES) glVertex3f(0,0,0) glVertex3f(0,0,lattice_z) glVertex3f(lattice_x,0,0) glVertex3f(lattice_x,0,lattice_z) glVertex3f(lattice_x,lattice_y,0) glVertex3f(lattice_x,lattice_y,lattice_z) glVertex3f(0,lattice_y,0) glVertex3f(0,lattice_y,lattice_z) glEnd() glutSwapBuffers() def on_reshape(width, height): global projection, point_size glViewport(0,0,width,height) projection, point_size = get_projection(width, height) def on_keyboard(key, x, y): global rotation x = { b'w': -numpy.pi/10, b's': numpy.pi/10 }.get(key, 0.0) z = { b'a': numpy.pi/10, b'd': -numpy.pi/10 }.get(key, 0.0) rotation.update(x,z) def on_timer(t): glutTimerFunc(t, on_timer, t) glutPostRedisplay() glutDisplayFunc(on_display) glutReshapeFunc(on_reshape) glutKeyboardFunc(on_keyboard) glutTimerFunc(10, on_timer, 10) glutMainLoop()