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simulation.py
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simulation.py
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# initial values
import sys
from numpy.core.umath import pi
from numpy.ma import sin
scale = 50 # 1m -> 50 cells
size_x = 6 * scale
size_y = 4 * scale
damping = 0.99
omega = 3 / (2 * pi)
initial_P = 200
vertPos = size_y - 3 * scale
horizPos = 1 * scale
wallTop = size_y - 3 * scale
wall_x_pos = 2 * scale
max_pressure = initial_P / 2
min_presure = -initial_P / 2
class Simulation:
def __init__(self):
self.frame = 0
self.pressure = [[0.0 for x in range(size_x)] for y in range(size_y)]
# outflow velocities from each cell
self._velocities = [[[0.0, 0.0, 0.0, 0.0] for x in range(size_x)] for y in range(size_y)]
self.pressure[vertPos][horizPos] = initial_P
def updateV(self):
"""Recalculate outflow velocities from every cell basing on preassure difference with each neighbour"""
V = self._velocities
P = self.pressure
for i in range(size_y):
for j in range(size_x):
if wall[i][j] == 1:
V[i][j][0] = V[i][j][1] = V[i][j][2] = V[i][j][3] = 0.0
continue
cell_pressure = P[i][j]
V[i][j][0] = V[i][j][0] + cell_pressure - P[i - 1][j] if i > 0 else cell_pressure
V[i][j][1] = V[i][j][1] + cell_pressure - P[i][j + 1] if j < size_x - 1 else cell_pressure
V[i][j][2] = V[i][j][2] + cell_pressure - P[i + 1][j] if i < size_y - 1 else cell_pressure
V[i][j][3] = V[i][j][3] + cell_pressure - P[i][j - 1] if j > 0 else cell_pressure
def updateP(self):
for i in range(size_y):
for j in range(size_x):
self.pressure[i][j] -= 0.5 * damping * sum(self._velocities[i][j])
def step(self):
self.pressure[vertPos][horizPos] = initial_P * sin(omega * self.frame)
self.updateV()
self.updateP()
self.frame += 1
argc = len(sys.argv)
if argc > 1 and sys.argv[1] == '1':
wall = [[1 if x == wall_x_pos and wallTop < y < size_y else 0
for x in range(size_x)] for y in range(size_y)]
elif argc > 1 and sys.argv[1] == '2':
wall = [[1 if (x == wall_x_pos and wallTop + scale < y < size_y) or
(wall_x_pos - scale < x < wall_x_pos and
x - wall_x_pos == y - wallTop - scale - 1) or
(wall_x_pos < x < wall_x_pos + scale and
x - wall_x_pos == -y + wallTop + scale + 1)
else 0
for x in range(size_x)] for y in range(size_y)]
else:
wall = [[1 if (x == wall_x_pos and wallTop + scale < y < size_y) or
(wall_x_pos - scale < x < wall_x_pos and
x - wall_x_pos == y - wallTop - scale - 1) or
(wall_x_pos < x < wall_x_pos + scale and
x - wall_x_pos == -y + wallTop + scale + 1) or
(wall_x_pos - 0.75 * scale < x < wall_x_pos - scale / 2 and
x - wall_x_pos == -y + wallTop - scale / 2 + 1) or
(wall_x_pos + scale / 2 < x < wall_x_pos + 0.75 * scale and
x - wall_x_pos == y - wallTop + scale / 2 - 1)
else 0
for x in range(size_x)] for y in range(size_y)]