Heat Convection Cells

import matplotlib.pyplot as plt
import numpy as np

# Rayleigh-Benard convection cell
n = 6
x = np.linspace(-2, 2, n)
y = np.linspace(-1, 1, 4)
z = np.linspace(0, 2, 5)
X, Y, Z = np.meshgrid(x, y, z)

# Convection roll pattern
U = np.sin(np.pi * X / 2) * np.cos(np.pi * Z / 2)
V = np.zeros_like(X)
W = -np.cos(np.pi * X / 2) * np.sin(np.pi * Z / 2)

fig = plt.figure(figsize=(10, 8), facecolor='#ffffff')
ax = fig.add_subplot(111, projection='3d', facecolor='#ffffff')

ax.quiver(X, Y, Z, U, V, W, length=0.3, normalize=True,
          color='#dc2626', alpha=0.8, arrow_length_ratio=0.3)

ax.set_xlim(-2.5, 2.5)
ax.set_ylim(-1.5, 1.5)
ax.set_zlim(-0.5, 2.5)

ax.set_xlabel('X', color='#1f2937', fontsize=10)
ax.set_ylabel('Y', color='#1f2937', fontsize=10)
ax.set_zlabel('Height', color='#1f2937', fontsize=10)
ax.set_title('Heat Convection Cells', color='#1f2937', fontsize=14, fontweight='bold', pad=20)

ax.tick_params(colors='#6b7280', labelsize=8)
ax.xaxis.pane.fill = False
ax.yaxis.pane.fill = False
ax.zaxis.pane.fill = False
ax.xaxis.pane.set_edgecolor('#e5e7eb')
ax.yaxis.pane.set_edgecolor('#e5e7eb')
ax.zaxis.pane.set_edgecolor('#e5e7eb')

ax.view_init(elev=20, azim=30)
plt.tight_layout()
plt.show()