FDTD Wave Equation
Wave speed c
0.4
Damping
0.001
Source freq
0.15
Source:
Point source
Line source
Double slit
Plane wave
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∂²u/∂t² = c²∇²u
Discretized (Courant):
uⁿ⁺¹ = 2uⁿ − uⁿ⁻¹
+ r²(Δ_x² + Δ_y²)u
r = cΔt/Δx ≤ 1/√2
Absorbing boundaries (PML)
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FDTD · Yee 1966 · wave equation · dispersion · Courant-Friedrich-Lewy condition
t=0