This page runs a finite-difference time-domain (FDTD) solution of Maxwell's equations on a Yee grid, directly in your browser. A researcher gets a deterministic electromagnetics testbed with no install and no cluster queue, useful for prototyping a method before committing it to HPC. GDBS is a bridge to HPC, not a surrogate for it.
Vacuum total EM energy < 1e-25
Vacuum quiescence keeps the total electromagnetic energy below 1e-25 (energy conservation), and a dipole source injects energy with the correct field oscillation and sign reversal. Verified against the published FDTD method of Yee 1966 (DOI 10.1109/TAP.1966.1138693).
The solver advances Maxwell's equations with a Yee-grid leapfrog scheme: the electric and magnetic field components are staggered in space and time, and updated in alternating half-steps. Two checks are reported. First, with no source present (vacuum quiescence), the integrated total EM energy stays below 1e-25, demonstrating energy conservation of the update. Second, a dipole source injects energy and produces field oscillation with the correct sign reversal.
This is a periodic-torus Yee testbed, with no open-boundary PML in the default configuration. It is a teaching and prototyping bridge, not a replacement for Meep or Lumerical.
10.1109/TAP.1966.1138693)Open the electromagnetics (FDTD) engine in GDBS and run it yourself. It is deterministic and runs in your browser.
Open electromagnetics (FDTD) in GDBS See the full validation table