Raising the time step 5x ran 1.9x faster; 10x ran no faster at all — the window implicit surface tension opens
·8 min read
Breaching the capillary time-step constraint leaves other ceilings standing. Janodet et al. (2025) measured the stability limit and the speed-up optimum at a density ratio of 1000.
Why a Droplet at Rest Starts to Flow — Parasitic Currents and Well-Balanced Surface Tension
·6 min read
The parasitic currents born from curvature error, and the well-balanced method that eliminates them
Why Droplet Simulations Get Trapped by Δt — Solving Surface Tension Implicitly
·5 min read
Reproducing Janodet 2025, which breaks the capillary time-step shackle with implicit surface tension
Why Droplets Are Round and Water Climbs the Glass — Surface Tension and Contact Angle
·5 min read
From the physics of surface tension to contact angle and the CSF model in CFD