OpenFOAM Dam Break: Understand alpha.water (VOF) + interFoam Basics | Ch7–Part 4 скачать в хорошем качестве

OpenFOAM Dam Break: Understand alpha.water (VOF) + interFoam Basics | Ch7–Part 4

In Chapter 7 – Part 4, we go deeper into the VOF (Volume of Fluid) method and explain—clearly and precisely—what alpha means in multiphase OpenFOAM simulations (in this case: alpha.water). In this video, you’ll learn: ✅ What alpha represents in VOF alpha = 1 → 100% water alpha = 0 → 100% air ✅ Why setFields is essential We used setFields to turn a uniform initial field into a non-uniform alpha distribution, so the initial water column exists correctly. ✅ interFoam overview (how the solver works) Two incompressible, immiscible fluids with a sharp interface (VOF) Density and viscosity are updated from alpha (mixture properties) interFoam solves an extra equation: the alpha transport equation (to move/sharpen the interface) Gravity-related terms (g, gh, ghf) appear because density changes across the interface matter ✅ Convert results to VTK and view in ParaView Use foamToVTK to export all time steps into a VTK/ folder Load the VTK series in ParaView and inspect alpha.water easily Compare alpha before vs after setFields (both can appear if they exist in time=0) ✅ Smoothed vs cell-based visualization of alpha Smoothed/interpolated view looks softer due to ParaView interpolation Cell-centered view shows sharp, true stored values (clear 0/1 jumps) Next part (Part 5) We’ll apply the physical properties for both phases (liquid + gas) and continue the full multiphase setup. #OpenFOAM #CFD #MultiphaseFlow #VOF #interFoam #DamBreak #alphaWater #foamToVTK #ParaView #OpenFOAMTutorial #ComputationalFluidDynamics #Linux