OpenFOAM Dam Break: fvSchemes + fvSolution Explained (interFoam) | Ch7–Part 7 скачать в хорошем качестве

OpenFOAM Dam Break: fvSchemes + fvSolution Explained (interFoam) | Ch7–Part 7

In Chapter 7 – Part 7, we review the numerical discretization schemes and solver controls used in the OpenFOAM damBreak case with interFoam. This is where the multiphase case becomes “real CFD”: flux definitions, alpha-interface capturing, and PIMPLE settings that control stability and accuracy. What we cover in this video ✅ 1) fvSchemes (Discretization) Time discretization: Euler (1st order time scheme) Main focus: divSchemes (divergence schemes) ✅ 2) Divergence schemes in interFoam (why they look different) Momentum equation involves density → effectively mass fluxes (not only volumetric flux) Alpha equation is a phase-fraction transport → uses volumetric flux (phi) That’s why you see separate terms like: div(phi, alpha) for alpha.water ✅ 3) Interface compression term (phiRb / MULES) interFoam uses an interface-capturing approach (commonly associated with MULES) You’ll see extra divergence terms related to phiRb to keep the interface sharp We explain what this term does and why its discretization scheme matters ✅ 4) fvSolution (Solvers + Algorithm Controls) In multiphase with gravity, pressure is typically p_rgh (not plain p) Review solver dictionaries for: velocity p_rgh alpha.water (often) pCorrection for initialization/stability ✅ 5) Alpha controls: corrections, sub-cycling, and cAlpha Number of alpha corrections Sub-cycles inside each time step cAlpha controls interface compression/sharpness Higher cAlpha → sharper interface, but can reduce stability Tutorial recommendation: keep cAlpha = 1 ✅ 6) Relaxation + PIMPLE settings relaxationFactors (set to 1 here; reduce if unstable) PIMPLE configuration: No momentum predictor 1 outer corrector Multiple pressure corrections (e.g., 3) 0 non-orthogonal correctors (structured mesh) Next part (Part 8) We’ll run the damBreak case in parallel, and compare serial vs parallel results and post-processing. #OpenFOAM #CFD #DamBreak #interFoam #VOF #fvSchemes #fvSolution #MULES #p_rgh #PIMPLE #cAlpha #NumericalSchemes #MultiphaseFlow #OpenFOAMTutorial #Linux