August 31, 2023 at 2:34 pm
I've tried 3 methods to initialize the solution:
Method 1 - Standard with defaults: I initially computed from inlet and then on the next initializations I've left it blank, Reference Frame: Relative to Cell Zone, Open Channel Initialization Method: Flat, Localized Turbulence Initialization Method: Unticked, Gauge Pressure: 0, X Velocity; 0, Y Velocity; 0, Z Velocity; 0, Turbulent Kinetic Energy: 3.75e-07, Specific Dissipation Rate: 1.047235, Water Volume Fraction: 0.
Method 2 - Hybrid Initialization with defaults: I initially computed from inlet and then on the next initializations I've left it blank, Open Channel Initialization Method: Flat.
Method 3 - Standard Initialization with defaults (as above) and patching the zone with the oddity with air.
In all cases I have the inlet oddity.
In Models -> Multiphase:
Models Tab: Model: VOF, Volume Fraction Parameters: Implicit, Body Force Formulation: Implicit Body Force ticked, VOF Sub-Models: Open Channel Flow and Open Channel Wave BC both ticked, Interfase Modeling Sharp.
Phases Tab: Air is Primary Phase and Water Secondary.
Phase Interaction Tab: Force Setup: constant 0.072, Global Options: Surface Tension Modeling ticked, Continuum Surface Force selected, Adhesion Options: Wall Adhesion ticked. (I also tried without surface tension)
In Solution -> Methods: defaults. Scheme: SIMPLE, Spatial Discretization: Gradient: Least Squares Cell Based, Pressure: PRESTO!, Momentum: Second Order Upwind, Volume Fraction: Compressive, Turbulent Kinetic Energy: Second Order Upwind, Specific Dissipation Rate: Second Order Upwind, Pseudo Time Method: Off, Transient Formulation: First Order Implicit, Non-Iterative Time Advancement unticked, Wrapped-Force Gradient Correction unticked, High Order Term Relaxation unticked.
Here's an image with a refined inlet mesh.