Скачать или смотреть VOF Multiphase Flow in CFD Explained-Explicit vs. Implicit Formulations

How do we simulate fluids mixing, separating, or interacting in different phases (liquid/gas/solid)? This video breaks down the key concepts—with a focus on Volume Fraction and Explicit vs. Implicit Formulations—to help you optimize your CFD simulations!

📌 Key Topics Covered:
✔ What is Multiphase Flow?
Tracking interactions between liquids, gases, and solids in a computational domain.

✔ Volume Fraction

The "fingerprint" of each phase in every grid cell (sum = 1).

Critical for accurate interface tracking (e.g., water bubbling through air).

✔ Explicit vs. Implicit Formulations

Aspect Explicit Implicit
Method Solves current step directly Solves current + future steps iteratively
Pros Faster per step, simpler Stable for large steps, robust
Cons Small time steps (CFL-limited) Computationally expensive
💡 When to Use Which?
Explicit: Quick simulations with fine time resolution (e.g., splashing droplets).

Implicit: Complex, slow-moving flows (e.g., sediment settling in water).

🔧 Software Used: ANSYS Fluent
📊 Physics Models: VOF (Volume of Fluid), Explicit and Implicit formulation

💬 Discussion Time!
Which formulation do YOU prefer for your projects?
Explicit for speed or implicit for stability? Drop your thoughts below!

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