Ansys Fluent - Multiphase Flow (Free surface)
Written by cfd.ninja
A free surface problem has two immiscible fluids, usually air and water, sharing the domain with a sharp interface between them. Dam breaks, tank filling, sloshing, spillways and open channels all fall in this category.
The Volume of Fluid model is the standard approach. Instead of tracking the interface as a geometric surface, it solves a transport equation for the volume fraction of each phase in every cell, and the interface appears wherever that fraction goes from one to zero. One momentum equation is shared, with density and viscosity weighted by the fractions present.
Two settings decide whether the interface stays crisp. The time step must keep the Courant number low, so that the interface moves less than one cell per step, and the mesh must be fine enough where the surface travels. If the interface smears over several cells, the cause is almost always one of those two.
Convert Photography to Mesh using Gmsh
Learn how to generate a CFD mesh from any photograph using the Gmsh mesher.
Ansys Fluent Tutorial | Heatsink
In this tutorial, you will learn how to simulate a Heatsink using Ansys Fluent. In this first video, you will see how to create the geometry and the mesh using DesignModeler, Ansys Meshing and Ansys Fluent.
Related Articles
Ansys Meshing – Multizone + Inflation
In this tutorial, you will learn to use the Multizone and Inflation tool using Ansys Meshing.
Ansys Meshing – Multizone + Inflation + Face Meshing
In this tutorial you will learn how to generate a structured mesh using Ansys Meshing.
Ansys Meshing | Inflation
In this tutorial, you will learn to use the Inflation tool in Ansys Meshing to control the boundary layer mesh near walls for more accurate CFD simulations.
Convert Photography to Mesh using Gmsh
Learn how to generate a CFD mesh from any photograph using the Gmsh mesher.
Ansys Fluent Tutorial | Heatsink
In this tutorial, you will learn how to simulate a Heatsink using Ansys Fluent. In this first video, you will see how to create the geometry and the mesh using DesignModeler, Ansys Meshing and Ansys Fluent.
Ansys Fluent | Hydraulic Jump
Ansys Fluent | Hydraulic Jump Written by cfd.ninja Free surface is the surface of a fluid that is subject to zero parallel shear stress, such as the interface between two homogeneous fluids, for example, liquid water and the air in the Earth's atmosphere....