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Ansys Fluent – Free Surface (Weir 2D)

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Free surface is the surface of a fluid that is subject to zero parallel shear stress, such as the interface between two homogeneous fluidsfor example, liquid water and the air in the Earth’s atmosphere. Unlike liquidsgases cannot form a free surface on their own. Fluidized/liquified solids, including slurriesgranular materials, and powders may form a free surface.

A liquid in a gravitational field will form a free surface if unconfined from above. Under mechanical equilibrium this free surface must be perpendicular to the forces acting on the liquid; if not there would be a force along the surface, and the liquid would flow in that direction. Thus, on the surface of the Earth, all free surfaces of liquids are horizontal unless disturbed (except near solids dipping into them, where surface tension distorts the surface in a region called the meniscus).

In a free liquid that is not affected by outside forces such as a gravitational field, internal attractive forces only play a role (e.g. Van der Waals forceshydrogen bonds). Its free surface will assume the shape with the least surface area for its volume: a perfect sphere. Such behaviour can be expressed in terms of surface tension. It can be demonstrated experimentally by observing a large globule of oil placed below the surface of a mixture of water and alcohol having the same density so the oil has neutral buoyancy.

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In this tutorial you will learn to simulate a free surface in 2D using ANSYS Fluent. First, we will build a geometry and then we will generate the mesh using a structured mesh in Ansys Meshing.

## 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 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

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. Unlike liquids, gases cannot form a free surface on their...

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