Ansys Fluent - Elbow 2D (Steady & Transient Simulation)
Written by cfd.ninja
The two dimensional elbow is the cheapest way to see the difference between a steady and a transient run. Both solve the same equations; what changes is whether time appears in them.
A steady run looks for the state the flow settles into and is the right choice when that state exists. A transient run follows the evolution step by step, which is what you need when the flow never settles, or when the question is how long something takes rather than where it ends up.
A useful habit is to start steady and switch to transient only if the residuals refuse to fall or the monitored quantities keep oscillating. That oscillation is usually the physics telling you the flow is genuinely unsteady, not a numerical problem to be damped away.
In this tutorial, we will simulate an Elbow 2D in the Steady and Transient state. First, we will use SpaceClaim to creating the geometry in 2D and then we will use Ansys Meshing and Ansys Fluent. You can download the geometr and mesh from this link.
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