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Please add this setup about Initialization, right click on Flow Analysis > Insert > Global Initialization then double click on Global Initialization and modify as it appears in the image below.

Remember that the air has 23 % oxygen, for this reason, O2 = 0.23, CO2 = 0.0 and H2O = 0.0, the initial temperature is 300 °K and the air velocity is 1 m/s.

In this tutorial you will learn to simulate Multi-Species (Smokestack) in 2D using ANSYS CFX. You can download the mesh from this link.

Ansys CFX Tutorial | Flow through Porous Media
In this tutorial you will learn how to simulate a Flow through Porous Media using Ansys CFX.

Ansys CFX – NACA 4412 (Structured Mesh)
The NACA four-digit wing sections define the profile by:
First digit describing maximum camber as percentage of the chord.
Second digit describing the distance of maximum camber from the airfoil leading edge in tenths of the chord.
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Ansys Fluent | Blower | Mesh Motion (Unsteady)
In this tutorial, you will learn how to simulate a blower (unsteady) using Mesh Motion with Ansys Fluent. Please download the mesh.
Ansys Fluent Tutorial – Blower
In this tutorial you will learn how to simulate a Blowe using Ansys Fluent through multiple reference frame.
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