Talking broadly, Fluent (Chapter 1: Introduction to Ansys Fluent) and CFX (Chapter 2: Overview of Ansys CFX) are the CFD software.
Whereas ‘CFD-post’ 2.11.2. CFD-Post (ansys.com) is used for post-processing simulation results. Nowadays, EnSight Chapter 1: Overview (ansys.com) is widely used for post-processing.
If you are talking about Transient Analysis (Structural and Thermal), they are performed in Ansys Mechanical: Overview (ansys.com)
If you are not able to access the links, please refer to this forum discussion: How to access the ANSYS Online Help
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