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[FAQ]

Dedicated post-processing applications like ANSYS CFD-Post or ANSYS EnSight have the capability to compare multiple cases. This can also be done in ANSYS Fluent directly, but it involves some additional effort, additional files and potentially a lot of additional memory. 1. Run the first calculation and save the results as interpolation file 2. Run the second calculation 3. Define Custom Field Functions (CFFs) for the variables you want to compare 4. Define as many User-Defined Memory (UDM) locations as you have variables to compare 5. Patch the results into the UDMs with the help of CFFs 6. Read the interpolation file of the first case which overwrites all results except the new UDMs 7. Define new CFFs to calculate the difference between the two results The attached document explains this process with a simple example. The example models are also available for download. When this document is written, the recommended workflow is to use EnSight to compare cases because it is much more efficient on the required memory and more flexible. But the workflow in Fluent works if you want to stay within the solver application.

Attachments:
1. 2061791-Fluent-case-comparison.pdf
2. 2061791.zip