Keyframes velocity inlet broken in latest version (25.2.1), works in earlier

kjetilbmoe · August 23, 2025, 8:48pm

Easily reproducable by running the pulsating fluid bed example. The inlet velocity should change as per the first graph, but is constant zero, shown in the second image.

There seems to have been done significant improvements to the keyframe interface in the latest version, which might explain why this bug occurs just now.

It has been consistently tested on several installations using version 25.1.2 (and a few earlier) and 25.2.1. Most are running on WSL (Windows 11), and Fedora Linux 42, and MFiX is installed using Linux HPC option.

(This particular keyframe example produces quite beautiful results, bottom image, when using a version that works.)

jeff.dietiker · August 25, 2025, 11:43am

Thanks for the bug report, we will fix for the next release.

jeff.dietiker · August 25, 2025, 12:25pm

Please try this temporary fix until the next release:

In the GUI Editor, open set_bc1.f (Click “Copy” at the top-right corner to copy the file to the project directory.
Go to line 634 and comment it out. Save the file.
Build the custom solver.
Run the simulation with the custom solver (select [project]/mfixsolver in the list of solvers).