[Murwin12]

Hello,

I have been recently having an issue when running a compressible steady-state thermal Fluent analysis where I am outputting area-weighted averages for static pressure, velocity and flow distribution across several cross sections, upstream and downstream of two porous regions. The geometry is extremely similar to a previous analysis I ran in a slightly older version of ANSYS, with the same inputs.

The issue is that the outputs are different for the new analysis depending on whether I:

1) take the original workbench project, clear the generated data on the Mesh, import the new geometry, remesh it with the same named selections as previous so that Fluent scoped the exact same regions, clear the solution data, resolve and observe the outputs in CFD-Post

2) or start a completely new workbench project set everything up from scratch and post-process this fresh solve

I initially thought that for option 1), the results were somehow influenced by the old results and were therefore corrupt. But since I cleared the generated data and had no result files I was struggling to then see how this was the case.

One subtle difference that I have noticed is that there is a slight mismatch in the inertial resistance I have set in one of my porous regions. This difference is in the non-axial direction and differs by less than 0.1% so would be surprised if such a small difference would have a large effect on the results. However, I do not know why this value has differed from what I had entered in the setup.

I understand I have not provided much info about the theory of the problem, this is because I am mainly suspecting the difference in the workbench project approach that I have used is the cause of this problem so I would be really grateful if anybody can think of what may have caused this significant difference in results.

Thanks in advance!