[rocketLauncher]

Hi all,

As part of a study comparing Ansys Fluent to open source CFD tools, I am starting with the simple case of laminar, incompressible flow in a mixing elbow. The elbow has two inlets at 1 and 3 m/s respectively and the outlet is set at 0 gauge pressure. I constructed a reference case in Ansys Fluent using the inviscid solver. The simulation converges nicely both in terms of residuals and the results visible in the velocity and pressure field contours.

However, I encountered problems when I exported the mesh from Ansys and used it in openfoam. I tried to set up the OF solver as close as possible to ansys but my velocity contours are very bizzare. Indeed, while the simulation converges in terms of residuals, the actual results are not good.

What could cause this difference of results? I am attaching a zip file that shows the contours to which I referred, the ansys mesh, and the OF case. Any ideas are welcome, this has been very frustrating.

Thanks in advance.


https://www.dropbox.com/scl/fi/i7fvg...=hdmnfavz&dl=0