[LeConcierge]

Hello everyone

I have recently started using OpenFoam (v11) for my work and have encountered a problem that is really confusing to me. I am trying to simulate a mixer with an oscillating plate as the mixing element. If I only want to check the movement, there is the so-called “movingMesh” command. Here only the mesh movement is simulated. Everything looks good so far. Then I set up the exact same case, except that I now start the correct simulation with “foamRun”. And in this simulation, my mesh of the shaft and the plate moves further and further down as the simulation progresses (see pictures of both simulations after 10 s). The red lines on the images mark the area in which the shaft should move (the shaft and the plate move with an amplitude of 2 mm and a frequency of 75 Hz). During the simulation with “movingMesh”, the shaft and plate always return to the same starting point. This is not the case with the correct simulation. Can anyone provide me with a possible reason for this? Or are my settings for the calculation of the mesh movement fundamentally wrong?

Thanks in advance and best regards,
J.