An unsteady flow has, by definition, fluctuations in velocity and pressure. More often than not this results in a more or less pleasant noise. If you fear this noise could be on the less-pleasant side, you can simulate the sound and listen to it before the finished product causes Ye Royale Paine in Ye Buttocks. […]
In a random conversation I recently had, a question popped up: why do whistles whistle? I had no choice but to reach for the most complex tool available: OpenFOAM . All the Trouble It’s quite straightforward, get a model of a whistle and stick it into a solver. At least it seemed that easy at
Using OpenFOAM in parallel with MPI is well explained in the OpenFOAM manual. Rendering results in ParaView on multiple cores on a desktop computer is a little less explained on the light side of the internets. So here’s a quick’n’dirty tutorial for dummies. ParaView itself can’t render on multiple cores. pvserver, on the other hand,
In turbomachinery theory relative velocity is defined as w = c – u where u is circumferential velocity and c is absolute velocity at specified point. The relative velocity w is very important for evaulation of flow in or around rotating bodies. When using SRFSimpleFoam, Urel is automatically added to to resulting fields. With others (SimpleFoam with
Here’s a quick tutorial on interFoam solver from the OpenFOAM toolbox. It demonstrates how much mess one makes when sneezing close to a bowl of soup. The Case Every time I sneeze during lunchtime my imagination runs wild with images of soup splattering all over the place. It wouldn’t be very polite to try it
Merging Files If you’re using SALOME to create STL files for meshing you can only save separate surfaces to separate files. That’s not a problem if you’re using snappyHexMesh but cfMesh only takes an STL file that has all surfaces combined and named. I wrote a simple Python script that does that for you. Save
