Hello, I followed the tutorials and created the bentpipe is Salome and then exported to OpenFOAM. https://youtu.be/elSwrbGZnLQ After adjusting the values in OpenFOAM, I got the bentpipe to run in icoFoam but my Courant number exploded (near 1400) and the simulation stopped. In the tutorial at youtube (spoken-tutorial), the tutor says there is another tutorial but I cannot understand his words. It is supposed to be a tutorial on adjusting the boundary, etc. I would like to know how to adjust my controldict/boundary/P,U, ect. so that my currant number does not explode. Any help would be appreciated. Thanks, HappyS5