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#1 |
New Member
Brett Tully
Join Date: Mar 2009
Posts: 2
Rep Power: 0 ![]() |
Hi guys,
I am relatively new to OpenFOAM and am trying to assess if it is a suitable tool to use for my DPhil. I have started by trying to design a simple case to test features that I will need to use. I have a 1/4 circle extruded to make a "wedge" cylinder. The flat surfaces are symmetry conditions, and the circular face is a wall (essentially forming an pipe), the ends are inlet (fixed velocity) and outlet (fixed pressure). I can run this with a blockMesh generated mesh with no problems, however, it will be important for me eventually to be able to use unstructured tet meshes. For this, I have written a *.geo file and fed it to gmsh2ToFoam and as far as I can tell the generated mesh is decent (viewed in paraFoam, and run checkMesh). Yet, if I pass the same control/initial conditions from the blockMesh case to this one, the first few iterations _converge_ but it eventually blows up. Looking at the results from the first few iterations with paraFoam shows that these solutions are not at all correct. Can anyone suggest where I can look to see what is causing the trouble. It is important to be able to use unstructured grids, as my project will require some very complex meshes. Cheers, Brett. |
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#2 |
New Member
Christian Wesemeyer
Join Date: Mar 2009
Posts: 19
Rep Power: 17 ![]() |
Hi Brett,
I've also just started using openFOAM. So I also tried to simulate the flow through a circular pipe. First I've tried icoFoam, but my results also were divergent. So I've switched to simpleFoam for the steady state solution but even now I received strange results. After a while I figured out, that the "double used" points (as described on p. 148 of the users manual) in the middle of the tube were the problem (but untill now I have no idea why). An image of the calculated velocity profile is in the attached case (t1_u.jpg). After I've put then on one of the sides everything worked fine (see images the attached case): ![]() Greetings Christian |
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