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#1 |
New Member
David Car
Join Date: Mar 2009
Location: Dayton, OH, USA
Posts: 7
Rep Power: 17 ![]() |
Hello everyone,
I've really struggled on exactly how to post this question, so I'll start from the top. I was simply running a flat plate, incompressible, BL solution because I had extended the plot3dToFoam app to be able to specify more advanced BC's and I was using that as a test case. The simulation was a fairly fine grid with cyclic BC's (i.e. no empty boundaries). The flow was aligned with the x-direction and the y-direction was normal to the plate. I used icoFoam (and yes I know simpleFoam would be fine also, but I wanted to use icoFoam for the moment) and never had the solution converge. The strange part was that the convergence hang up was in the z-velocity residuals where I really wouldn't expect any. The grid is completely orthogonal (yes I ran checkMesh and its perfectly orthogonal), but a few complaints on grid stretching, but the stretching is aligned with the flow. These spurious z-velocities were troublesome, so I decided to set up a very simple uniform velocity test case. A very basic square mesh, using empty BC's for the z-direction. I set a uniform velocity field of 1 in the x-direction and set appropriate BC's (see the attached tarball for the test case). A very simple 20x20 grid, very coarse. ![]() |
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#2 |
New Member
David Car
Join Date: Mar 2009
Location: Dayton, OH, USA
Posts: 7
Rep Power: 17 ![]() |
I forgot to add that I've run this on 3 different versions of OpenFOAM. 1.4-dev version from the old svn repo, 1.5 binary from opencfd and 1.5.x from the git repos as of 10/21/08. I also ran it on two different architectures with two different gcc's with the same results.
All the best, David |
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