As a side-note, selecting each of the items in the tree under the analysis container will open a Task Tab to make various choices. Of course, since the model has a high aspect ratio, the issue is that the long channel requires a small mesh anyway.so yeah.In the CfdOF Workbench, create an Analysis Container. The time to mesh (and to solve!) will be slashed with a chainsaw. The result will be a mesh that will be extremely fine where you need it and coarse where calculation is less critical. That way instead of waiting 1h30 to see a too fine result, you'll use your time better overall
So the times can shoot up very fast! Start large.
Means two times as many cells to fill your model.and the calculation time isn't linear either. If you reduce your cell dimension by factor 0.8, you're reducing your volume by 0.8^3 which is 0.512. Bear in mind that each reduction will not yield a linear increase in time. Then you keep going with regions always finer, 0.5, 0.3, 0.1.etc. Select regions by type of refinement, so one mesh region object should be named "rough" and perhaps have a factor of 0.8 (0.8 x base cell size in previous step), select regions that need a slightly better calculation resolution. Then you select the mesh object in the tree, and use the mesh region tool. This will be fast but will not cover all areas. When you create the mesh, at first, use a coarse but reasonable cell size, in your case 0.25 - 1 mm should work. The whole model does not need to be meshed finely. Thank´s for helping me.ģD_Test_Parameter_without_mesh.FCStd (55.69 KiB) Downloaded 52 times 3D_Test_EN.png (36.02 KiB) Viewed 2318 timesĪlso in 3D you may be able to reduce drastically your meshing time by using meshing regions. In this post we already discussed my problem:įeel free to edit my file and ask me if anything is missing or you want to know something. I generated a Dropbox link for the complete file. The file does not have a “mesh” because the file with the “mesh” is too large. > are my limits correct? I have Inlet, Inlet 1, Outlet and all other pages as "Wall" or do I have to specify the symmetry area as such? > is it even possible that there is water pressure on the inlet and air pressure on inlet 1? My goal is to study the distribution of pressure and speed in the nozzle and on other different nozzle models. The outlet is the small diameter at the end (outlet). During normal water jet cutting, abrasive (sand) is sucked in there. The mixing chamber (Inlet 1) has an ambient pressure of 1 bar (air), which creates a negative pressure. I´m a german student and currently dealing with the simulation of water jet cutting.
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