Search found 197 matches

by Antech
Wed Nov 16, 2022 4:36 pm
Forum: code_saturne usage
Topic: Conjugate heat transfer of simple geometries - comparison with exp data
Replies: 32
Views: 13361

Re: Conjugate heat transfer of simple geometries - comparison with exp data

The problem is not mesh quality but region selection syntax. Saturne does not understand spaces so use something like 55 or 52 or 49 in your BC selection expression. Also, you may use named selections if they are in "Groups" in listing (run_solver.log). I used mesh joining but in another c...
by Antech
Wed Nov 16, 2022 2:02 pm
Forum: code_saturne usage
Topic: Conjugate heat transfer of simple geometries - comparison with exp data
Replies: 32
Views: 13361

Re: Conjugate heat transfer of simple geometries - comparison with exp data

Hello. Regarding BCs. Try Mesh => List of meshes table => Add face groups / Add cell groups. Or use CGNS mesh.
As I know, there is HelixOS GUI for OpenFOAM. I tried and it worked, but there is only a limited set of features in it.
by Antech
Thu Nov 10, 2022 3:33 pm
Forum: code_saturne usage
Topic: Gas combustion: What is reaction kinetic model (flame stability)
Replies: 5
Views: 1754

Gas combustion: What is reaction kinetic model (flame stability)

Hello. I have a specific task to check the flame stability of industrial boiler burner. Our standard tool for this is Fluent, but I'd like to have another result to compare so I tried Saturne 7.0.2. As I understand, the only choice with reaction kinetic in Saturne is Libby-Williams model. Generally,...
by Antech
Wed Nov 02, 2022 10:38 am
Forum: code_saturne usage
Topic: Pressure drop in long pipe
Replies: 8
Views: 7140

Re: Pressure drop in long pipe

Hello. I tried k-epsilon with prism layers as you suggested. The mesh was for Y+ ~ 1.0. Result is not good, pressure difference is very high, 1320 Pa after 185 iterations and rising (usually 150...300 iterations is enough for "clear aerodynamics", so the pressure will not be lower with ite...
by Antech
Wed Nov 02, 2022 8:22 am
Forum: code_saturne usage
Topic: RSM SSG model + Least Squares + All vertexes does not work
Replies: 11
Views: 3626

Re: RSM SSG model + Least Squares + All vertexes does not work

Update. I needed to calculate the same setup with different geometry on RSM. I used simplified stabilizing algorithm and all things was good. No any convergence problems appeared despite of RSM that is known to be very unstable. Method I used is as follows. Stage 1 Discretization: Upwind for all var...
by Antech
Mon Oct 31, 2022 4:48 pm
Forum: code_saturne usage
Topic: Pressure drop in long pipe
Replies: 8
Views: 7140

Re: Pressure drop in long pipe

CFX uses "automatic" or "scalable" wall function (both for SST and k-epsilon models) that, I believe, means that it automatically chooses wall function suitable for any mesh. It can't turn simple tetra into inflated mesh but, if the mesh is more or less appropriate for the turbul...
by Antech
Mon Oct 31, 2022 3:41 pm
Forum: code_saturne usage
Topic: Pressure drop in long pipe
Replies: 8
Views: 7140

Re: Pressure drop in long pipe

Thanks for your attention! Saturne version is 7.0.2. I use 2 meshes: with prism layers (Y+ approx. 1.0) for SST model and just tetra without layers for k-epsilon model. So every turbulence model should have an appropriate mesh. Meshes are exactly the same as for CFX, only converted to CGNS format. I...
by Antech
Mon Oct 31, 2022 8:00 am
Forum: code_saturne usage
Topic: Pressure drop in long pipe
Replies: 8
Views: 7140

Re: Pressure drop in long pipe

Hello. Would anybody, please, clarify my question with distributed pressure drop with roughness?
I think you have validated the software in this aspect, maybe you can share some small test case? I will calculate with current Saturne version and other methods and present you with results.
by Antech
Thu Oct 27, 2022 8:27 am
Forum: code_saturne usage
Topic: Pressure drop in long pipe
Replies: 8
Views: 7140

Re: Pressure drop in long pipe

Hello. Yes, meshes are absolutely identical (exported from Ansys Meshing to CGNS) because they are small: 6 millions for SST and 12 millions for k-epsilon (because of wall sizing of 10mm). I checked Y+ in CFD-Post (CFX postprocessor) and it's OK for both meshes, although, for some model reason, it s...
by Antech
Wed Oct 26, 2022 3:20 pm
Forum: code_saturne usage
Topic: Pressure drop in long pipe
Replies: 8
Views: 7140

Pressure drop in long pipe

Hello. I have a problem with calculation of the pressure drop along pipe. It's very simple case. Pipe with 4 bends has internal diameter of ~0.36m and length of ~42m . Wall rougness is 400micron . Fluid is a particle laden gas flow, but let's assume just gas phase here. Initial task is connected wit...