Search found 2584 matches

by Yvan Fournier
Wed Apr 24, 2019 11:12 pm
Forum: Code_Saturne usage
Topic: how does the periodic routine calculate pressure gradient
Replies: 4
Views: 8

Re: how does the periodic routine calculate pressure gradient

Hello, I suppose it is the same method. Code_Saturne does not compute the pressure drop based on the source term, but based on the differential operators used in the simulation. The source term allows to compensate for the pressure drop in the periodic domain due to viscous terms (the pressure needs...
by Yvan Fournier
Wed Apr 24, 2019 2:11 pm
Forum: Code_Saturne usage
Topic: how does the periodic routine calculate pressure gradient
Replies: 4
Views: 8

Re: how does the periodic routine calculate pressure gradient

Hello, I am not sure I understand correctly, but in the case of a uniform velocity source term applied to the whole domain, I understand such a source term is equivalent to a change of variable so that the "equivalent" pressure can be periodic. As the source term basically compensates for the pressu...
by Yvan Fournier
Tue Apr 23, 2019 7:00 pm
Forum: Code_Saturne usage
Topic: Wind tunnel modelling, BCs and convergence issues
Replies: 8
Views: 64

Re: Wind tunnel modelling, BCs and convergence issues

Hello, No, you do not need to define another cell zone. The fan definition array label should be "Fan id" and not "Zone id" (I'lll fix it in version 6.0. I do not remember about the normalization, but if in doubt, check with 2 different vector lengths. The fan modeling will behave as an explicit vel...
by Yvan Fournier
Sun Apr 21, 2019 7:13 pm
Forum: Code_Saturne usage
Topic: RANS/LES Simulation
Replies: 1
Views: 14

Re: RANS/LES Simulation

Hello, I do not see why this sort of restart is incompatible, though it might not be very useful since you need several runs through the fluid domain for statistics, and a few runs before that for a good initialization. So you will probably only save 10 or 20 percent of computational time. In any ca...
by Yvan Fournier
Sun Apr 21, 2019 12:44 pm
Forum: Code_Saturne usage
Topic: Coarser meshes produces better results?
Replies: 3
Views: 21

Re: Coarser meshes produces better results?

Hello, Mesh quality may play a part, but the main explanation may be error compensation. Without the details of your computation, I can't say much, but your choice of wall law may be more or less adapted to a resolved mesh, and depending how features of your flow are captured by the k-epsilon model,...
by Yvan Fournier
Fri Apr 19, 2019 7:50 pm
Forum: Code_Saturne usage
Topic: Contour plot at (almost) each time step
Replies: 1
Views: 7

Re: Contour plot at (almost) each time step

Hello, Using only the GUI, the best solution is to use ParaView Catalyst for this: based on an initial computation on a few time steps and the same (or a coarser version of) the mesh, you can export a Catalyst Python script from ParaView. Then place that file in the DATA subfolder of your case direc...
by Yvan Fournier
Thu Apr 18, 2019 10:25 am
Forum: Code_Saturne usage
Topic: msh preprocessing error
Replies: 4
Views: 23

Re: msh preprocessing error

Hello, The version compatibility is explained in my previous post. Basically, force Gmsh output to V2 format for all releases of Code_Saturne older than last week (there was an initial update a few months ago bug Gmsh checnged their format again from 4.0 to 4.1, so you will only get compatibility wi...
by Yvan Fournier
Thu Apr 18, 2019 8:42 am
Forum: Code_Saturne usage
Topic: Internal FSI coupling and mesh overlap
Replies: 10
Views: 71

Re: Internal FSI coupling and mesh overlap

Hello,

I am not 100% sure, but if you ensure the region where you prescribe displacement is not simultaneously handled with an internal structure (possibly using internal coupling with other boundary zones) it should be ok.

If you have a small test case I can look.

Regards,

Yvan
by Yvan Fournier
Wed Apr 17, 2019 10:42 pm
Forum: Code_Saturne usage
Topic: Wind tunnel modelling, BCs and convergence issues
Replies: 8
Views: 64

Re: Wind tunnel modelling, BCs and convergence issues

Hello, To add to the previous post, yes, monitors in Code_Saturne are usable for time averages of volume fields, including from the GUI. Surface monitors are available also but not yet from the GUI. For convergence, a rule of thumb which was quoted quite some years ago for unsteady computations was ...
by Yvan Fournier
Wed Apr 17, 2019 1:00 pm
Forum: Code_Saturne usage
Topic: msh preprocessing error
Replies: 4
Views: 23

Re: msh preprocessing error

Hello, Which version of Gmsh was the file exported from ? The Gmsh file format ha changed recently, so you may need either to use a more recent version of Code_Saturne (in you case, compiling it from the GitHub branch, as 5.0.10 is not released yet, but the updates for Gmsh are ready), or export to ...