Search found 44 matches
- Thu Dec 08, 2022 10:31 pm
- Forum: code_saturne usage
- Topic: z_ground divergence atmo module
- Replies: 7
- Views: 18101
Re: z_ground divergence atmo module
Thank you for your answer. I have no time to check the resu tonight but I can try to answer some of your questions : - z ground is used to imposed initial and boundary profile for the velocity and the (potential) temperature with relief. In Monin Obukhov profiles we take the distance to the ground i...
- Wed Dec 07, 2022 7:42 pm
- Forum: code_saturne usage
- Topic: z_ground divergence atmo module
- Replies: 7
- Views: 18101
Re: z_ground divergence atmo module
Dear SimBu,
I suspect there is something wrong in you user subroutines because a ground has already been computed (from 0 to 50m) and should not be computed again.
Do you have any user subroutines which would explain the problem?
Best regards
Martin
I suspect there is something wrong in you user subroutines because a ground has already been computed (from 0 to 50m) and should not be computed again.
Do you have any user subroutines which would explain the problem?
Best regards
Martin
- Thu Sep 23, 2021 8:05 pm
- Forum: code_saturne usage
- Topic: Friction heating in heat transfer
- Replies: 9
- Views: 3270
Re: Friction heating in heat transfer
Hello, Just to answer to your first question: in the incompressible module the friction source term is neglected and not in the code. You can add it as a user source terme. For the compressible module, the solved equation is the total energy and the terme is handelled. Concerning the wall function, ...
- Wed May 19, 2021 9:02 pm
- Forum: code_saturne usage
- Topic: [Dispersion in frozen flow] - issue with user scalar value at boundary
- Replies: 5
- Views: 2318
Re: [Dispersion in frozen flow] - issue with user scalar value at boundary
Hello,
I think you should impose a flux rather a Dirichlet BC because otherwise the ongoing value of scalar is only from diffusion flux.
Could test that?
There is also a possibility to perform scalar balance in the GUI.
Best Regards
Martin
I think you should impose a flux rather a Dirichlet BC because otherwise the ongoing value of scalar is only from diffusion flux.
Could test that?
There is also a possibility to perform scalar balance in the GUI.
Best Regards
Martin
- Mon Jan 11, 2021 9:19 am
- Forum: Discussion
- Topic: Documentation of rough wall boundary conditions
- Replies: 5
- Views: 13735
Re: Documentation of rough wall boundary conditions
Hello, Indeed eq I.5.25 has a typo (no Clog). I will correct that. Concerning the two velocity scale, yes there are other references you can read (Craft, and also PHD of Jean-Francois Wald). The derivation of the BCs of k and epsilon is detailed in appendix (which help reading the code). Indeed the ...
- Thu Jan 07, 2021 7:39 pm
- Forum: code_saturne usage
- Topic: [Saturne 6.0.6] Particles are accelerated by head loss
- Replies: 12
- Views: 5441
Re: [Saturne 6.0.6] Particles are accelerated by head loss
Dear user, Thank you for the feedback. We are aware of this problem which is due to the fact, if I understand well, that the additional force you have on the mean fluid (with the head loss) is missing in the lagrangian module (all terms on the momentum are not automatically taken as they should). We...
- Wed Jul 22, 2020 5:24 pm
- Forum: code_saturne usage
- Topic: ALE - mesh viscosity in v6.0
- Replies: 12
- Views: 7973
Re: ALE - mesh viscosity in v6.0
Dear Daniele, The CDO solver used for ALE is not compatible yet with FSI (and INTERNAL coupling) because the way boundary conditions are treated are really different (using the GUI it is transparent, but you cannot use cs_user_boundary_conditions_ale.f90 for the CDO solver). We check if it is possib...
- Thu May 30, 2019 3:56 pm
- Forum: code_saturne usage
- Topic: Boussinesq approximation
- Replies: 6
- Views: 4742
Re: Boussinesq approximation
Hello, since version 6.0 there is an option to activate the Boussinesq approximation (indeed rho varies only in the buoyancy term and is supposed to be constant everywhere else).
Look for idilat = 0 in cs_user_parameter file.
Best Regards
Martin
Look for idilat = 0 in cs_user_parameter file.
Best Regards
Martin
- Thu May 30, 2019 1:42 pm
- Forum: code_saturne usage
- Topic: total pressure and gravity
- Replies: 5
- Views: 3619
Re: total pressure and gravity
Hello, If you want to model a free surface, you can also test the ALE module and then “free surface” boundary condition will be used. It will impose p0 at the freesurface and let it move with the flow. So if you have breaking waves this method does not work. We have also experimental options for tha...
- Thu May 30, 2019 1:38 pm
- Forum: code_saturne usage
- Topic: VOF and ALE compatible?
- Replies: 3
- Views: 3230
Re: VOF and ALE compatible?
Hello, It should be compatible but we don’t have any validation test case for that so that would be nice if you could set up a toy model test case to check if it is working correctly. If not, that will not be a big deal to fix (ALE is mainly impacting the other fields updating convective mass flux, ...