Search found 98 matches

by Brian Angel
Thu Nov 27, 2014 5:19 pm
Forum: code_saturne usage
Topic: Convergence troubles with large domains
Replies: 9
Views: 2189

Re: Convergence troubles with large domains

Hello, I see that from the check_mesh.log file you have some cells that have a high non-orthogonality. My experience is that Code_Saturne doesn't like this type of cell and can cause the calculation to diverge or not run. I usually get around this problem by refining the mesh and eliminating those c...
by Brian Angel
Fri Nov 14, 2014 5:40 pm
Forum: code_saturne usage
Topic: BUG: Coupled simulation of single pin heat sink is unstable
Replies: 9
Views: 1656

Re: BUG: Coupled simulation of single pin heat sink is unsta

Hello,

I will download your files and take a look next week and come back to you.

Regards,

Brian Angel.
by Brian Angel
Tue Nov 11, 2014 11:39 am
Forum: code_saturne usage
Topic: BUG: Coupled simulation of single pin heat sink is unstable
Replies: 9
Views: 1656

Re: BUG: Coupled simulation of single pin heat sink is unsta

Hello Christoph, The CFD codes that I have used to date, both open source and commercial, can remain stable when the Courant number is greater than 1 and still give good results. A general rule of thumb that I use is an average Courant number of the order of 5 but with a maximum CFL which can be gre...
by Brian Angel
Mon Nov 10, 2014 11:01 pm
Forum: code_saturne usage
Topic: Tutorial about the coupling simulation with SYRTHES
Replies: 15
Views: 6685

Re: Tutorial about the coupling simulation with SYRTHES

Hello, Having read the output and if I have understood it correctly, it would appear thar SYRTHES is trying to acces something in the rep_listint which is not stored in memory hence the SIGSEGV. Can you try and use --main-stacksize=10000000 (which is greater than 8388608) or another value which is g...
by Brian Angel
Mon Nov 10, 2014 3:46 pm
Forum: code_saturne usage
Topic: Some problems on wall shear stress calculation
Replies: 4
Views: 2004

Re: Some problems on wall shear stress calculation

Hello, 1) I think that you will need to define "nfac" as an integer in the routine cs_user_parameters. 2) In clptur, I searched for "usertau" and can only see the line "usertau(ifac)=0" at line 714 in this routine. I cannot see a declaration for usertau as "double ...
by Brian Angel
Mon Nov 10, 2014 3:26 pm
Forum: code_saturne usage
Topic: Variable volumetric source term
Replies: 2
Views: 1076

Re: Variable volumetric source term

Hello, You should be able to code pwatt directly in the ustssc routine. This routine has access to the rtp, rtpa and propce arrays which store the following: rtp - all flow variables at the cell centres at the current time step / iteration rtpa - all flow variables at the cell centres at the previou...
by Brian Angel
Thu Nov 06, 2014 11:40 am
Forum: code_saturne usage
Topic: flow in catalytic converter?
Replies: 3
Views: 1260

Re: flow in catalytic converter?

Hello,

Please find attached an hdf and a xml file which shows how to set up a multi flow domain calculation in SALOME and Code_Saturne. Please go through the two files and the set up thoroughly and if you have any questions afterwards please let me know.

Regards,

Brian Angel.
by Brian Angel
Wed Nov 05, 2014 9:56 pm
Forum: code_saturne usage
Topic: BUG: Coupled simulation of single pin heat sink is unstable
Replies: 9
Views: 1656

Re: BUG: Coupled simulation of single pin heat sink is unsta

Hello, Following on from my previous post, I left the Code_Saturne calculation running and the flow variables have obtained numbers of the order of e+11 after some 600 time steps. I noticed during this calculation that the maximum Courant number increases from one time step to the next, even when th...
by Brian Angel
Wed Nov 05, 2014 9:43 pm
Forum: code_saturne usage
Topic: flow in catalytic converter?
Replies: 3
Views: 1260

Re: flow in catalytic converter?

Hello, It is possible to do a multiple flow domain in Code_Saturne including a porous media zone as we have done it numerous times recently. However, I'm not sure that there is a tutorial on this website that shows how to set up such a model. I'll speak with the other support engineers to find out w...
by Brian Angel
Wed Nov 05, 2014 5:17 pm
Forum: code_saturne usage
Topic: BUG: Coupled simulation of single pin heat sink is unstable
Replies: 9
Views: 1656

Re: BUG: Coupled simulation of single pin heat sink is unsta

Hello, I've run your set up with separate calculations for Code_Saturne and SYRTHES to see if I can get the codes running separately. SYRTHES: I set the BaseFin condition to 50°C and the CouplingFinfaces to 0°C, both for heat exchange type BCs with h = 1W/m2K. SYRTHES runs for 10000 iterations with ...