Search found 74 matches

by MartianDuan
Tue Aug 05, 2014 10:43 pm
Forum: code_saturne usage
Topic: How to set the relaxation coeffiecient of variables?
Replies: 2
Views: 937

Re: How to set the relaxation coeffiecient of variables?

Thanks, Yvan. I will try the idea in my following work.
by MartianDuan
Wed Jul 23, 2014 11:39 pm
Forum: code_saturne usage
Topic: How to set the relaxation coeffiecient of variables?
Replies: 2
Views: 937

How to set the relaxation coeffiecient of variables?

Dear developer and users, I am now working on the LES of water pipe flow under super-critical pressure, which means the properies would change dramtically at certain temperature region. The divergence was happened when it solving energy equation after several time steps. The error information is sho...
by MartianDuan
Wed Jul 23, 2014 3:59 pm
Forum: code_saturne usage
Topic: How to make the additional writer active?
Replies: 16
Views: 3396

How to make the additional writer active?

Dear developer and users, I was trying to define a additional writer to outpur the results and the domain every three time step. The following the the lines I putted in the cs_user_postprocess.c, (The subroutine is attached as well.) /* Default writer time dependency */ fvm_writer_time_dep_t time_de...
by MartianDuan
Wed Jul 23, 2014 4:41 am
Forum: code_saturne usage
Topic: Some questions on getting strain rate or gradient/derivative
Replies: 0
Views: 5152

Some questions on getting strain rate or gradient/derivative

Dear developers and users, I am now working on the flow among fuel bundle by using LES and code_saturne 3.0.1. I need to calculate the terms in the tubulent kenitic energy equation and Reynolds stresses euqations, some of which requires the fluctuating strain rate . Is there any possible to access t...
by MartianDuan
Mon Jul 14, 2014 1:26 pm
Forum: code_saturne usage
Topic: Introduction on parallel subroutines.
Replies: 1
Views: 514

Introduction on parallel subroutines.

Hello users, I am trying to parallelise my subroutines in code saturne 3.0.*. I know that code saturne offered some parallel subroutines, like paramin, paramax, or parasom to help user to parallize the serial suntoutine. I would like to have a full picture on these subroutines. I tried to find the i...
by MartianDuan
Mon Jul 14, 2014 1:14 pm
Forum: code_saturne usage
Topic: Subroutine decreases computing efficiency
Replies: 5
Views: 1177

Re: Subroutine decreases computing efficiency

Hello Yvan, Thanks for your reply. I did not realize the boundary condition sub routine can be a problem on the efficiency. Please have a look at it, in attachment. Thanks very much, Yu. Hello, The routines should not be slower, unless the coding of cs_user_boundary_conditions.f90 is bad. Could you ...
by MartianDuan
Wed Jul 09, 2014 11:52 am
Forum: code_saturne usage
Topic: How to create a inflow generator for LES?
Replies: 2
Views: 593

Re: How to create a inflow generator for LES?

Hi Yvan, Thanks for your reply. I will keep on searching solutions. Thanks again, Yu. Hello, I believe some colleagues have done this sort of thing occasionally, but am not sure how. You could use a periodic duct with a velocity source term, but you then need to couple it to the main domain. This co...
by MartianDuan
Wed Jul 09, 2014 11:49 am
Forum: code_saturne usage
Topic: Subroutine decreases computing efficiency
Replies: 5
Views: 1177

Re: Subroutine decreases computing efficiency

Hi Yvan, Thanks for you reply. I just used the cs_user_boundary_conditions.f90 and cs_user_parameters.f90 to run the test case. But the computing effiecent suffered, It is just a third of the case set by .xml. I did another test, slimming the sub_routine files, which was deleting the unusage lines. ...
by MartianDuan
Fri Jul 04, 2014 1:34 pm
Forum: code_saturne usage
Topic: How to create a inflow generator for LES?
Replies: 2
Views: 593

How to create a inflow generator for LES?

Dear users, I am trying to do a simulation on the supercritical fluids flow in a heated pipe by using code_saturne 3.0.1. I need to create an inflow generator in the front of the flow domain, to make the flow develop. Two line system will be introduced to generate the turbulent flow generator, as sh...
by MartianDuan
Fri Jul 04, 2014 10:44 am
Forum: code_saturne usage
Topic: Subroutine decreases computing efficiency
Replies: 5
Views: 1177

Subroutine decreases computing efficiency

I just did some test on the Code_Saturne 3.0.1.

Compared to the case set by using '.xml', the computing efficient greatly suffered when the subroutine was used to set the parameters.

Did anyone come across such problem before.

Thanks in advance.