Search found 37 matches

by Hakim
Wed Apr 30, 2014 3:09 pm
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

the same thing hapens with the following:
impout = impusr(1)
open(impout,file='profile.dat')
write(impout,99) max(rtp(iel,ivar),1.d-10),max(sfbr(iloc),1.d-10), ntcabs
99 format(6g17.9)
by Hakim
Wed Apr 30, 2014 3:07 pm
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

Hello Ivan, I'd like to extract the maximum values of ​​SFBR (ILOC) calculated in cs_postprocess_var to a datafile.dat and that for each time step. I tried with the following program but the problem is that I still do not get the same values ​​if I redo the simulation, of course after convergence. b...
by Hakim
Sun Mar 16, 2014 8:00 am
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

Hello,

even with the correction I still get the same problem, namely the evolution at the surface only,

best regards,

Hakim.
by Hakim
Thu Mar 13, 2014 12:55 pm
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

hello,

Can someone explain me why I get an evolution of the variable on surface only?

best regards,

hakim.
by Hakim
Mon Feb 24, 2014 3:38 pm
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

Hi Yvan

I want if you can to check these subroutines for me, because even if it works properly I can't have a results that I wwant. However, if I change the name of the variable to be displayed, for example rtp (iel, ivar) or rtp (iel, iu) I get exactly the expected values.

Best regards,

Hakim
by Hakim
Mon Jan 27, 2014 9:15 am
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

Hello,

I'd like to output this fonction as post-processed result on surface of symetry. can some one help me to do this?

A=(1/T²)*(dT/dX) +(1/T)*(du/dx).

or

A= (1/T²)*grad(T) * (1/T)*grad(U).

Best regards,

Hakim.
by Hakim
Thu Jan 23, 2014 11:07 am
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

Hello,

yes I know but I need a small illustrative example. is it possible for you to give me a small example in detai?

like A=(1/T²)*(dT/dX) +(1/T)*(du/dx).

Best regards,

Hakim.
by Hakim
Sun Jan 19, 2014 2:40 pm
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

Hello Can someone tell me how to calculate a function as post-processed quantities: S=(k/T)^2 * [(∂T/∂x)^2+(∂T/∂y)^2+(∂T/∂z)^2 ] + ( μ/T) * [2((∂u/∂x)^2+(∂v/∂y)^2+(∂w/∂z)^2 )+(∂u/∂y+∂v/∂x)^2+(∂u/∂z+∂w/∂x)^2 + (∂v/∂z +∂w/∂y )^2 ]. T: Temperature [k] k: Thermal conductivity, (constant) [W/m k] x,y and...
by Hakim
Mon Jan 13, 2014 4:07 pm
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Re: Entropy generation

Hello; The local volumetric rate of entropy generation, based on the second law of thermodynamics, is given for three dimensional flow as follows: S=(k/T)^2 * [(∂T/∂x)^2+(∂T/∂y)^2+(∂T/∂z)^2 ] + ( μ/T) * [2((∂u/∂x)^2+(∂v/∂y)^2+(∂w/∂z)^2 )+(∂u/∂y+∂v/∂x)^2+(∂u/∂z+∂w/∂x)^2 + (∂v/∂z +∂w/∂y )^2 ] the entr...
by Hakim
Tue Jan 07, 2014 5:08 pm
Forum: code_saturne usage
Topic: Entropy generation
Replies: 16
Views: 13903

Entropy generation

Hello;

can someone inform me about the procedure to be undertaken to evaluate the entropy of a thermodynamic system modeled with saturne_code?

best regards.

Hakim.