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Syrthes - how calc reaction heat at nodes with fixed temp. ?

Posted: Sun Aug 27, 2017 4:36 pm
by kathi
hello

how can one calculate the reaction heat at nodes with a fixed temperature (=nodes which have a Diriclet boundary condition)?

I tried to get it with the surface energy balance keyword, like this:

/BILAN FLUX SURFACIQUES= 12

where 12 is the reference (group of face elements) of the conduction mesh to which the Diriclet condition is applied.
But the result is zero. It seems that /BILAN FLUX SURFACIQUES works only for other types of boundary conditions like heat exchange, radiation etc.

regards kathi

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added 01. Sept , one more question:

(A)

how can I get the heat which passes through a certain section of my model? It seems me rather cumbersome to evaluate the heat flux at this section and to integrate it with the section area. What I tried instead:

I partitioned the mesh in 2 contacting parts, in syrthes I defined a contact boundary condition (with a property which influences only very little the heat flow). Then I included
/BILAN FLUX SURFACIQUES ref1
/BILAN FLUX SURFACIQUES ref2
where ref1, ref2 are the references of the 2 contacting boundaries. But the output is zero!!

can somebody please give me a good advice?

(B)

in the user manual (version 4.1) I find the keyword
ECRITURES OPTIONNELLES RAYONNEMENT= OUI
for output on the radiation mesh.
But syrthes 4.3 does not accept that keyword, it answers "unknown keyword".
Has it been substituted, and by what?

thank you
kathi