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

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kathi
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Joined: Tue Nov 04, 2014 11:04 am

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

Post by kathi » Sun Aug 27, 2017 4:36 pm

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

-------------------------------------
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
best regards

kathi

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