This widget is a table to set contact resistance boundary conditions on specified pair of elements. One underlines that, contact resistance modelling turns out to very usefull in some configuration (for example to model jeat transfer through a crack) but the coefficient g (Flux through the crack = g*(T1-T2), where T1 and T2 are the unknown temperatures located on both sides of the crack) can be quite difficult to estimate. Therefore authors suggests that this notion be used only with caution by experienced users. One also underlines that in order to use this notion, the mesh has to be well generated, in particular with boundary elements having nodes at the same location on either side of the crack but different references. It is a complex component but behaves the same way as many SYRTHES tables.

In first column, one finds for each line check boxes. The purpose of the check box is to save (as comment not interpreted by SYRTHES) a setting we want momentarily discard. When trying different conditions, it may be interesting to comment a previous try instead of purely erasing it, and be obliged to retype it to come back to the previous parameters. This has been introduced in the SYRTHES interface to mimick the possiblility to simply activate or not a command or a condition by simply adding or removing a "/" in first column of the ASCII SYRTHES file.

The second column allows to choose between three possibilities :

Constant is indicating a contact resistance (in W/m2/Deg C) on a collection of elements identified by their reference. SYRTHES will scan all the element having these references and will set the prescribed temperature at all nodes belonging to these elements. One has to be aware that a node belonging to two elements with different colors and initial temperature conditions will get the condition indicated last.

Function follows the same principle but the setting of the contact resistance (in W/m2/Deg C) may this time be a function in which several parameters can be included :

Warning : no blanc is authorized in that string (type it the way you would write the corresponding C code).
Examples : 20+5*sin(0.01*y), 3*pow(x,2)

Program corresponds to configurations which cannot be handled with the two previous conditions. In that case, user will have to fill the corresponding C program which can be accessed through the window User C function. Still, users have to define the elements concerned by that condition in indicating the reference of these elements. This is compulsory to allocate the required memory.

"Ref group 1" corresponds to the list of references concerned by that conditions on one side of the crack while "Ref group 2" corresponds to the boundary elements belonging to the other side and facing each other. One underlines that user may replace a long list of references by several lines. Unlike some other table, using -1 has no sens, it is therefore forbiden.

"User comments" allows to put a short description of the boundary conditions set.

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SYRTHES version : 4.1.0
Name help file : Cont_res_table.html
I. Rupp, C. Peniguel - january 2013
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