Learning Forum

[bryan.nguyen]

I have a boundary node/surface that is only exposed to environmental radiation.  I want to be able to assign the heating rates to a register so I can track track it and do calculations in Sinda/logic manager.  This is my current logic block

"      Register=Submodel.QNode#".  I have the symbol output as a register.  When I try to plot the register, it remains as the global value and doesn't change with time.  When I plot the heat rates on the boundary node of Submodel.Node#, I have a value that changes with time.  Is there a reason my register is not updating or are there any workarounds to this.  When I use the logic block on a node that's not a boundary node, it works.

To add to this, I'm on Thermal Desktop 25.2.

[Doug Bell]

The Q on a boundary node is unique in that it represents the heat flowing through conductors/ties to any other node/lump (at least in the output calls). Any applied heat loads are overridden by this calculation (see HNQCAL subroutine). The calculation is performed automatically before each output call. Therefore, you could store the data by using user logic at the end of each time step (variables 2). Since register expressions (in the definition) are updated regularly, that would almost always be output as the calculated enegy balance.