[Robin.Kamenicky]

Hello everyone,

I am dealing with heat transfer in a solid tube (Check attachement).

The thing is, that in tube occures boiling and so also HTC correlaions for computing HTC are changing.

What I want to do is to write following convective boundary condition depending on maximum temperature on the tube wall:
#Twi is initial temperature at tube wall
#Tonb is temperature at Onset of nucleate boiling point
#Tofdb is temperature at Onset of fully developed boiling point

IF Twi <= Tonb
HTC1

ELSE
IF Twi <= Tofdb
HTC2
ELSE
EXIT SIMULTATION "Temperature is too high"
END
END

#When simulation ends
IF abs((maxVal(Temperatue)@TubeWall)-Twi)>Twi/100
Twi=maxVal(Tempreatue)@TubeWall
Do the whole simulation again
ELSE
EXIT "Simulation was successful"
END


I know I can write a funtion with CEL and use if( cond_expr, true_expr, false_expr ) but is there a possibility to use WHILE LOOP and so iterate the simulation based on the simulation result?

[Fabio_Teixeira]

For the variable HTC you can use CEL creating a expression like HTC = if(Twi <= Tonb, HTC1, HTC2). Then you create stop condition on "Interrupt Control Conditions" (check this video https://www.youtube.com/watch?v=KLv-By0PKiM).

Finally, to do the simulation again you can use the expression maxVal(Temperatue)@TubeWall)-Twi as an Post output parameter and create a Workbench script to read the parameter and check the condition with a if statement. (if you don't know how to write a script file you can search on this forum other threads about it and do some test with recording a journal on WB File>Scripting>Record Journal).