CAESAR estimates piping as line elements. As the pipe heats up, it will expand in diameter, but by default, CAESAR does not calculate this. To mimic this phenomenon, you would need to include (rigid) piping elements between the center of your pipe to the guide/pipe interfaces, and place a "stop" on each rigid element that acts as a "guide" for the main pipe.
Edited to add:
Note that this will not take credit for flexibility of the piping via ovalization. This you will have to calculate on your own and input as the spring constant for your two "stops." Without this flexibility, you will end up with monstrous loads and therefore monstrous amounts of friction.
Edited again to add:
Note that your guide might also be more flexible than the pipe itself, in which case, use that instead.
Edited by Michael_Fletcher (05/18/17 07:59 AM)