What is the best way to represent fin fan coolers nozzles using CAESAR II,we know that since there is some expansion slots in the coaler cells we can not assume the nozzles as anchors with predefined displacement and even though we try it is hard to predict the amount of displacement ,can we represent the nozzles as limit stops with very high concentrated weight above it ????

model the header box with nozzle using rigids. restrain the box with y restraint, limit stops and guide. (depending upon fixed / floating header box)and with appropriate rotations arrested. Also distribute the weight of the header box and a portion of tube bundle weight among the supports.