I have been running the flow simulation on a heat exchanger for a week now. The program would calculate fine even with the drawing underdefined. The only thing it would not show is the graphic simulation of the fluid flow. Set the model up again with full definition and now right at the start of calculation the program abnormally terminates. I have checked some of the forums on this issue and from that I have defragged my system and even made a clone of the project. The comp is brand new with enough power to run the computation. Even checked with the task manager and the cpu never peaked at 100% before it terminated it self. If anyone has an idea please let me know. Also the calculation never has any iterations before it terminates.