Hi Everyone!
I was solving the example problem 4 (Tally Arithmetic) of openMC using the same code as in example. But the results are different: the k-effective (collision) in my case is 1.04068 +/- 0.00520 whereas in the example the value is 1.02889 +/- 0.00492. Also there is a difference in the leakage fraction as well as other values. So does this difference infer a coding error or is it normal to get such variation?
Thank You in Advance
Regards
Shubham
Answering an old message that never received a response – because Monte Carlo is a stochastic method, the exact results can be very sensitive to many things. For example, the cross sections you are using, the compiler used to compile the code, the version of system libraries, etc. In general, it can be difficult to reproduce exact answers from one machine to another, so it is entirely normal to get such variation. If you want to compare results across machines, what you should be looking for is that two answers on the same problem (using the same cross sections) agree within statistics.
Best regards,
Paul