Hi, I am trying to model a single channel of a typical pressurized water reactor, considering three physics, the point kinetics model for the calculation of energy generated inside the fuel pellet, the heat transfer, and the turbulent flow of the coolant water.
Please take a look at the attached two files. In the first file, I used the Non-Isothermal flow (nitf) k-epsilon model, and implemented the point kinetics model by the Global node, and the it works! However, if I change the heat transport turbulence model from "Kays-Crawford" to "Extended Kays-Crawford" option, it does not work!
The only difference between the first and second file, is that, I put the ODE equation outside of the Non-Isothermal flow (nitf) module, and it could not converge!
Could anyone explain to me why the above things happen and what mistakes I have made there?
Thanks.
Lei
Please take a look at the attached two files. In the first file, I used the Non-Isothermal flow (nitf) k-epsilon model, and implemented the point kinetics model by the Global node, and the it works! However, if I change the heat transport turbulence model from "Kays-Crawford" to "Extended Kays-Crawford" option, it does not work!
The only difference between the first and second file, is that, I put the ODE equation outside of the Non-Isothermal flow (nitf) module, and it could not converge!
Could anyone explain to me why the above things happen and what mistakes I have made there?
Thanks.
Lei