[feride]

hi everybody,
I'm working on thermal hydrualic analysis of a nuclear reactor we can think fuel as heated cylindirical tubes which has bc with heat flux. There are 69 fuel rods ,heat flux is given as udf. working fluid temp is 300 K, The cooling mechanism is natural convection so ı try both boussienesq approx. tempereture dependent features with polynomial eq. in material box. The Ra number order is 10^13, I use k-e model for turbulent modeling, there are inlet pipe which is velocity inlet, outlet pipe which is out flow bc Btw fluid is water. I have tried many ways to converge continuity. but they didnt work. It would be much appreciated if you could share with me your opinions regards to this problem.

All the best