Natural Circulation in a reactor 2D
 

Hello
My professor has given me a project to perform in CFD. I have been trying to do it since a long time but im unfortunately not able to solve it . Ive reached out to several freelancers too but none of them could do it for me... Can anyone please help me with this? i really need to finish this project soon...
Sadly, im not an expert at fluent so im trying to work my way around it.
I just want a basic idea of what parameters should i calculate so that i can proceed with the inputs and what conditions should i apply to the model?
Its supposed to be a natural circulation process in a reactor ... with heat exchanger at the top and a reactor at the bottom ... the entire reactor is placed in a pool and the temp and pres are mentioned .. the natural circulation process should be achieved... can anyone please help me out?

THanks...