Fluid Flow - Liquid Nitrogen

Hi everyone

I'm trying to simulate cooling a solid submerged in liquid nitrogen.
I've successfully simulated cooling a hot solid submerged in water using both Turbulent Bubbly Flow and Laminar Flow, coupled with Heat Transfer.

However, I'm struggling to achieve convergence using the liquid nitrogen material.

Has anyone here studied this problem or done something like this?
Can someone give me any tips or references?

Thank you