Thermal analysis

I need a CFD thermal analysis using ANSYS fluent flow software. I need to check the temperatures reached inside a closed subsea bottle. The external temperature of the bottle is 4°C, inside it has an aluminum structure, a board with a processor and a converter that are the heat sources. This processor and converter dissipate 5 Watts and 20 Watts respectively. In the end, I need the Ansys fluent flow files.
The internal fluid in the bottle is gaseous nitrogen. The bottle is made of 316 stainless steel.

I need a static and transient analysis. For transient, 30 minutes.