Hello,

I am having some trouble doing a flow simulation and request some help..
The system is the following: an 800 liter vessel (initial conditions 0.5 mbar of nitrogen) is injected with nitrogen through a small 4 mm diameter tubing. The tubing has a 2 bar pressure upstream. In front of the nozzle, inside the vessel, are some obstacles and what I wanted to find out is how the injected gas flows around them and diffuses. There is no exit hole (in reality there is but during injection it is sealed off), hence no mass balance but there is an accumulation of mass and increase of pressure. Flow simulation it seems doesn't allow me to design the system with no exit. Do I need a workaround of some sorts? Am I doing something wrong? Am I missing something?

help is much appreciated. Thx in advance