pressure outlet on star ccm+ : water heater tank
 

hello,
we are french students in an engineering school and we are working on a school project with Star ccm+. Our subject is the visualisation of the temperature stratification in a water-heater tank.
We created the geometry with a "valve" in the bottom which is a little hole in a corner and we put the pressure outlet condition on. indeed, our water-heater is a closed environnement so we need this valve to avoid issues with temperature and pressure increase. But we don't know how to parameter it.
We used these parameters : steady, laminar, gravity, 2D, gradient, polynomial density, segregated fluid temperature, segregated flow, liquid.

we never used the pressure outlet option with our teachers so we don't even know if we have to chose "target mass flow", "pressure jump" ...
we want to simulate a leak (whit the valve) when the pressure is greater than 3bar. The heat comes from an electrical resistance in the bottom.

thanks you for your answers

Just specity the pressure. As name suggest "target mass flow" option will add pressure to specified pressure to match the targetted mass flow. Pressure jump also adds pressure jump.
If you use default settings then you just specify pressure and dont touch other things.

Hello, how did you do this? I am trying a similar thing with a valve that should release when inner pressure is >0.1 bar.

I tried with a Pressure Outlet with a Pressure of 0.1bar but the simulation diverges. Not sure how to model that

Any idea?