[ouez]

Hello Everyone,

I'm new in Star CCM+.
I want to know how to make a simulation of gas dispersion (methane CH4) in the atmosphere in STAR CCM+. The release source is a simple cylinder.
Which model (Eulerian or Lagrangian? Multiphase flow? Turbulent dispersion) and injector to use?

thank you very much

[ping]

since both fluids are gases you dont need multiphase

start with multi-component non reactive gases in the physics models and a simple inlet boundary condition

[ouez]

Thank you ping,

i'll try it,

I also want to know how to visualize the plume ?

[ping]

i suggest you do at least this tutorial
Tutorial Guide > Incompressible Flow > Steady Multi-Component Flow: Dilution Pipe and the one after that and it will become clear that you have new field functions to view and report on the component gases

but you also need to do all the early tutorials to learn the basics

[ouez]

So I enter Velocity inlet in my cylinder inlet boundary and pressure in my cylinder outlet.
but how to get multi-component non reactive gases in Physic models?
i choose Gas; steady, gradients, three dimensional, turbulent, RANS

Thank you

[ping]

please do the tutorials and most will become clear

this will help prevent you asking such basic questions that clog up the forum - we like to help but it goes both ways

[ouez]

i didn't see your last message. Thank you for the Tutorial !!!