Reply To: Pressure Based Solver vs Density Based Solver

[egorbena]

Dear all,

I tried to solve the above transient problem using two different conditions for the outlet boundaries to assess the propagation of the shock-wave outside the tunnel. These are:

• Pressure outlet using standard density based solver.


• Pressure outlet using density based solver with acoustic wave model - non reflecting (to avoid unreal reflection of the shock-wave from the outlet boundaries).

In the first approach, the shock wave is reflected at the boundaries. In the second approach, I wasn't able to run the simulation from t = 0, when doing so, looks like a high pressure is entering from the outlets (see attached figure). Instead, if I run the simulation for some time-states with the pressure outlet using standard density based and then I switch to the acoustic wave model - non reflecting condition, the result is fine.

What setting should I use to be able to run a DBS-AWMNR from t = 0?

Thank you.

 

Kind regards,

Eduardo