Outflow boundary conditions for low-Mach buoyant computational fluid dynamics
Trettel, Benjamin Michael
Trouve, Arnaud C
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General issues with outflow boundary conditions are discussed, as are the issues specific to flow with buoyancy such as unphysical build-up of fluid at the outflow boundary. Different solutions to these problems are detailed. The sponge-layer approach is used to model the outflow boundary in buoyant jets. The successes and shortcomings of the sponge-layer approach are made clear through comparisons with long domain simulations.