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[FAQ]

Generally, mass flow boundary conditions should be avoided when using the FT-TBR method as it makes the solution unstable. This is because the periodics have defined mass flows due to phase shifting. Additionally, most transient cases will not have a constant mass flow rate and imposing one would be non-physical. The use of Average Static Pressure for outlet boundary conditions is preferred over mass flow outlets. Similarly, using a total pressure inlet boundary condition is preferred over a mass flow inlet.