I'm confused how freestream bc differs from normal inletoulet BC
Based on my readings
Freestream BC
freestream BC has the type inlet/outlet meaning that it looks locally (forevery face of the patch) at the mass flow rate. If the flow is going outside the boundary will be locally zero gradient, if it is going inside the boundary will be locally fixedValue. This boundary condition provides a free-stream condition. It is a ’mixed’ condition derived from the inletOutlet condition, whereby the mode of operation switches between fixed (free stream) value and zero gradient based on the sign of the flux
inletoutlet The inletOutlet boundary condition is normally the same as zeroGradient, but it switches to fixedValue if the velocity vector next to the boundary aims inside the domain (backward flow). The value of that fixedValue is inletValue. See figure (📷). (source: https://www.cfdsupport.com/OpenFOAM-Training-by-CFD-Support/node114.html) inletOutlet Boundary Condition - CFD support www.cfdsupport.com inletOutlet Boundary Condition. The inletOutlet boundary condition is normally the same as zeroGradient, but it switches to fixedValue if the velocity vector next to the boundary aims inside the domain (backward flow). The value of that fixedValue is inletValue.See figure (). Then how Freestream BC differs or modified from conventional inletoutlet BC?
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