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Hello Nektar++ Community,

I am using the HOutflow condition at the outlet of my flow domain with the incompressible Navier-Stokes solver. According to the user guide, this is enforcing a boundary condition defined by Dong, Karniadakis and Chryssostomidis in equation 3 of their paper: A robust and accurate outflow boundary condition for incompressible flow simulations on severely-truncated unbounded domains. This boundary condition is also stated in equations 11.27 and 11.28 of the user guide. Both the paper and the user guide state that ä is "chosen to be sufficiently small" without explaining what constitutes sufficiently small. Would anyone happen to know what value of ä is used by Nektar++ or where I could find it?

Kind regards,
Isaac