References for the Brinkman Equations Interface
1. D. Nield and A. Bejan, Convection in Porous Media, 3rd ed., Springer, 2006.
2. M. Le Bars and M.G. Worster, “Interfacial Conditions Between a Pure Fluid and a Porous Medium: Implications for Binary Alloy Solidification,” J. Fluid Mech., vol. 550, pp. 149–173, 2006.