Retraction Note: J Eng Math (2020) 120:43–65 https://doi.org/10.1007/s10665-019-10031-9

The authors have retracted this article because it was brought to their attention that the governing equations in their formulation are flawed. Specifically, the gravitational term, which has been included incorrectly in the radial and tangential momentum equations, should instead have been incorporated into the vertical momentum equation. Furthermore, a porous media-related term, featuring the square of the vertical component of the velocity, should also have been included in the vertical component of the momentum equation. Dr. Sabyasachi Mondal has agreed to this retraction on behalf of the other authors.