Asymptotics of fiber spinning equations

We consider a model for the production of glass fibers in a rotating spinning device. The model depends on two small parameters, namely the Reynolds-number 6 and the Rossby-number E. For small Rossby-numbers, i.e., a fast rotating spinning drum, numerical difficulties arise. To overcome this problems, asymptotic expansions are carried out for the stationary, inviscid case delta = 0 as well as for the instationary, viscous case delta = 0(1).