Modeling 2-D jets impinging on Stirling regenerators

Stirling machines often include a flow transition, from tubes or channels to a regenerator matrix, in which high velocity jets impinge on a porous material. This phenomenon is modeled in two dimensions with the Manifest computer program, resulting in some visual flow representation and lending credibility to a simple expression for flow uniformity as a function of penetration depth. Two-dimensional laminar jets impinging on regenerator samples of variable permeability, ranging all the way from no matrix at all to matrices dense enough to stop the jet dead on are shown. All simulations were run on a Cray X-MP computer