An ALE finite element method for a coupled Stefan problem and Navier–Stokes equations with free capillary surface
Article first published online: 6 AUG 2012
Copyright © 2012 John Wiley & Sons, Ltd.
International Journal for Numerical Methods in Fluids
Volume 71, Issue 10, pages 1282–1296, 10 April 2013
How to Cite
Bänsch, E., Paul, J. and Schmidt, A. (2013), An ALE finite element method for a coupled Stefan problem and Navier–Stokes equations with free capillary surface. Int. J. Numer. Meth. Fluids, 71: 1282–1296. doi: 10.1002/fld.3711
- Issue published online: 3 MAR 2013
- Article first published online: 6 AUG 2012
- Manuscript Accepted: 23 JUN 2012
- Manuscript Received: 14 MAR 2012
- Stefan problem;
- ALE formulation;
- free capillary surface;
- decoupling strategy
In this article, an ALE finite element method to simulate the partial melting of a workpiece of metal is presented. The model includes the heat transport in both the solid and liquid part, fluid flow in the liquid phase by the Navier–Stokes equations, tracking of the melt interface solid/liquid by the Stefan condition, treatment of the capillary boundary accounting for surface tension effects and a radiative boundary condition.
We show that an accurate treatment of the moving boundaries is crucial to resolve their respective influences on the flow field and thus on the overall energy transport correctly. This is achieved by a mesh-moving method, which explicitly tracks the phase boundary and makes it possible to use a sharp interface model without singularities in the boundary conditions at the triple junction.
A numerical example describing the welding of a thin-steel wire end by a laser, where all aforementioned effects have to be taken into account, proves the effectiveness of the approach.Copyright © 2012 John Wiley & Sons, Ltd.