General Numerical Procedure for the Treatment of Moving Interfaces in Implicit Continuous Eulerian (ICE) Hydrodynamics

摘要

The implicit continuous Eulerian (ICE) finite difference method in hydrodynamic computations has proven very successful when applied to flow situations in which there are excessive fluid distortions. Code logic becomes exceedingly complex, however, if the boundaries of the fluid domain are material interfaces whose orientations with respect to the Eulerian grid evolve during the calculation. It is shown in this article that within the ICE methodology it is possible to express the discrete mass conservation condition in an identical form for all computational cells, even those containing, or close to, moving fluid boundaries. From this basis a generalized ICE algorithm is built up alleviating many of the difficulties associated with complicated configurations of free and structure boundaries. In particular, an effective treatment of slug impact with fluid-structure interaction is readily formulated. To illustrate the technique in practical situations, the method has been incorporated into a version of the coupled fluid-structure code SEURBNUK-EURDYN, used for LMFBR safety analysis, and a number of fluid-gas, fluid-structure situations are analyzed. Results are compared with analytic solutions, experimental measurement, and/or other code predictions, as appropriate. Two oblique, slug impact situations are included. (author) 37 refs., 24 figs. (Atomindex citation 20:008508)