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原文传递 EXAMINATION OF THE PCICE METHOD IN THE NEARLY INCOMPRESSIBLE, AS WELL AS STRICTLY INCOMPRESSIBLE, LIMITS

题名：	EXAMINATION OF THE PCICE METHOD IN THE NEARLY INCOMPRESSIBLE, AS WELL AS STRICTLY INCOMPRESSIBLE, LIMITS
作者：	Richard C. Martineau;Ray A. Berry;
关键词：	compressible; incompressible; PCICE; pressure based; transient fluid flows70 - PLASMA PHYSICS AND FUSION TECHNOLOGY; ALGORITHMS; COMPRESSIBILITY; FLUID FLOW; HEAT FLUX; NATURAL CONVECTION; NUCLEAR ENGINEERING; POISSON EQUATION; TRANSIENTS; VELOCITY
摘要：	The conservative-form, pressure-based PCICE numerical method (Martineau and Berry, 2004) (Berry, 2006), recently developed for computing transient fluid flows of all speeds from very low to very high (with strong shocks), is simplified and generalized. Though the method automatically treats a continuous transition of compressibility, three distinct, limiting compressibility regimes are formally defined for purposes of discussion and comparison with traditional methods 鈥?the strictly incompressible limit, the nearly incompressible limit, and the f ully compressible limit. The PCICE method鈥檚 behavior is examined in each limiting regime. In the strictly incompressible limit the PCICE algorithm reduces to the traditional MAC-type method with velocity divergence driving the pressure Poisson equation. In the nearly incompressible limit the PCICE algorithm is found to reduce to a generalization of traditional incompressible methods, i.e. to one in which not only the velocity divergence effect, but also the density gradient effect isincluded as a driving function in the pressure Poisson equation. This nearly incompressible regime has received little attention, and it appears that in the past, strictly incompressible methods may have been conveniently applied to flows in this regime at the expense of ignoring a potentially important coupling mechanism. This could be significant in many important flows; for example, in natural convection flows resulting from high heat flux.In the f ully compressible limit or regime, the algorithm is found to reduce to an expression equivalent to density-based methods for high-speed flow.
报告类型：	科技报告