具有不连续截面喷嘴中流体流动的最小熵原理
The minimum entropy principle for fluid flows in a nozzle with discontinuous cross-section
AI总结:
针对变截面且可能含有不连续性的喷嘴中的可压缩流体欧拉方程,将其视为非守恒形式双曲系统,基于Dal Maso、LeFloch和Murat意义下的弱解,利用熵等式的完全守恒形式推导熵解满足的最小熵原理,并建立该类数值逼近的稳定性。
摘要:
我们考虑喷嘴中可压缩流体的欧拉方程,其截面是可变的且可能包含不连续性。我们将这些方程视为非守恒形式的双曲系统,并研究Dal Maso、LeFloch和Murat意义下的弱解。观察到熵等式具有完全守恒的形式,我们推导了熵解满足的最小熵原理。然后我们建立了该类系统数值逼近的稳定性。
英文摘要:
We consider the Euler equations for compressible fluids in a nozzle whose cross-section is variable and may contain discontinuities. We view these equations as a hyperbolic system in nonconservative form and investigate weak solutions in the sense of Dal Maso, LeFloch, and Murat. Observing that the entropy equality has a fully conservative form, we derive a minimum entropy principle satisfied by entropy solutions. We then establish the stability of a class of numerical approximations for this system.
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