标题： 两组分喷流模拟：结合解析和数值方法 显示英文标题

标题： Two-component jet simulations: Combining analytical and numerical approaches

摘要： 最近的观测以及对YSO喷流的理论研究表明存在两个稳定的组分：一种是盘风类型的流出，用于解释观测到的高质量损失率，另一种是恒星风类型的流出，可能解释了观测到的恒星自转减慢现象。 在此框架下，我们通过适当混合解析盘风解与互补的解析恒星流出，构建数值的双组分喷流模型。 它们的组合由空间和时间参数控制，以应对不同的物理条件和时间变化特征。 我们研究了两个喷流组分在小尺度和大尺度上的时间演化和相互作用。 模拟达到了接近初始解的稳定状态配置。 尽管时间变化似乎并未显著影响动力学，但流动波动产生了凝聚物，其大尺度结构与观测到的YSO喷流结有很强的相似性。 显示英文摘要

摘要： Recent observations as well as theoretical studies of YSO jets suggest the presence of two steady components: a disk wind type outflow needed to explain the observed high mass loss rates and a stellar wind type outflow probably accounting for the observed stellar spin down. In this framework, we construct numerical two-component jet models by properly mixing an analytical disk wind solution with a complementary analytically derived stellar outflow. Their combination is controlled by both spatial and temporal parameters, in order to address different physical conditions and time variable features. We study the temporal evolution and the interaction of the two jet components on both small and large scales. The simulations reach steady state configurations close to the initial solutions. Although time variability is not found to considerably affect the dynamics, flow fluctuations generate condensations, whose large scale structures have a strong resemblance to observed YSO jet knots.