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首页> 外文会议>The 2001 ASME International Mechanical Engineering Congress and Exposition, 2001, Nov 11-16, 2001, New York, New York >FREE SURFACE TRACKING AND STEADY/UNSTEADY COMPUTATIONAL SIMULATIONS FOR INTERNAL CONDENSING FLOWS
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FREE SURFACE TRACKING AND STEADY/UNSTEADY COMPUTATIONAL SIMULATIONS FOR INTERNAL CONDENSING FLOWS

机译：内部凝结水流的自由表面跟踪和稳态/非稳态计算模拟

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摘要

The computational investigation in this paper explores a new technique for steady and unsteady internal condensing flows in the annular/stratified regime. Simulation capabilities for both steady and unsteady interface laminar/laminar situations are presented for film condensation on the bottom wall of a small-to-moderate gap channel. The unsteady simulations employ a suitable adaptive grid and the solution of an interface tracking hyperbolic equation (of the type used in level-set or VOF methods). At each time-step, the scheme locates the interface, solves the Navier-Stokes equation in each phase, satisfies the full non-linear conditions at the phase change interface, and satisfies the necessary inlet, outlet, and wall conditions. The stability and instability of various exit condition dependent steady solutions are inferred from direct unsteady simulations and this leads to insights into the flow mechanisms that determine the eventual quasi-steady flows. For some cases it is found that waviness and heat transfer rates are enhanced significantly by the flow's sensitivity to the frequency content of persistent noise in the inlet data.
机译：本文的计算研究探索了一种用于环状/分层状态下稳态和非稳态内部冷凝流的新技术。提出了针对稳态和非稳态界面层流/层流情况的仿真功能，以在中小间隙通道的底壁上凝结薄膜。非稳态仿真采用合适的自适应网格和接口跟踪双曲方程（在水平集或VOF方法中使用的类型）的解决方案。该方案在每个时间步都定位界面，在每个相中求解Navier-Stokes方程，在相变界面处满足全部非线性条件，并满足必要的入口，出口和壁面条件。从直接的非稳态模拟中可以推断出各种依赖于出口条件的稳态解的稳定性和不稳定性，这导致了对确定最终准稳态流动的流动机理的认识。在某些情况下，发现波流和传热速率由于流动对入口数据中持续性噪声的频率含量的敏感性而显着提高。

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