Development of the simulation softwares for transient to steady flows due to phase change processes

开发相变过程引起的瞬态到稳态流动的模拟软件

• 批准号: 14550153
• 负责人: ONISHI Yoshimoto
• 金额: $ 1.79万
• 依托单位: Tottori University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550153/
• 关键词: phase change processes; Fluid Dynamic Formulation; Boltzmann equation; condensable and noncondensable gas mixture; shock waves, contact regions; condensed phase with internal structure; Numerical simulations; 膨脹波、膨脹領域; 流体学力学的定式化; 構造をもつ凝縮相; 膨張波、膨

Simulation softwares (programs) for transient to steady motions of a vapor or a vapor-gas mixture have been developed, although the user-interface of the softwares is yet not good enough. The softwares, however, can cope with practical flow situations and can give useful information for the designs of various practical mass, heat and energy transfer systems. These simulation softwares are able to deal with appropriately the transitional processes of the flow fields in which the shock waves and contact regions (sometimes expansion waves involved), which are produced associated with these phase change processes, are propagating and bringing the flow fields to their final states. Of course, the problems of this kind should be based on the kinetic equations because of the nonequilibrium regions involved in the flow fields. The present softwares, however, are based on the governing system at the ordinary fluid dynamic level, the so-called fluid dynamic formulation, which consists of the com … More pressible Navier-Stokes equations subject to the appropriate boundary conditions at the condensed phases derived from the kinetic theory analysis done earlier by the head investigator. This fluid dynamic formulation is equivalent to the kinetic system for small Knudsen numbers, enabling us to treat at ordinary fluid dynamic level various flow problems associated with phase change processes of arbitrary strength. Some of the simulation results based on this fluid_dynamic_formulation are, of course, compared with and confirmed by the corresponding results based on the kinetic equation.Simulation softwares (programs) for transient to steady motions of a vapor or a vapor-gas mixture have been developed, although the user-interface of the softwares is yet not good enough. The softwares, however, can cope with practical flow situations and can give useful information for the designs of various practical mass, heat and energy transfer systems. These simulation softwares are able to deal with appropriately the transitional processes of the flow fields in which the shock waves and contact regions (sometimes expansion waves involved), which are produced associated with these phase change processes, are propagating and bringing the flow fields to their final states. Of course, the problems of this kind should be based on the kinetic equations because of the nonequilibrium regions involved in the flow fields. The present softwares, however, are based on the governing system at the ordinary fluid dynamic level, the so-called fluid dynamic formulation, which consists of the compressible Navier-Stokes equations subject to the appropriate boundary conditions at the condensed phases derived from the kinetic theory analysis done earlier by the head investigator. This fluid dynamic formulation is equivalent to the kinetic system for small Knudsen numbers, enabling us to treat at ordinary fluid dynamic level various flow problems associated with phase change processes of arbitrary strength. Some of the simulation results based on this fluid dynamic formulation are, of course, compared with and confirmed by the corresponding results based on the kinetic equation. Less

蒸汽或蒸汽-气体混合物从瞬态到稳态运动的模拟软件（程序）已经开发出来，尽管这些软件的用户界面还不够好。然而，这些软件可以处理实际的流动情况，并可以为各种实际质量，热量和能量传递系统的设计提供有用的信息。这些模拟软件能够适当地处理流场的过渡过程，其中与这些相变过程相关的激波和接触区（有时涉及膨胀波）正在传播并使流场达到最终状态。当然，由于流场中涉及到非平衡区，这类问题必须以动力学方程为基础。然而，目前的软件是基于普通流体动力学水平上的控制系统，即所谓的流体动力学公式，它由更可能的纳维-斯托克斯方程组成，服从于适当的边界条件，这是由首席研究员先前所做的动力学理论分析得出的。这种流体动力学公式相当于小Knudsen数的动力学系统，使我们能够在普通流体动力学水平上处理与任意强度相变过程相关的各种流动问题。当然，基于该流体动力学公式的一些模拟结果与基于动力学方程的相应结果进行了比较并得到了证实。蒸汽或蒸汽-气体混合物从瞬态到稳态运动的模拟软件（程序）已经开发出来，尽管这些软件的用户界面还不够好。然而，这些软件可以处理实际的流动情况，并可以为各种实际质量，热量和能量传递系统的设计提供有用的信息。这些模拟软件能够适当地处理流场的过渡过程，其中与这些相变过程相关的激波和接触区（有时涉及膨胀波）正在传播并使流场达到最终状态。当然，由于流场中涉及到非平衡区，这类问题必须以动力学方程为基础。然而，目前的软件是基于普通流体动力学水平的控制系统，即所谓的流体动力学公式，它由可压缩的Navier-Stokes方程组成，该方程服从于由首席研究员先前所做的动力学理论分析得出的凝聚态的适当边界条件。这种流体动力学公式相当于小Knudsen数的动力学系统，使我们能够在普通流体动力学水平上处理与任意强度相变过程相关的各种流动问题。当然，基于该流体动力学公式的一些模拟结果与基于动力学方程的相应结果进行了比较和证实。少

项目成果

Y.Onishi, T.Ooshida, T.Hashimoto, H.Takahashi: "Flows around two spherical condensed phases due to the interaction with a shock wave"Reports of the Faculty of Engineering, Tottori University. Vol.34. 85-90 (2003)

Y.Onishi、T.Ooshida、T.Hashimoto、H.Takahashi：“由于与冲击波的相互作用而在两个球形凝聚相周围流动”鸟取大学工学部的报告。

Yoshimoto Onishi, Ken Yamada: "Evaporation and Condensation from or onto the Condensed Phase with an Internal Structure"Rarefied Gas Dynamics. 6630-6637 (2003)

Yoshimoto Onishi、Ken Yamada：“具有内部结构的凝相的蒸发和凝结”稀薄气体动力学。

大西 善元, 山田 健, 渡邊信義, 中島 俊: "温度場構造をもつ平行平面凝縮相間の蒸発・凝縮流れ--流体力学的定式化に基づくシミュレーション--"鳥取大学工学部研究報告. 34. 91-98 (2003)

Yoshimoto Onishi、Ken Yamada、Nobuyoshi Watanabe、Shun Nakajima：“具有温度场结构的平行平面冷凝相之间的蒸发和冷凝流动--基于流体动力学公式的模拟--”鸟取大学工学部研究报告34。 91 -98（ 2003）

Yoshimoto Onishi, Ken Yamada: "Evaporation and Condensation from or onto the Condensed Phase with an Internal Structure"Rarefied Gas Dynamics,(edited by A.D.Ketsdever and E.P.Muntz)(American Institute of Physics, U.S.A.). 630-637 (2003)

Yoshimoto Onishi、Ken Yamada：“具有内部结构的凝相的蒸发和凝结”稀薄气体动力学，（由 A.D.Ketsdever 和 E.P.Muntz 编辑）（美国物理研究所，美国）。

Y.Onishi, K.Yamada, N.Watanabe, T.Nakajima: "Evaporation and condensation flows of a vapor between the condensed phases with temperature fields as their internal structures -A simulation based on the Fluid Dynamic Formulation -"Reports of the Faculty of E

Y.Onishi、K.Yamada、N.Watanabe、T.Nakajima：“以温度场为内部结构的凝相之间的蒸气的蒸发和凝结流动 - 基于流体动力学公式的模拟 -”学院的报告