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首页> 外文期刊>Engineering Applications of Computational Fluid Mechanics >Development of Non-Reflecting Boundary Condition for Application in 3D Computational Fluid Dynamics Codes
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Development of Non-Reflecting Boundary Condition for Application in 3D Computational Fluid Dynamics Codes

机译：非反射边界条件在3D计算流体力学代码中的应用

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AbstractNumerical computations are commonly used for better understanding the unsteady processes in internal combustion engine components and their acoustic behavior. The acoustic characterization of a system requires that reflections from duct terminations are avoided, which is achieved either by using highly dissipative terminations or, when an impulsive excitation is used, by placing long ducts between the system under study and the duct ends. In the latter case, the simulation of such a procedure would require a large computational domain with the associated high computational cost, unless non-reflecting boundary conditions are used. In this paper, first the different non-reflecting boundary conditions available in ANSYS-FLUENT are evaluated. Then, the development and implementation of an anechoic termination in a 3D-CFD code is presented. The performance of the new implementation is first validated in the classic Sod’s shock tube problem, and then checked against numerical and experimental results of...
机译：摘要数值计算通常用于更好地了解内燃机组件中的不稳定过程及其声学特性。系统的声学特性要求避免来自管道终端的反射，这可以通过使用高度耗散的终端来实现，也可以在使用脉冲激励时通过在被研究系统和管道末端之间放置长管道来实现。在后一种情况下，除非使用非反射边界条件，否则此过程的仿真将需要较大的计算域以及相关的高计算成本。本文首先评估了ANSYS-FLUENT中可用的不同非反射边界条件。然后，介绍了3D-CFD代码中消声终端的开发和实现。新实现的性能首先在经典的Sod减震管问题中得到验证，然后根据...的数值和实验结果进行检查。

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