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Flow and heat transfer in cross-stream type T-junctions: A computational study

机译:横流式T型接头的流动和传热:计算研究

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摘要

The present computational study is concerned with the thermal mixing of flow-crossing streams in a T-shaped junction, focussing primarily on a configuration subjected to temperature-dependent fluid property conditions. The reference experimental investigation is conducted by Hirota et al. (2010). Preliminary, a quasi two-dimensional configuration with constant fluid properties, for which the reference DNS (Direct Numerical Simulation) database is made available by Hattori et al. (2014), is simulated. The presently applied computational model is based on a VLES (Very Large Eddy Simulation) formulation of Chang et al. (2014). The residual turbulence is modeled employing the appropriately modified RANS-based (Reynolds-Averaged Navier-Stokes) elliptic-relaxation eddy-viscosity model of Hanjalic et al. (2004). In addition to the VLES, both flow configurations are computed applying the background BANS model representing the constituent of the present VLES method. Whereas the eddy viscosity model describes fully-modeled turbulence in the BANS framework, it relates to the unresolved sub-scale turbulence within the VLES methodology. Unlike the BANS method, the VLES method is capable of capturing the spectral dynamics of turbulence to an extent complying with the underlying grid resolution. The latter model feature contributes decisively to an appropriately intensified turbulence activity in the separated shear layer regions and, consequently, to an enhanced mixing process, The results obtained with the present VLES model follow closely the reference DNS data in the Hattori et al. (2014) case with respect to velocity and temperature fields as well as the fields of associated turbulent quantities in all characteristic regions of the flow domain: main and branch streams' merging zone, flow-reversal and post-reattachment regions. In the more complex Hirota et al. (2010) configuration, the flow field is captured reasonably well, while the computationally obtained thermal fields suggest a somewhat more intensive mixing relative to the reference experiment.
机译:当前的计算研究涉及在T形连接处的交叉流动的热混合,主要集中在受温度影响的流体特性条件下。参考实验研究由Hirota等人进行。 (2010)。初步的,具有恒定流体特性的准二维配置,Hattori等人为其提供了参考DNS(直接数值模拟)数据库。 (2014年)进行了模拟。当前应用的计算模型基于Chang等人的VLES(超大型涡流仿真)公式。 (2014)。使用Hanjalic等人的适当修改的基于RANS的(Reynolds平均Navier-Stokes)椭圆松弛松弛涡流粘度模型对残余湍流进行建模。 (2004)。除了VLES之外,还使用代表当前VLES方法组成部分的背景BANS模型来计算两种流量配置。尽管涡流粘度模型在BANS框架中描述了完全建模的湍流,但它与VLES方法中未解决的小尺度湍流有关。与BANS方法不同,VLES方法能够捕获湍流的光谱动力学,其程度符合基本的网格分辨率。后一个模型特征对分离的剪切层区域中适当增强的湍流活动起决定性作用,并因此对增强混合过程起着决定性作用。使用本VLES模型获得的结果与Hattori等人的参考DNS数据密切相关。 (2014年)的案例涉及速度和温度场以及流域所有特征区域中相关湍流量的场:主流和支流的合并区,逆流和后附着区。在更复杂的广田等。 (2010年)配置,流场被很好地捕获,而通过计算获得的热场表明相对于参考实验,混合强度更高。

著录项

  • 来源
    《International Journal of Heat and Fluid Flow》 |2018年第6期|179-188|共10页
  • 作者单位

    Tech Univ Darmstadt, Inst Fluid Mech & Aerodynam, Alarich Weiss Str 10, D-64287 Darmstadt, Germany;

    Tech Univ Darmstadt, Inst Fluid Mech & Aerodynam, Alarich Weiss Str 10, D-64287 Darmstadt, Germany;

    Tech Univ Darmstadt, Inst Fluid Mech & Aerodynam, Alarich Weiss Str 10, D-64287 Darmstadt, Germany;

    Tech Univ Darmstadt, Inst Fluid Mech & Aerodynam, Alarich Weiss Str 10, D-64287 Darmstadt, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Very large eddy simulation; Hybrid RANS/LES; T-junction; Turbulence; Heat transfer;

    机译:超大型涡模拟;混合RANS / LES;T型结;湍流;传热;
  • 入库时间 2022-08-18 02:59:41

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