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首页> 外文期刊>British Journal of Mathematics & Computer Science >Large Eddy Simulation of Turbulent Channel Flow Using Smagorinsky Model and Effects of Smagorinsky Constants
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Large Eddy Simulation of Turbulent Channel Flow Using Smagorinsky Model and Effects of Smagorinsky Constants

机译：使用Smagorinsky模型和Smagorinsky常数影响的湍流通道大涡模拟

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A large eddy simulation (LES) of a turbulent channel flow is performed by using the Smagorinsky subgrid scale model and the effects of Smagorinsky constants in LES are discussed. The computation is performed in the domain of 2πδ x 2δ x πδ with 32 x 64 x 32 grid points at a Reynolds number Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} Reτ = 590 based on the channel half width, δ and wall shear velocity, {C} {C} Normal 0 false false false EN-US X-NONE X-NONE {C} {C} /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} uτ . The performance of the Smagorinsky model is tested in LES for three values of Smagorinsky constant, {C} {C} Normal 0 false false false EN-US X-NONE X-NONE {C} {C} /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman","serif";} CS = 0.065, 0.1 and 0.13, and for all three cases the computed essential turbulence statistics of the flow field are compared with Direct Numerical Simulation (DNS) data. Comparing the results with those from DNS data throughout the whole calculation domain we have found that turbulence statistics for CS = 0.065 show reasonable agreement with the DNS data. Agreements as well as discrepancies are discussed. The behavior of the flow structures in the computed flow field has also been discussed. Normal 0 false false false EN-US X-NONE X-NONE.
机译：通过使用Smagorinsky子网格比例模型对湍流通道进行大涡模拟（LES），并讨论了LES中Smagorinsky常数的影响。该计算是在2πδx2δxπδ的域中执行的，其中的雷诺数为32 x 64 x 32格点雷诺数正常0假假否EN-US X-NONE X-NONE / *样式定义* / table.MsoNormalTable {mso -style-name：“普通表”; mso-tstyle-rowband-size：0; mso-tstyle-colband-size：0; mso-style-noshow：是; mso-style-priority：99; mso-style-qformat：是; mso-style-parent：“”; mso-padding-alt：0in 5.4pt 0in 5.4pt; mso-para-margin：0in; mso-para-margin-bottom：.0001pt; mso分页：寡妇孤儿;字体大小：10.0pt; font-family：“ Times New Roman”，“ serif”;} Re τ = 590基于通道半宽度δ和壁剪切速度，{C} {C}正常0假假假ZH-CN X-NONE X-NONE {C} {C} / *样式定义* / table.MsoNormalTable {mso-style-name：“ Table Normal”; mso-tstyle-rowband-size：0; mso-tstyle-colband-size：0; mso-style-noshow：是; mso-style-priority：99; mso-style-qformat：是; mso-style-parent：“”; mso-padding-alt：0in 5.4pt 0in 5.4pt; mso-para-margin：0in; mso-para-margin-bottom：.0001pt; mso分页：寡妇孤儿;字体大小：10.0pt; font-family：“ Times New Roman”，“ serif”;} u τ。在LES中针对Smagorinsky常数的三个值，{C} {C}正常0否否否EN-US X-NONE X-NONE {C} {C} / *样式定义* /表，在LES中测试了Smagorinsky模型的性能。 .MsoNormalTable {mso-style-name：“ Table Normal”; mso-tstyle-rowband-size：0; mso-tstyle-colband-size：0; mso-style-noshow：是; mso-style-priority：99; mso-style-qformat：是; mso-style-parent：“”; mso-padding-alt：0in 5.4pt 0in 5.4pt; mso-para-margin：0in; mso-para-margin-bottom：.0001pt; mso分页：寡妇孤儿;字体大小：10.0pt; font-family：“ Times New Roman”，“ serif”;} C S = 0.065、0.1和0.13，并且对于所有这三种情况，将计算出的流场基本湍流统计量与直接数值进行比较模拟（DNS）数据。将结果与整个计算域中DNS数据的结果进行比较，我们发现C S = 0.065的湍流统计数据与DNS数据具有合理的一致性。讨论了协议以及差异。还讨论了流动结构在计算流场中的行为。正常0否否否EN-US X-NONE X-NONE。

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