使用发展的大涡模拟并行程序,数值模拟了圆形射流湍流场,与实验值进行详细比较,对大涡模拟程序进行检验,并分析网格尺度对计算结果的影响。结果表明,大涡模拟计算的平均速度场和雷诺应力场与实验值符合得非常好,验证了该大涡模拟计算程序的可靠性和精确度。同时发现一阶统计矩受网格尺度影响不大,二阶及高阶矩与网格尺度有较大的关系,因此使用大涡模拟方法计算湍流及湍流燃烧问题应对网格依赖性进行必要分析,至少保证二阶统计矩具有较好的精度。
The circular jet was numerically simulated by the developed parallel programme based on the large eddy simulation（LES） method.The LES results were compared with the experiments to check the programme and analyze the effects of the mesh scale.The results show that the mean velocity and Reynolds stress calculated by LES agree well with those measured by the experiments and can be proved reliable and precise.The results also show that the mesh scale affects the first standardized moment little but the second and third standardized moments much.So it＇s necessary to analyze the LES results with the dependence on the mesh scale to guarantee the second standardized moment precise at least when simulating the turbulent flow and turbulent combustion.
参考文献
| [1] | Pitsch H .Large-eddy simulation of turbulent combustion[J].Annual Review of Fluid Mechanics,2006(0):453-482. |
| [2] | Ping Wang;Jochen Froehlich;Vittorio Michelassi;Wolfgang Rodi .Large-eddy simulation of variable-density turbulent axisymmetric jets[J].International journal of heat and fluid flow,2008(3):654-664. |
| [3] | Venkatramanan Raman;Heinz Pitsch .Large-eddy simulation of a bluff-body-stabilized non-premixed flame using a recursive filter-refinement procedure[J].Combustion and Flame,2005(4):329-347. |
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