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首页> 外文会议>National Fluid Mechanics and Fluid Power Conference >Unsteady RANS computations of supersonic flow over two dimensional cavity using OpenFOAM - A validation study
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Unsteady RANS computations of supersonic flow over two dimensional cavity using OpenFOAM - A validation study

机译：使用OpenFoam的二维空腔超声波流量的不稳定rans计算 - 验证研究

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摘要

This work attempts to establish OpenFOAM [1] as a suitable software platform for computing supersonic flows over cavities with the objective of using it in numerical simulation of unsteady flow in the Scramjet strut cavity. As a bench marking exercise, external supersonic flow over a 2-D cavity, of l/d = 5 at Mach no. 1.5 and Reynolds no. 1.09×10~6(based on length of cavity) was chosen. Numerical simulation of this geometry was perfomed in OpenFOAM using the transient supersonic flow solver sonicTurbFoam. The results were compared with experiments done by Kaufmann et al, and numerical simulations done by Shihand Rizzetta. Co-efficient of pressure on the walls of cavity were found to agree qualitatively. OASPL predicted by OpenFOAM on the cavity floor were found to be 20dB higher than that computed by Shih et al and Rizetta et al, while OASPL on the aft wall and fore wall predicted by Open-FOAM was lower by 20dB. Spectrum of the pressure signal at two points on the floor and one point on the aft wall were also compared. The resolution of the modes were good while the sound pressure levels were about 20dB higher.
机译：这项工作试图建立OpenFoam [1]作为用于计算超音速流过空腔的合适软件平台，其目的是在扰刺支撑腔中的不稳定流动的数值模拟中使用它。作为替补标记运动，外部超声波在2-D腔上流动，L / D = 5在马赫号。 1.5和雷诺兹没有。选择1.09×10〜6（基于腔长）。这种几何形状的数值模拟使用瞬态超音速求解器Sonicurbfoam在OpenFoam中进行。将结果与Kaufmann等人进行的实验进行了比较，并通过志工Rizzetta完成的数值模拟。发现腔壁上的压力的共同效率定性。发现OpenFoam在腔底层上预测的OASPL比Shih等人和Rizetta等人计算的高于20dB，而通过开孔预测的尾壁和前壁上的OASPL较低20dB。还比较了地板上的两个点的压力信号的光谱，并比较了后壁上的一个点。模式的分辨率良好，而声压水平率高约为20dB。

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