The capability of the INS3D-UP code in the prediction of turbulent flow in a sharp bend of circular cross-section has been investigated. The code, developed by the NASA Ames Research Center, is being used by the NASA Marshal Space Flight Center to analyze turbulent flow of liquid propellant in vaned pipe bends designed for use in the Space Shuttle Main Engine. The FORTRAN code is based on finite difference method and uses the concept of pseudocompressibility to solve incompressible Navier-Stokes equation. The Baldwin-Barth turbulence model is embedded in the code for turbulence computation. The flow field, at a Reynolds number of 43,000, in a sharp 90° bend has been predicted and compared with measurement. It is found that the agreement between the predicted and measured velocities is very well. The predicted pressures at the bend wall also compares reasonably well with the measurement. It is concluded that the INS3D-UP code is a good computational tool to analyze similar flow problems.
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机译：研究了INS3D-UP代码在圆形横截面急剧弯曲中预测湍流中的能力。美国宇航局AMES研究中心开发的代码是由美国宇航局的Marshal Space Flight Centre使用，分析虚拟管道弯管中的液体推进剂的湍流，该弯管设计用于空间班车主发动机。 FORTRAN代码基于有限差分方法，并使用伪变性功能的概念来解决不可压缩的Navier-Stokes方程。 Baldwin-Barth湍流模型嵌入在湍流计算代码中。在急剧90°弯曲中，在雷诺数为43,000的流场，并与测量相比。发现预测和测量速度之间的协议非常好。弯曲墙的预测压力也与测量相比相当良好。得出结论，INS3D-UP代码是一种良好的计算工具，用于分析类似的流动问题。
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