气动噪音仿真(fluent)
28页1、Tutorial: Modeling Flow-Induced (Aeroacoustic) Noise Problems Using FLUENT Introduction This tutorial demonstrates how to model 2D turbulent fl ow across a circular cylinder using large eddy simulation (LES) and compute fl ow-induced (aeroacoustic) noise using FLUENTs acoustics model. You will learn how to: Perform a 2D large eddy simulation. Set parameters for an aeroacoustic calculation. Save acoustic source data for an acoustic calculation. Calculate acoustic pressure signals. Postprocess aer
2、oacoustic results. Prerequisites This tutorial assumes that you are familiar with the FLUENT interface and that you have a good understanding of basic setup and solution procedures. Some steps will not be shown explicitly. In this tutorial you will use the acoustics model. If you have not used this feature before, fi rst read Chapter 21, Predicting Aerodynamically Generated Noise, of the FLUENT 6.2 Users Guide c? Fluent Inc. May 11, 20051 Modeling Flow-Induced (Aeroacoustic) Noise Problems Using
3、 FLUENT Problem Description The problem considers turbulent air fl ow over a 2D circular cylinder at a free stream ve- locity (U) of 69.2 m/s. The cylinder diameter (D) is 1.9 cm. The Reynolds number based on the diameter is 90,000. The computational domain (Figure 1) extends 5D upstream and 20D downstream of the cylinder. U = 69.2 m/s D = 1.9 cm Figure 1: Computational Domain Preparation 1. Copy the fi le cylinder2d.msh to your working directory. 2. Start the 2D version of FLUENT. Approximately
4、 2.5 hours of CPU time is required to complete this tutorial.If you are interested exclusively in learning how to set up the acoustics model, you can reduce the computing time requirements considerably by starting at Step 7 and using the provided case and data fi les. 2c? Fluent Inc. May 11, 2005 Modeling Flow-Induced (Aeroacoustic) Noise Problems Using FLUENT Step 1: Grid 1. Read the grid fi le cylinder2d.msh. File Read Case. As FLUENT reads the grid fi le, it will report its progress in the co
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