fluent噪声培训资料(中)

Tu torial: Broadband Noise ModelingPu rposeThe purpose of this tutorial is to provide guidelines and recommendations for the basicsetup and solution procedure for solving an acoustics field generated from a sedan car usingthe broadband noise model. The problem is initially solved for steady state, and then thebroadband acoustic model is included in the calculation to perform postprocessing.Prerequ isitesThis tutorial assumes that you are familiar with the user interface, basic setup and solutionprocedures in FLUENT. This tutorial does not cover mechanics of using the broadband noisemodel, but focuses on setting up the problem for a sedan car and performing postprocessing.It also assumes that you have a basic understanding of aeroacoustic physics.If you have not used FLUENT before, it would be helpfulto first review FLUENT 6.2 User’sGuide and FLUENT 6.2 Tutorial Guide.Problem DescriptionThe problem involves a sedan car model as shown in Figure 1. The car is traveling at 70miles per hour. You will study only the acoustics field generated by the motion of the carto highlight the noise source on the sedan body, therefore the mirrors and the wheels of thecar are ignored.Figure 1: The Sedan CarcFlu ent Inc. March 18, 20051Broadband Noise ModelingPreparation1. Copy the mesh file, sedan-acoustics.msh from the input file into your working di-rectory.2. Start the 3D version of FLUENT.Setu p and Solu tionStep 1: Grid1. Read the mesh file, sedan-acoustics.msh.File −→ Read −→Case...2. Check the grid.Grid −→Check...3. Keep default scale for the grid.Grid −→Scale...4. Displaythe grid.Display −→Grid...GridFLUENT 6.2 (3d, segregated, lam)ZYXFigure 2: Grid Display2cFlu ent Inc. March 18, 2005Broadband Noise ModelingSt...