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Wind-Us Users Guide: by National Aeronautics and Space Administration

By National Aeronautics and Space Administration

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Book Id: WPLBN0000660101
Format Type: PDF eBook
File Size: 1.50 MB
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Title: Wind-Us Users Guide: by National Aeronautics and Space Administration  
Author: National Aeronautics and Space Administration
Volume:
Language: English
Subject: Government publications, National Aeronautics and Space Administration (U.S.), NASA reference publication
Collections: NASA Publication Collection
Historic
Publication Date:
Publisher: National Aeronautics and Space Administration Publication

Citation

APA MLA Chicago

And Space Administration, N. A. (n.d.). Wind-Us Users Guide. Retrieved from http://community.worldlibrary.net/


Excerpt
Description: This document contains information regarding topics such as ACCELERATE Convergence Acceleration (Block), ACTUATOR/SCREEN Discontinuous Change Across A Zone Boundary (Block), and ARBITRARY INFLOW Arbitrary Inflow (Block).

Table of Contents
Contents 1 Introduction 1 1.1 Mathematical Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Geometry and Mesh Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Numerical Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.4 Coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 Tutorial 3 2.1 Gather Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1.1 Geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1.2 Flow Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1.3 Boundary Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Create the Computational Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.1 General Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.2 Creating the Common Grid (.cgd) File . . . . . . . . . . . . . . . . . . . . . . 6 2.2.3 Test Case 4 Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Define the Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3.1 Descriptive Header and Comments . . . . . . . . . . . . . . . . . . . . . . . . 11 2.3.2 Boundary Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3.3 Flow and Initial Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3.4 Physical Model Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3.5 Numerical Model Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.3.6 Test Case 4 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.4 Run the Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.4.1 The wind Script . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.4.2 Parallel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.4.3 Running Test Case 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2.5 Monitor Convergence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.5.1 Test Case 4 Convergence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.6 Examine the Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2.6.1 Using CFPOST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2.6.2 Test Case 4 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2.7 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 3 Geometry and Flow Physics Modeling 29 3.1 Symmetry Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.1.1 Three-Dimensional Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.1.2 Two-Dimensional Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.1.3 Area Variation (Quasi-3D) Cases . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.1.4 Axisymmetric Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 3.2 Euler and Navier-Stokes Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.2.1 Freestream Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.2.2 Reynolds Number Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.2.3 Mass Flow in Two-Dimensional Calculations . . . . . . . . . . . . . . . . . . 32 3.2.4 Mass Flow and Grid Areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 3.2.5 Heat Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.2.6 Viscosity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.3 Turbulence Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 3.3.1 Algebraic Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 3.3.2 One-Equation Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

 

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