Version 2.2 Aug 2010
User’s Manual for OVERFLOW 2.2

Robert H. Nichols
University of Alabama, Birmingham
Birmingham, AL 35294
Pieter G. Buning
NASA Langley Research Center
Hampton, VA 23681

Table of Contents
1. Introduction
1.1 Code History
1.2 OVERFLOW 2.2 Capabilities
1.3 Navier-Stokes Equation Implicit Solution Procedure
1.4 Low-Mach Number Preconditioning
1.5 Species Equations
1.6 Non-Dimensional Flow Variables

2. Requesting and Compiling OVERFLOW 2.2

2.2 Obtaining OVERFLOW 2.2
2.2 Compiling OVERFLOW 2.2
2.3 Recommended Companion Software
2.4 OVERFLOW Mailing List

3. OVERFLOW-Mode Operation

3.1 Required Input Files
3.2 Force/Moment Integration
3.3 NAMELIST Inputs
3.4 Turbulence Model Specifications
3.5 Variable γ and Multispecies
3.6 Boundary Condition Specification
3.7 Unsteady Flow Output Options
3.8 Initializing the Solution
3.9 Running the Code
3.10 Test Cases

4. OVERFLOW-D-Mode Operation Without Grid Movement

4.1 Near-Body Grid Generation
4.2 Off-Body Grid Generation
4.3 X-Ray Specification
4.4 Grid Assembly using DCF
4.5 Grid Adaptation to Solution Error

5. OVERFLOW-D-Mode Operation With Grid Movement

5.1 Body Motion Non-Dimensionalization
5.2 Six-Degree-of-Freedom Motion Using &SIXINP
5.3 GMP XML Specification
5.4 GMP Prescribed Motion
5.5 GMP 6-DOF Motion
5.6 Using overgrid to Preview GMP Body Motion 2
5.7 Simulating Body Collisions
5.8 Moving-Body Output Files
5.9 Grid Adaptation to Body Motion

6. Debugging Tools

6.1 Turbulence Model Diagnostics (DEBUG=1)
6.2 Time Step Diagnostics (DEBUG=2)
6.3 Residual Diagnostics (DEBUG=3)
6.4 Solution Adaption Information (DEBUG=4)

7. Utility Codes


Appendix A. File Formats
Appendix B. NAMELIST Input       Latest Namelist Version 2.2
Appendix C. Boundary Condition Types
Appendix D. Viscous Region Specification
Appendix E. Rotorcraft Simulations (future)