Additional PAB3D information

 


 

 

 

PAB3D

A 3-D Navier-Stokes CFD System

UPMS graphics


 

UPMS graphics


Overview

PAB3D solves the three-dimensional Reynolds-averaged Navier-Stokes equations with a finite-volume formulation on structured multi-block grids. The PAB3D code was developed at NASA Langley Research Center under NASA Contract NAS1-19831 and the United States Government retains certain  rights. The National Aeronautics and Space Administration, Langely Research Center (NASA LaRC), acting under the authority of the National Aeronautics and Space Act of 1958, as amended, and Analytical Services & Materials, Inc. (AS&M), jointly executed a Memorandum of Agreement (MOA) in order to foster commercialization of the PAB3D software code.

Initially developed to predict simple internal and external performance of nozzle-afterbody configurations, the code has evolved to predict complex flow in mixer-ejector nozzles, thrust vectoring, multi-species jet mixing, and propulsion installation with a variety of aerodynamic configurations. The PAB3D code is part of the CFD Resources at NASA Langley. The flow solver has a robust (production quality) two-equation k-epsilon turbulence models with anisotropic algebraic Reynolds stress models. Large Eddy Simulation LES and Partially Averaged Navier-Stokes Equation has been recently added to the code.PAB3D also has the capability of modeling standard air real-gas effects. The code is capable of working in multiprocessors and distributed computer systems (CFD on Inexpensive Clustered Computers). This code has been used to simulate complex aerodynamic flow configurations and is currently being used in several national programs such as:

      High Speed Research (HSR)

      Advanced Subsonic Technology (AST)

      Large Engine Technology (LET)

      CFD-Based Aero-Acoustic Prediction Method

      CFD-Based Model Mixer Design and Analysis


The CFD System

Key Features for PAB3D

     Dynamic Memory Allocation, MPI and GUI Capabilities using UPMS

     Conservative Patcher (PRE) for MultiBlock

     Different platform capability:

o       UNIX Cray, DEC, HP, IBM, SGI and SUN

o       Linux Intel and DEC

o       MS Windows XP,Intel

o       Apple MacOS

     3-D RANS/SMS Upwind Code

     Multiblock, General Patching with Mesh Sequencing

     Multiple flow solver and boundary conditions selectable by user at run time

     Modular multi-block structure with directionally selectable grid sequencing

     In-code calculations of integrated forces, moments, and flux quantities

     Mixed Roe and van Leer Solver Schemes

     Multi-Species and Real Gas Simulation

     Linear Two-Equation k-epsilon Models (Simplified/Full)

     Several Algebraic Reynold's Stress Models

     Large Eddy Simulation

     Partially Averaged Navier Stokes

     Compact memory requirements: (23+Nsp) Words per Grid Point

     Advanced Post Utility

     Runtime of 24 micro seconds per Iteration per Grid Point on Cray C-90

Grid Generation and PreProcessing

     AXB: Batch-mode Multiblock Grid Generation Package for simple topology

o       Circular or Rectangular Nozzles

     ICEM-CFD and Gridgen: Commercially available general purpose grid generator

o       Flow-Through Nacelles

o       Wing-Body Configurations

o       Complex geometry for propulsion-airframe integration

     Pre: Patcher and Memory Setup

o       Accepts many grid formats

o       Conservative patching between block interfaces for complex geometric configurations

Post Processing

     POST: Post Processor PAB3D Solution

o        Reads PLOT3D or PAB3D grid and solution files

o        Writes PLOT3D, binary Tecplot files

o        Computes most scalar functions from FAST, PLOT3D

o        Computes specialized quantities such as y+

o        Computes forces and moments

o        Computes thrust and other nozzle performance quantities

o        Interactive as well as script driven

     In-Code Performance Package

o        Computes aero-propulsion performance based on CFD solution

o        Available within PAB3D as a code module to monitor convergence

o        Output file formats compatible with standard graphics packages


Technology Applications

Fluidic Thrust Vectoring

     Computational Investigation of the Aerodynamic Effects on Fluidic Thrust Vectoring.

Jet Plume

     Numerical Simulation of Jet Aerodynamics- Format(s): Postscript, or PDF

     Jet Noise

Nozzle Internal Performance

     Nozzle Internal Performance Prediction Method Format(s): Postscript, or PDF

     High accuracy solutions for calibration nozzles

     2D-CD nozzle performance with and without vectoring

     3D Transition Duct

     Single Expansion Ramp Nozzle/Hypersonic SERN Performance

     3D Mixer-Ejector Simulations

     Fluidic Nozzle: September 1998 Technical Highlight

     Computational Investigation of the Aerodynamic Effects on Fluidic Thrust Vectoring

     Paylon-Chevron Core Nozzle Interaction

External Aerodynamics

     Transonic Circular-Arc Afterbody

     2-D and 3-D Conventional and Supercritical Wing

     Prediction of Very High Reynolds Number Compressible Skin Friction. Postscript, or PDF

     Twin-Engine Fighter Configuration

     F16XL Aerodynamic Simulation

     X34 Aerodynamic Simulation

     AGARD Working Group #17

     AGARD Test Cases

o       A.1 ONERA Axisymmetric Body without Jet at Incidence

o       A.2 ONERA Axisymmetric Body with Cold/Hot Flow

o       A.3 ONERA Twin Jet Cold Flow

o       B.1 NASA LaRC Single Engine Afterbody without Tails Model in LaRC 16-Foot TT

o       B.2 NASA LaRC Single Engine Afterbody with Tails

o       B.3 NASA LaRC Twin-Engine Afterbody with Tails

     B.3 Model in 16-Foot TT at NASA Langley Research Center

     B.3 Body Pressure Coefficient

     B.3 Pressure Distribution (3D)

     B.3 Nozzle Surface Streamlines

o       B.4 NASA LaRC 2-D C-D Single Engine Isolated Nozzle

     Parallel Computing Implementation in PAB3D

     Span-Wise Blowing

High NPR Axisymmetric Supercruise

     Alternate Controls Missile with ReactionJets

     High Reynolds Number Transonic Afterbody

Non-Aerospace Applications

     Paint Spray Nozzle Technology

     Diamond Power


PAB3D Consultants

   Dr. Abdol-Hamid PAB3D Code Developer (LaRC)
   Dr. Alaa Elmiligui Developer (AS&M)
    Dr. Steven J. Massey GUI, POST Developer (Eagle Aeronautics)
    Dr. S. Paul Pao AXB/PCH (LaRC)
    Ms. Karen A. Deere Applications (LaRC)


PAB3D Documentation

 Validation Archive

 Publications