Analytical Services & Materials, Inc.

A 3-D Navier-Stokes CFD System | Email: This email address is being protected from spambots. You need JavaScript enabled to view it.


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, Langley 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:
    • UNIX Cray, DEC, HP, IBM, SGI and SUN
    • Linux Intel and DEC
    • MS Windows (Intel)
    • 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
    • Circular or Rectangular Nozzles
  • ICEM-CFD and Gridgen: Commercially available general purpose grid generator
    • Flow-Through Nacelles
    • Wing-Body Configurations
    • Complex geometry for propulsion-airframe integration
  • Pre: Patcher and Memory Setup
    • Accepts many grid formats
    • Conservative patching between block interfaces for complex geometric configurations

Post Processing

  • POST: Post Processor PAB3D Solution
    • Reads PLOT3D or PAB3D grid and solution files
    • Writes PLOT3D, binary Tecplot files
    • Computes most scalar functions from FAST, PLOT3D
    • Computes specialized quantities such as y+
    • Computes forces and moments
    • Computes thrust and other nozzle performance quantities
    • Interactive as well as script driven
  • In-Code Performance Package
    • Computes aero-propulsion performance based on CFD solution
    • Available within PAB3D as a code module to monitor convergence
  • 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
  • Jet Noise

Nozzle Internal Performance

  • Nozzle Internal Performance Prediction Method Format(s)
  • 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-Core Nozzle Interaction

External Aerodynamics

High NPR Axisymmetric Supercruise

  • Alternate Controls Missile with Reaction Jets
  • High Reynolds Number Transonic Afterbody

Non-Aerospace Applications

  • Paint Spray Nozzle Technology
  • Diamond Power

PAB3D Documentation | Publications