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What is ISAAC?

ISAAC (Integrated Solution Algorithm for Arbitrary Configurations) is a compressible Euler/Navier-Stokes computational fluid dynamics code. ISAAC includes the capability of calculating the Euler equations for inviscid flow or the Navier-Stokes equations for viscous flows. ISAAC uses a domain decomposition structure to accomodate complex physical configurations. ISAAC can calculate either steady-state or time dependent flow.

ISAAC was designed to test turbulence models. Various two equation turbulence models, explicit algebraic Reynolds stress models, and full differential Reynolds stress models are implemented in ISAAC. Several test cases are documented in the User's Guide.


ISAAC was developed under contract to the NASA Langley Research Center while the author was employed by Analytical Services and Materials, Inc. ISAAC is made available WITH NO WARRANTY under the terms of the ISAAC Public Source License.

Publications using ISAAC

The following is a list of several publications using the ISAAC code.

  1. Morrison, J. H., Flux Difference Split Scheme for Turbulent Transport Equations, AIAA Paper 90-5251, October 1990.
  2. Morrison, J. H., A Compressible Navier-Stokes Solver with Two-Equation and Reynolds Stress Turbulence Closure Models, NASA CR-4440, May 1992.
  3. Morrison, J. H. and Korte, J. J., Implementation of Vigneron's Streamwise Pressure Gradient Approximation in Parabolized Navier-Stokes Equations, AIAA Journal, Vol. 30, No. 12, November 1992.
  4. Morrison, J. H., Gatski, T. B., Sommer, T. P., Zhang, H. S., and So, R. M. C., Evaluation of a Near-Wall Turbulent Closure Model in Predicting Compressible Ramp Flows, Near-Wall Turbulent Flows, Eds. R. M. C. So, C. G. Speziale, and B. E. Launder, Elsevier Science Publishers B.V., 1993.
  5. Chenault, C. F., Development and Implementation of a Scramjet Cycle Analysis Code With a Finite-Rate-Chemistry Combustion Model For Use on A Personal Computer, Masters Thesis, Air Force Institute of Technology, December 1993. AFIT/GAE/ENY/93D-7
  6. Abid, R., Gatski, T. B., and Morrison, J. H., Assessment of Pressure-Strain Models in Predicting Compressible, Turbulent Ramp Flows, AIAA Journal, Vol. 33, No. 1, January 1995.
  7. Vahala, G., Vahala, L., Morrison, J., Krasheninnikov, S., and Sigmar, D., Effects of Neutral Three-Dimensional Turbulence in the Gas Blanket Regime for Divertors, Physics Letters A, Vol. 205, 1995, pp. 266-273.
  8. Vahala, G., Vahala, L., Morrison, J., Krasheninnikov, S., and Sigmar, D., Toroidal Wall Heat Flux and Conductivity Profiles Due to Neutral 3D Turbulence in the Gas Blanket Regime for Divertors, Contrib. Plasma Phys., Vol. 36, No. 2/3, 1996, pp. 304-308.
  9. Gatski, T. B., Prediction of Airfoil Characteristics with Higher Order Turbulence Models, NASA Technical Memorandum 110246, April, 1996. Abstract | PDF | Postscript
  10. Gatski, T. B., Airfoil Stall Prediction Using a Two-Equation and an Explicit Algebraic Stress Model, Advances in Turbulence VI, Eds. Gavrilakis, S., Machiels, L., and Monkewitz, P. A., Kluwer Academic Publishers, 1996.
  11. Ristorcelli, J. R. and Morrison, J. H., The Favre-Reynolds Average Distinction and a Consistent Gradient Transport Expression for the Dissipation, Physics of Fluids, Vol. 8, No. 9, September 1996.
  12. Abid, R., Morrison, J. H., Gatski, T. B., and Speziale, C. G., Prediction of Aerodynamic Flows with a New Explicit Algebraic Stress Model, AIAA Journal, Vol. 34, No. 12, December 1996.
  13. Vahala, G., Vahala, L., Morrison, J., Krasheninnikov, S., and Sigmar, D., K-e Compressible 3D Neutral Fluid Turbulence Modelling of the Effect of Toroidal Cavities on Flame-Front Propagation in the Gas-Blanket Regime for Tokamak Divertors, J. Plasma Physics, Vol. 57, Part 1, 1997, pp. 155-173.
  14. Woodruff, S. L., Morrison, J. H., and Hussaini, M. Y., Evaluation of Several Turbulence Models in a Multiple-Element Airfoil Computation, AIAA Paper 98-0327, January 1998.
  15. Chenault, C. F., Analysis of Turbulence Models as Applied to Two- and Three-Dimensional Injection Flows, Ph.D. Dissertation, Air Force Institute of Technology, March 1998. AFIT/DS/ENY/98M-01
  16. Chenault, C. F., Beran, P. S., and Bowersox, R. D. W., Second-Order Reynolds Stress Turbulence Modeling of Three-Dimensional Oblique Supersonic Injection, AIAA Paper 98-3425, July 1998.
  17. Chenault, C. F. and Beran, P. S., K-Epsilon and Reynolds Stress Turbulence Model Comparisons for Two-Dimensional Injection Flows, AIAA Journal, Vol. 36, No. 8, pp. 1401-1412, August 1998.
  18. Morrison, J. H., Numerical Study of Turbulence Model Predictions for the MD 30P/30N and the NHLP-2D Three-Element Highlift Configurations, NASA CR-1998-208967, December 1998. Abstract | PDF | Postscript
  19. Chenault, C. F., Beran, P. S., and Bowersox, R. D. W., Numerical Investigation of Supersonic Injection Using a Reynolds-Stress Turbulence Model, AIAA Journal, Vol. 37, No. 10, October 1999.
  20. Woodruff, S. L., Seiner, J. M., Hussaini, M. Y., and Erlebacher, G., Evaluation of Turbulence-Model Performance in Jet Flows, AIAA Journal, Vol. 39, No. 12, December 2001.
  21. Morrison, J. H., Panaras, A. G., Gatski, T. B., and Georgantopoulos, G. A., Analysis of Extensive Cross-Flow Separation using Higher-Order RANS Closure Models, AIAA Paper 2003-3532, June 2003. Abstract | PDF | Postscript
  22. Poroseva, S. V., Hussaini, M. Y., and Woodruff, S. L., On Improving the Predictive Capability of Turbulence Models Using Evidence Theory, AIAA Paper 2005-1096, January 2005. Logo

Copyright ©2001-2005 Joseph H. Morrison