Effects of the Jacobian evaluation on Newton's solution of the Euler equations

Onur O., EYİ S.

17th AIAA Computational Fluid Dynamics Conference, Toronto, Canada, 6 - 09 June 2005 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • City: Toronto
  • Country: Canada
  • Middle East Technical University Affiliated: Yes


A Newton's method is developed for solving the 2-D Euler equations. The Euler equations are discretized using a finite-volume method with upwind flux splitting schemes. Both analytical and numerical methods are used for Jacobian calculations. Although the numerical method has the advantage of keeping the Jacobian consistent with the numerical residual vector and avoiding extremely complex analytical differentiations, it may have accuracy problems and need longer execution time. In order to improve the accuracy of numerical Jacobians, detailed error analyses are performed. Results show that the finite-difference perturbation magnitude and computer precision are the most important parameters that affect the accuracy of numerical Jacobians. A method is developed for calculating an optimal perturbation magnitude that can minimize the error in numerical Jacobians. The accuracy of the numerical Jacobians is improved significantly by using the optimal perturbation magnitude. The effects of the accuracy of numerical Jacobians on the convergence of the flow solver are also investigated. In order to reduce the execution time for numerical Jacobian evaluation, flux vectors with perturbed flow variables are calculated only for neighbouring cells. A sparse matrix solver that is based on LU factorization is used. Effects of different flux splitting methods and higher-order discretizations on the performance of the solver are analyzed. © 2005 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.