Verification of the NSFLEX process with different test cases
Abstract
The NavierStokes solver using characteristic Flux Extrapolation (NSFLEX) process, an implicit Navier Stokes solver, was checked for the special case of flat plates. The comparisons with reference solutions were in good agreement with the compressible BLASIUS solution, and gave comparable values with the turbulence measurements, as long as the systems were in an adequately vertical position to the surface. The following examinations showed that the constancy of the total enthalpy was secured, that the modified crossed derivatives brought no improvement, that the viscosity derivatives with a three and four order discretization accuracy gave worse results for the chosen test examples, that the original two order derivative, so that the changes carried out for the turbulence model made the program unstable, without bringing noticeable increase in accuracy.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 January 1990
 Bibcode:
 1990STIN...9112056S
 Keywords:

 Finite Volume Method;
 Flat Plates;
 NavierStokes Equation;
 Turbulence Models;
 Turbulent Boundary Layer;
 Blasius Equation;
 Enthalpy;
 Extrapolation;
 Problem Solving;
 Fluid Mechanics and Heat Transfer