Accession Number:

ADA180145

Title:

Composite Grid and Finite-Volume LU (Lower-Upper) Implicit Scheme for Turbine Flow Analysis.

Descriptive Note:

Technical memo.,

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER

Report Date:

1987-06-01

Pagination or Media Count:

12.0

Abstract:

A composite grid was generated in an attempt to improve grid quality for a typical turbine blade with large camber in terms of mesh control, smoothness, and orthogonality. This grid consists of the C-grid in the immediate vicinity of the blade and the H-grid in the upstream region and in the middle of the blade passage between the C-grids. It provides good boundary layer resolution around the leading-edge region for viscous calculation, has orthogonality at the blade surface and slope continuity at the C-H interface, and has flexibility in controlling mesh distribution in the upstream region without using excessive grid points. This composite grid eliminates the undesirable qualities of a single grid when generated for a typical turbine geometry. A finite-volume lower-upper LU implicit scheme can be used in solving for the turbine flows on the composite grid. This scheme was demonstrated to be robust and efficient for both external and internal flows in a broad flow regime.

Subject Categories:

  • Fluid Mechanics
  • Numerical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE