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    A comparative study of nonreflecting far-field boundary condition procedures for unsteady transonic flow computation (1981)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: Various nonreflecting far-field boundary condition procedures are compared by implementing them in the computer code LTRAN2. This code solves the implicit finite-difference representation of the small-disturbance equations for transonic flows about airfoils. The first- and second-approximate nonreflecting conditions, as proposed by Engquist and Majda, are compared with the condition derived from the full-characteristic equation. The far-field boundary conditions and the description of the algorithm for implementing these conditions in LTRAN2 are discussed. Various cases are computed and compared with results from the older, more conventional procedures. One concludes that the full-characteristic equation produces the most effective results, thus allowing the far-field boundary to be located closer to the airfoil; this decreases the computer time required to obtain the solution because fewer mesh points are required.
    Keywords: NUMERICAL ANALYSIS
    Type: Numerical Boundary Condition Procedures; p 21-44
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    INS3D: An incompressible Navier-Stokes code in generalized three-dimensional coordinates (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The operation of the INS3D code, which computes steady-state solutions to the incompressible Navier-Stokes equations, is described. The flow solver utilizes a pseudocompressibility approach combined with an approximate factorization scheme. This manual describes key operating features to orient new users. This includes the organization of the code, description of the input parameters, description of each subroutine, and sample problems. Details for more extended operations, including possible code modifications, are given in the appendix.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-TM-100012 , A-87293 , NAS 1.15:100012
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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