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The PARC Code: Theory and Usage
Final rept. 1 Oct 1985-1 Jun 1987
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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The PARC code is a flow-field simulation computer program based on the strong conservation law form of the Navier Stokes equations. Several variants of these equations are treated, including 2-D, axisymmetric, and 3-D versions and inviscid, laminar, and turbulence specializations. Use is made of perfect has equations of state and Sutherlands viscosity law. The equations are expressed in curvilinear coordinates while retaining strong conservation law forms. The Beam and Warming approximate factorization algorithm is used for forming the implicit central-difference algorithm. Pulliams scalar pentadiagonal transformation is applied to produce an efficient steady-state solver. Artificial viscosity is added both implicity and explicitly and follows the switched fourth-order and second-order form of Jameson. The metrics are calculated in a finite volume manner so as to maintain free steam. Variable spatial and temporal time-steps are used for improved algorithm efficiency and robustness. Generalized boundary conditions are selected through code inputs and may be located anywhere within the computational grid. Use of the PARC code is straight-forward, requiring only a restart file and file of NAMELIST inputs. These inputs allow the selection of flow equation specialization, thermodynamic properties, grid size, artificial viscosity parameters, iteration controls, and output parameters are provided through NAMELIST input.
APPROVED FOR PUBLIC RELEASE