Publication Date:
2019-07-13
Description:
Several improvements to the mixed-elementUSM3Ddiscretization and defect-correction schemes have been made. A new methodology for nonlinear iterations, called the Hierarchical Adaptive Nonlinear Iteration Method, has been developed and implemented. The Hierarchical Adaptive Nonlinear Iteration Method provides two additional hierarchies around a simple and approximate preconditioner of USM3D. The hierarchies are a matrix-free linear solver for the exact linearization of Reynolds-averaged Navier-Stokes equations and a nonlinear control of the solution update. Two variants of the Hierarchical Adaptive Nonlinear Iteration Method are assessed on four benchmark cases, namely, a zero-pressure-gradient flat plate, a bump-in-channel configuration, the NACA 0012 airfoil, and a NASA Common Research Model configuration. The new methodology provides a convergence acceleration factor of 1.4 to 13 over the preconditioner-alone method representing the baseline solver technology.
Keywords:
Fluid Mechanics and Thermodynamics; Numerical Analysis
Type:
AIAA Paper 2015-1747
,
NF1676L-23409
,
AIAA Journal (ISSN 0001-1452) (e-ISSN 1533-385X); 54; 9; 2589-2610|AIAA Aerospace Sciences Meeting; Jan 05, 2015 - Jan 09, 2015; Kissimmee, FL; United States
Format:
text
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