Recent Progress in OVERFLOW Convergence Improvements
Joseph M. Derlaga, Charles W. Jackson, Pieter G. Buning
Abstract
Improvements have been made to the implicit symmetric successive overrelaxation algorithm in the OVERFLOW 2.3 structured, overset grid, computational fluid dynamics flow solver. These improvements, consisting of implicit boundary conditions, improved flux Jacobian linearizations, and CFL number ramping, are a series of evolutionary changes to the linear solver that have resulted in increased nonlinear convergence rates and faster time to solution. A series of test cases are presented that demonstrate the effect of the changes through comparison with the original SSOR path and other linear solver implementations within OVERFLOW.
Topics & Concepts
SolverJacobian matrix and determinantConvergence (economics)Applied mathematicsSeries (stratigraphy)Computer scienceNonlinear systemMathematicsAlgorithmMathematical optimizationPaleontologyEconomicsBiologyEconomic growthPhysicsQuantum mechanicsComputational Fluid Dynamics and AerodynamicsFluid Dynamics and Turbulent FlowsGas Dynamics and Kinetic Theory