OVERFLOW 2 swMATH ID: 18196 Software Authors: Robert H. Nichols; Pieter G. Buning Description: A Nonlinear Harmonic Balance Solver for an Implicit CFD Code: OVERFLOW 2. A National Aeronautics and Space Administration computational fluid dynamics code, OVERFLOW 2, was modified to utilize a harmonic balance solution method. This modification allows for the direct calculation of the nonlinear frequency-domain solution of a periodic, unsteady flow while avoiding the time consuming calculation of long physical transients that arise in aeroelastic applications. With the usual implementation of this harmonic balance method, converting an implicit flow solver from a time marching solution method to a harmonic balance solution method results in an unstable numerical scheme. However, a relatively simple and computationally inexpensive stabilization technique has been developed and is utilized. With this stabilization technique, it is possible to convert an existing implicit time-domain solver to a nonlinear frequency-domain method with minimal modifications to the existing code. This new frequency-domain version of OVERFLOW 2 utilizes the many features of the original code, such as various discretization methods and several turbulence models. The use of Chimera overset grids in OVERFLOW 2 requires care when implemented in the frequency-domain. This research presents a harmonic balance version of OVERFLOW 2 that is capable of solving on overset grids for sufficiently small unsteady amplitudes. Homepage: https://overflow.larc.nasa.gov/home/users-manual-for-overflow-2-2/ Related Software: OVERFLOW; elsA; Overture; Spalart-Allmaras; AUSMPW+; SUGGAR++; StarCCM+; Nek5000; FDL3DI; XFOIL; PEGASUS 5; RIEMANN; HE-E1GODF; HLLE; AUSM; CMPGRD; PALM; O-PALM; AVBP; Chapel Cited in: 12 Publications all top 5 Cited by 40 Authors 1 Atinault, Olivier 1 Barad, Michael F. 1 Benek, John A. 1 Benoit, Christophe 1 Brehm, Christoph 1 Cai, Jinsheng 1 Chang, Chau-Lyan 1 Chang, Sinchung 1 Cheng, Gary C. 1 Da Ronch, Andrea 1 Duchaine, Florent 1 Duran, Ignacio 1 Dutta, Som 1 Fischer, Paul F. 1 Galbraith, Marshall C. 1 Gicquel, Laurent Yves Marcel 1 Gournay, Elie 1 Housman, Jeffrey A. 1 Hue, David 1 Jin, Yao 1 Kiris, Cetin C. 1 Kitamura, Keiichi 1 Liao, Fei 1 Liggett, N. D. 1 Mayeur, Julien 1 Mccracken, A. K. 1 Mittal, Ketan 1 Moreau, Stéphane 1 Mosahebi, Ali 1 Nadarajah, Siva K. 1 Nonomura, Taku 1 Orkwis, Paul D. 1 Papadogiannis, Dimitrios 1 Péron, Stéphanie 1 Raud, Pascal 1 Rumpfkeil, Markus P. 1 Turner, Mark G. 1 Venkatachari, Balaji Shankar 1 Wang, Gaofeng 1 Wiart, Ludovic Cited in 3 Serials 8 Computers and Fluids 3 Journal of Computational Physics 1 International Journal of Computational Fluid Dynamics Cited in 2 Fields 12 Fluid mechanics (76-XX) 7 Numerical analysis (65-XX) Citations by Year