Global Artificial Boundary Conditions For Computation Of External Flow Problems With Propulsive Jets

Global Artificial Boundary Conditions for Computation of External Flow Problems with Propulsive Jets

We propose new global artificial boundary conditions (ABC's) for computation of flows with propulsive jets. The algorithm is based on application of the difference potentials method (DPM). Previously, similar boundary conditions have been implemented for calculation of external compressible viscous flows around finite bodies. The proposed modification substantially extends the applicability range of the DPM-based algorithm. In the paper, we present the general formulation of the problem, describe our numerical methodology, and discuss the corresponding computational results. The particular configuration that we analyze is a slender three-dimensional body with boat-tail geometry and supersonic jet exhaust in a subsonic external flow under zero angle of attack. Similarly to the results obtained earlier for the flows around airfoils and wings, current results for the jet flow case corroborate the superiority of the DPM-based ABC's over standard local methodologies from the standpoints of accuracy, overall numerical performance, and robustness. Tsynkov, Semyon and Abarbanel, Saul and Nordstrom, Jan and Ryabenkii, Viktor and Vatsa, Veer Goddard Space Flight Center; Langley Research Center NAS1-97046; RTOP 505-90-52-01...

Global Artificial Boundary Conditions for Computation of External Flow Problems with Propulsive Jets

Method of Difference Potentials and Its Applications

The first English edition of a well-known Russian monograph. This book presents the method of difference potentials first proposed by the author in 1969, and contains illustrative examples and new algorithms for solving applied problems of gas dynamics, diffraction, scattering theory, and active noise screening.