Improvements to SUGGAR and DiRTlib for Overset Store Separation Simulations

Abstract

SUGGAR is a general overset grid assembly capability that is targeted at moving body simulations. DiRTlib is a library that encapsulates the functionality required to perform the overset interpolation and communications required in an overset composite grid solution. This paper describes enhancements that have been made to SUGGAR and DiRTlib to improve the performance and capability for moving body problems. A procedure to adapt the grids to overlap requirements is demonstrated and found effective in reducing or eliminating the orphans due to insufficient overlap. In addition, SUGGAR can also be linked into the flow solver as a library to provide a capability integral to the flow solver. The paper documents the library interface and discusses modifications required to the flow solver to utilize SUGGAR as a library. Finally, a new overset domain connectivity code, Suggar++, is being developed, and this paper briefly discusses the improvements it offers relative to SUGGAR.

Store Release Trajectory Variability from Weapon Bays Using Scale-Adaptive Simulations

“…Several studies have utilised this test case, using structured [22,23,24,25], unstructured [26,27,28,29,30,31] and meshless solvers [32], to validate the prediction of the store trajectory, making it a popular validation case. The test provided pressure data for a geometrically simple wing and store under mutual interference as well as a realistic trajectory.…”

Three-Dimensional Dynamic Overset Method for Stabilized Finite Elements

“…However, as mentioned above, due to the shortcomings of mesh movement algorithms, overset grid methods were extended for use within unstructured-grid simulation techniques. [6][7][8] The overset grid assembly software SUGGAR 9 and PEGASUS 10 have been utilized for numerous finite-volume solutions to complex, moving boundary aeronautical and hydrodynamic simulations. However, difficulties have been found in processing these overlapped grids for viscous computations where high stretching occurs as well as with orphan points (i.e., points where a proper interpolation stencil cannot be established) in particularly critical regions of the flow.…”

Structure overset grid method and its applications to simulation of multi-body separation

“…Therefore, it has been widely used in the simulation of multi-body separation. PEGASUS [16,17], SUGGAR [18][19][20] and OVERGRID [21] are three of the most popular overset grid software.…”