Development of Three-dimensional Grid-free Solver and its Applications to Multi-body Aerospace Vehicles

Abstract

Grid-free solver has the ability to solve complex multi-body industrial problems with minimal effort. Grid-free Euler solver has been applied to number of multi-body aerospace vehicles using Chimera clouds of points including flight vehicle with fin deflection, nose fairing separation of hypersonic launch vehicle. A preprocessor has been developed to generate connectivity for multi-bodies using overlapped grids. Surface transpiration boundary condition has been implemented to model aerodynamic damping and to impose the relative velocity of moving components. Dynamic derivatives are estimated with reasonable accuracy and less effort using the grid-free Euler solver with the transpiration boundary condition. Further, the grid-free Euler solver has been integrated with six-degrees of freedom (6-DOF) equations of motion to form store separation dynamics suite which has been applied to obtain the trajectory of a rail launch air-to-air-missile from a complex fighter aircraft.

Separation Dynamics of Air-to-Air Missile and Validation with Flight Data

“…It is shown that the simulation code can predict unsafe cases and can be used as an important analysis tool to determine critical flight conditions before carrying out actual flight tests. Recently, hybrid RANS/LES models are employed to predict the store separation from weapons bays 18. In the present work, an integrated store separation dynamics (SSD) tool 19 , that consists of a Grid-free Euler solver, a pre-processor and a RBD code, is used to simulate store separation dynamics of an agile air-to-air missile from a fighter aircraft at various launch conditions. The objective of the present work is to demonstrate that the SSD suite could predict the aircraft flow field effects on the trajectory of an unguided missile launched from the aircraft in flight.…”

A Meshless Solution Method for Unsteady Flow with Moving Boundary

“…By the 1990s [5], it began to be applied to computational fluid dynamics. Large numbers of researches are made by Liu and Su [6], Morinishi [7][8][9], Anandhanarayanan [10,11], and Katz and Jameson [12][13][14] later. The numerical simulation of unsteady flow with moving boundary in meshless method only involves the movement of the discrete points, but not restriction of stretch or distortion of mesh.…”

“…Compared with mesh methods, meshless method has more advantages of geometric flexibility in dealing with complex 2 Advances in Mechanical Engineering aerodynamic calculation for complex configuration and complex flow process. Numerical simulation of unsteady flow based on meshless method has been studied by Morinishi [15], Anandhanarayanan [10,11], Wang et al [16], Zhou and Xu [17,18], Wang et al [19,20], and Pu and Chen [21].…”

A meshless finite point method for three‐dimensional analysis of compressible flow problems involving moving boundaries and adaptivity

“…[11] for a comparative analysis of popular discretization approaches). Moreover, applications to unsteady problems accounting for body motion have also been explored with success in a meshless context through small perturbation boundary conditions or domain deformation techniques, see for instance [12][13][14]. All in all, meshless features have been increasingly exploited and numerous advantages over conventional discretization techniques have been brought to light.…”