Mesh update and projection techniques for 3D aerodynamic simulations

Abstract

The target is to develop computational techniques for studying aerodynamic interactions between multiple objects with emphasis on studying the fluid mechanics and dynamics of an object exiting and separating from an aircraft. In these cases, the computational challenge is to predict the dynamic behaviour and path of the object, so that the separation process is safe and effective. This is a very complex problem because it has an unsteady, three-dimensional nature and requires the solution of complex equations that govern the fluid dynamics of the object and the aircraft together, with their relative positions changing in time. The gravitational and aerodynamic forces acting on the object determine its dynamics and path. The computational tools developed are based on the simultaneous solution of the time-dependent Navier–Stokes equations governing the airflow around the aircraft and the separating object, as well as the equations governing the motion of that object. These computational methods must include suitable mesh update techniques. In the research presented, focus is given to development of mesh update methods to increase the numerical accuracy and efficiency of the computations. These methods range from update tactics, reducing distortion and methods reducing the error introduced through projection.

Keywords:

• mesh movement
• store separation
• unsteady Navier–Stokes
• remeshing