In recent years, structured overset grid technology has been successfully applied to computational fluid dynamics analysis on a wide variety of complex aerospace applications.1–11 While structured overset grid flow solvers such as OVERFLOW12 and LAVA13 are highly e cient relative to typical flow solvers utilizing unstructured grids, structured overset grid generation remains a labor intensive a...

The influence of a propeller on the aerodynamic performance of an MAV is investigated using an unstructured overset grid technique. The flow regime of a fixed-wing MAV powered by a propeller contains both incompressible regions due to the low flight speed, as well as compressible flow areas near the propeller-tip region. In order to simulate all speed flow efficiently, a dual-time preconditioni...

In the present talk, the strategies to apply the sensitivity analysis method to aerodynamic shape optimization problems of complex geometries are intensively discussed. To resolve the design of complicated aircraft geometries such as high-lift devices, wing/body configurations, overset mesh techniques are adopted. In addition, a noticeable sensitivity analysis method, adjoint approach, which sh...

Achieving higher accuracy and fidelity in aerodynamic simulations using higher-order methods has received significant attention over the last decade. High-order methods are attractive because they provide higher accuracy with fewer degrees of freedom and at the same time relieve the burden of generating very fine meshes. Discontinuous Galerkin (DG) methods1 have received particular attention fo...

in this paper, the interactions of flow over two circular or rectangular cylinders, passing by each other, have been investigated, using overset grids method. two-dimensional incompressible governing fluid flow equations are solved using finite volume method. in this research, several interpolation methods have been tested to transfer data between grids. one of them called mass flux base interp...

This paper summarizes a method that solves both the three dimensional thin-layer Navier-Stokes equations and the Euler equations using overset structured and solution adaptive unstructured grids with applications to helicopter rotor fiowfields. The overset structured grids use an implicit finite-difference method to solve the thin-layer Navier-Stokes/Euler equations while the unstructured grid ...

The overset, or chimera, grid methodology utilizes a set of overlapping grids to discretize the solution domain. The critical first step in the overset process is the hole cutting with many different approaches currently in use. The present paper investigates an approach that seeks to maximize automation and minimize user inputs. The method uses the surfaces of the grids that define geometry fo...

in this paper an efficient dual time implicit approach is used to solve viscous laminar flow around two bodies with general motion. therefore, the grid includes a background grid and two sets of grids around the moving bodies. rotational and translational motions of two bodies are managed separately in this grid arrangement. in this work the overset concept for hybrid grid is used and flow vari...