Recent developments on the automation of the X-rays approach to hole-cutting in overset grids is further improved. A fast method to compute an auxiliary wall-distance function used in providing a first estimate of the hole boundary location is introduced. Subsequent iterations lead to automatically-created hole boundaries with a spatially-variable offset from the minimum hole. For each hole bou...

The time domain solution of the equations of motion of structures subjected to a stochastic wind field is often obtained by a step-by-step integration approach. The loading is described by simulated time histories of the aerodynamic force. Recently, autoregressive and moving average (ARMA) recursive models have been utilized to simulate the time series of wind loads. Based on the system dynamic...

The dynamic response analysis of structures subjected to a stochastic wind field is carried out in the time domain by a step-by-step integration approach. The loading is represented by simulated time histories of the aerodynamic force. The auto-regressive and moving average (ARMA) recursive models are utilized to simulate time series of wind loads. Depending on the system dynamic characteristic...

The dynamics of cables with concentrated loads is studied using a direct perturbation method (DPM) combined with multiple time scales. A general cable model is assumed to have complex loads, including nonlinear aerodynamic force and concentrated masses. An early developed perturbation method––DPM–– is applied to investigate the cable s motion. This approach does not need to transform the origin...

The ability of vortices to induce aerodynamic loads on proximal surfaces plays a significant role in wide variety flows. However, most studies vortex-induced effects primarily focus analyzing the influence rotation-dominated cores vortices. In this work, we show that not only are viscous flows surrounded by strain-dominated regions, but these regions dynamically important and can sometimes even...

Abstract Frequency-domain unsteady lifting-line theory (ULLT) provides a means by which the aerodynamics of oscillating wings may be studied at low computational cost without neglecting interacting effects aspect ratio and oscillation frequency. Renewed interest in method has drawn attention to several uncertainties however. Firstly, what extent is ULLT practically useful for rectangular wings,...

D U R I N G T H E P R O C E S S of design, the possible future loads and conditions to which a structure may be subjected must be conceived of and properly accounted for in analysis. It is hoped that, after the structure is erected, the loads and conditions which nature and man eventually impose on it will fall within the "envelope" of those previously conceived. When they do, the design is suc...