Further exploring CFD-based gust response and gust alleviation

The introduction of the full paper, after reviewing a number of papers in the open literature that explore CFD(computational fluid dynamics)-based gust response, finds that Ref. 3 is quite helpful for our further exploration. Sections 1 and 2 present the results of our further exploration. The core of section 1 is that we use the unsteady Euler equations and the grid velocity method to investigate the dynamic response of the airfoil in vertical gust flow perturbation and to investigate the gust influence. Section 2 studies the rudder movement of gust unloading effect. Its core consists of: (1) we apply the grid velocity method to simulating the gust response of the typical NACA0006 airfoil to the step changes in the angle of attack of aircraft; (2) we analyze the gust response of the one-minus-cosine gust profile and gust-caused step changes in the angle of attack of the NLR airfoil; we use the moving flap to study the dynamic gust load alleviation and the flap motion parameters to show the gust alleviation effects on the aerodynamic performance; (3) the simulation results are given in Figs. 3 and 4, Figs. 6 through 11 and Table 1. The simulation results and their analysis show preliminarily that: (1) the lift response of the airfoil agrees well with both the exact theoretical values and the calculated values in Ref. 3; (2) the rudder movement designed by using our method can effectively alleviate the freestream gust fluctuation and ensure good flight performance. Our exploration work has not yet fully considered the actual gust conditions and further exploration is necessary.