بررسي اثر زاويه‌ي نصب ملخ و اثرات سه‌بعدي ملخ روي دم يك قايق پرنده در نزديكي سطح‌

g ".0 « All of the results are in good concordance with experimental data. and the present method can be extended for the full nonlinear motion of ships in waves. STUDY OF PROPELLER }NSTALLMENT ANGLE AND ITS 3-D !AERODYNAMIC INTERFERENCES WITH A F

The solut ion of th ree-dimensional Navier-Stokes equations is obtained and used to study the aerodynamic int erference between a propeller and an empunage. Results show that thi s int erference is quite important, especially when the comp onents are in ground effect . The propeller should be positioned in such a way to redu ce the negative asp ect of the interactions while, at the same time, keeping the lift and dr ag within an acceptable range. Using computed flow fields, the proper direction of th e propeller, regarding the above criterion, is determined . In this study, th e flow field around a propellerempunage combination in ground effect, using 3.1 million cells on a cluster of workstations , is obtained and present ed