Some remarks on CFD drag prediction of an aircraft model
Observed in CFD drag predictions for the DLR-F6 aircraft model with various configura- tions, some issues are addressed. The emphasis is placed on the effect of turbulence modeling and grid resolution. With several different turbulence models, the predicted ow feature around the aircraft is highlighted. It is shown that the prediction of the separation bubble in the wing-body junction is closely related to the inherent modeling mechanism of turbulence production. For the configura- tion with an additional fairing, which has effectively removed the separation bubble, it is illustrated that the drag prediction may be altered even for attached turbulent boundary layer when different turbulence models are used. Grid sensitivity studies are performed with two groups of subsequently refined grids. It is observed that, in contrast to the lift, the drag prediction is rather sensitive to the grid refinement, as well as to the artificial diffusion added for solving the turbulence transport equa- tion. It is demonstrated that an effective grid refinement should drive the predicted drag components monotonically and linearly converged to a finite value.
CFD drag prediction DLR-F6 aircraft model turbulence modeling grid sensitivity
S.H.Peng P.Eliasson
Department of Computational Physics,Swedish Defence Agency, FOI, SE-164 90 Stockholm, Sweden
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）