Far-Field Induced Drag Prediction Using Vorticity Confinement Technique

2014 ◽  
Vol 51 (6) ◽  
pp. 1953-1958 ◽  
Author(s):  
Troy Snyder ◽  
Alex Povitsky
Keyword(s):  
Far Field ◽  
Induced Drag ◽  
Vorticity Confinement ◽  
Drag Prediction

scholarly journals Computational Drag Prediction of the DPW4 Configuration Using the Far-Field Approach

2011 ◽  
Vol 48 (5) ◽  
pp. 1658-1670 ◽  
Author(s):  
David Hue ◽  
Sebastien Esquieu
Keyword(s):  
Far Field ◽  
Field Approach ◽  
Drag Prediction

Accurate decomposition method and identification technology of drag

2020 ◽  
Vol 34 (14n16) ◽  
pp. 2040114
Author(s):  
Jia-Lei Yu ◽  
Jing Jin ◽  
Chun Shao ◽  
Miao Zhang ◽  
Tie-Jun Liu
Keyword(s):  
Shock Wave ◽  
Integral Method ◽  
Physical Mechanism ◽  
Wave Drag ◽  
Irreversible Processes ◽  
Viscous Drag ◽  
Numerical Dissipation ◽  
Far Field ◽  
Induced Drag ◽  
Field Integral

Aiming at accurate decomposition and identification of drag, the drag prediction technology based on the mid/far-field integral method is developed. The method decomposes the far-field drag into entropy drag and induced drag according to its physical mechanism, and introduces an appropriate entropy correction to eliminate the numerical dissipation by analyzing the influence of the trailing integral section position on the entropy drag calculation. Based on the analysis of thermodynamic reversible processes and irreversible processes, the drag is refined into viscous drag, shock wave drag, induced drag and pseudo-drag. The mid-field integral method is used to calculate the separate contribution of viscous drag, shock wave drag and induced drag by calculating the limited integral domain. Numerical results show that the developed method is feasible in accurately reflecting the physical mechanism and predicting the drag ratio. Thus, it provides a reliable tool for drag reduction of large passenger aircraft.

Far-Field Drag-Prediction Technique Applied to Wing Design for Civil Aircraft

2003 ◽  
Vol 40 (3) ◽  
pp. 425-431 ◽  
Author(s):  
Jie Li ◽  
Fengwei Li ◽  
Qin E.
Keyword(s):  
Far Field ◽  
Wing Design ◽  
Civil Aircraft ◽  
Prediction Technique ◽  
Drag Prediction

Far-Field Drag Prediction and Decomposition Method for Unsteady Flows

2011 ◽  
Author(s):  
Martin Gariepy ◽  
Jean-yves Trepanier ◽  
Benoit Malonin ◽  
Christian Masson
Keyword(s):  
Decomposition Method ◽  
Unsteady Flows ◽  
Far Field ◽  
Drag Prediction

Convergence Criterion for a Far-Field Drag Prediction and Decomposition Method

AIAA Journal ◽  
2011 ◽  
Vol 49 (12) ◽  
pp. 2814-2818 ◽  
Author(s):  
Martin Gariépy ◽  
Jean-Yves Trépanier ◽  
Christian Masson
Keyword(s):  
Decomposition Method ◽  
Convergence Criterion ◽  
Far Field ◽  
Drag Prediction

scholarly journals Wake-model effects on induced drag prediction of staggered boxwings

2021 ◽  
Author(s):  
Julian Schirra ◽  
William Bissonnette ◽  
Götz Bramesfeld
Keyword(s):  
Potential Flow ◽  
Euler Method ◽  
Higher Order ◽  
Flow Method ◽  
Induced Drag ◽  
Wake Effects ◽  
Drag Prediction ◽  
Wake Model ◽  
Lifting Surfaces ◽  
High Degree

For staggered boxwings the predictions of induced drag that rely on common potential-flow methods can be of limited accuracy. For example, linear, freestream-fixed wake models cannot resolve effects related to wake deflection and roll-up, which can have significant affects on the induced drag projection of these systems. The present work investigates the principle impact of wake modelling on the accuracy of induced drag prediction of boxwings with stagger. The study compares induced drag predictions of a higher-order potential-flow method that uses fixed and relaxed-wake models, and of an Euler-flow method. Positive-staggered systems at positive angles of attack are found to be particularly prone to higher-order wake effects due to vertical contraction of wakes trajectories, which results in smaller effective height-to-span ratios than compared with negative stagger and thus closer interactions between trailing wakes and lifting surfaces. Therefore, when trying to predict induced drag of positive staggered boxwings, only a potential-flow method with a fully relaxed-wake model will provide the high-degree of accuracy that rivals that of an Euler method while being computationally significantly more efficient. Keywords: wake-model; boxwing; induced drag; potential-flow theory

Drag Prediction Workshop 4 Results Using Different Grids Including Near-Field/Far-Field Drag Analysis

2013 ◽  
Vol 50 (5) ◽  
pp. 1615-1627 ◽  
Author(s):  
Jan B. Vos ◽  
Stephane Sanchi ◽  
Alain Gehri
Keyword(s):  
Near Field ◽  
Far Field ◽  
Drag Prediction ◽  
Drag Analysis
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