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Paper Information

Journal:   MODARES MECHANICAL ENGINEERING   OCTOBER 2017 , Volume 17 , Number 7 ; Page(s) 161 To 170.
 
Paper: 

CONTINUOUS ADJOINT SHAPE OPTIMIZATION FOR LOW REYNOLDS NUMBER OSCILLATING AIRFOILS IN VISCOUS FLOW ON UNSTRUCTURED GRIDS

 
 
Author(s):  GHAFFARI MOHAMMAD, TAVAKOLI SABOUR ALI, PASSANDIDEH FARD MOHAMMAD*
 
* DEPARTMENT OF MECHANICAL ENGINEERING, FERDOWSI UNIVERSITY, MASHAD, IRAN
 
Abstract: 

The growing and diverse applications of low Reynolds number operating vehicles have compelled researchers to study them more accurately. Optimization is an important part of computational science that can improve the performance and increase the efficiency of the initial geometry. Most of the research studies on aerodynamic optimization were focused on high Reynolds number airfoils. But for aerodynamic devices that have small dimensions, like MAVs, usually the flow speed is low and thus the unsteady effects caused by boundary layer separation cannot be neglected. In this article, oscillating airfoil with pitching motion in turbulent and low Reynolds flow has been optimized with the continuous adjoint method. Lift to drag ratio was chosen to be the objective function and free form deformation parameters is adopted for the surface geometry perturbations. Since aerodynamic optimization generally consists of two parts, first, solving the flow equation and then computing the gradient of the objective function, in this article in order to evaluate the accuracy of the optimization process both have been validated. The results show that the adjoint equation converges well and with specifying the suitable constraints, the designed shape approaches the most optimized level without the loss of performance. In a way that the ratio of lift to drag coefficient increases to 84% in such a case.

 
Keyword(s): UNSTEADY ADJOINT METHOD, OPTIMIZATION, LOW REYNOLDS NUMBERS, TURBULENT FLOW, UNSTRUCTURED GRIDS
 
 
References: 
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+ Click to Cite.
APA: Copy

GHAFFARI, M., & TAVAKOLI SABOUR, A., & PASSANDIDEH FARD, M. (2017). CONTINUOUS ADJOINT SHAPE OPTIMIZATION FOR LOW REYNOLDS NUMBER OSCILLATING AIRFOILS IN VISCOUS FLOW ON UNSTRUCTURED GRIDS. MODARES MECHANICAL ENGINEERING, 17(7 ), 161-170. https://www.sid.ir/en/journal/ViewPaper.aspx?id=577827



Vancouver: Copy

GHAFFARI MOHAMMAD, TAVAKOLI SABOUR ALI, PASSANDIDEH FARD MOHAMMAD. CONTINUOUS ADJOINT SHAPE OPTIMIZATION FOR LOW REYNOLDS NUMBER OSCILLATING AIRFOILS IN VISCOUS FLOW ON UNSTRUCTURED GRIDS. MODARES MECHANICAL ENGINEERING. 2017 [cited 2021October22];17(7 ):161-170. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=577827



IEEE: Copy

GHAFFARI, M., TAVAKOLI SABOUR, A., PASSANDIDEH FARD, M., 2017. CONTINUOUS ADJOINT SHAPE OPTIMIZATION FOR LOW REYNOLDS NUMBER OSCILLATING AIRFOILS IN VISCOUS FLOW ON UNSTRUCTURED GRIDS. MODARES MECHANICAL ENGINEERING, [online] 17(7 ), pp.161-170. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=577827.



 
 
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