نتایج جستجو برای: lift coefficient

تعداد نتایج: 180477  

Journal: :journal of computational & applied research in mechanical engineering (jcarme) 2012
abolfazl khalkhali* hamed safikhani

in this paper, lift and drag coefficients were numerically investigated using numeca software in a set of 4-digit naca airfoils. two metamodels based on the evolved group method of data handling (gmdh) type neural networks were then obtained for modeling both lift coefficient (cl) and drag coefficient (cd) with respect to the geometrical design parameters. after using such obtained polynomial n...

2000
Sangho Kim Juan J. Alonso Antony Jameson

An adjoint-based Navier-Stokes design and optimization method for two-dimensional multi-element high-lift configurations is derived and presented. The compressible Reynolds-Averaged Navier-Stokes (RANS) equations are used as a flow model together with the Spalart-Allmaras turbulence model to account for high Reynolds number effects. Using a viscous continuous adjoint formulation, the necessary ...

2001
Sangho Kim Juan J. Alonso Antony Jameson

An adjoint-based Navier-Stokes design and optimization method for two-dimensional multi-element high-lift configurations is derived and presented. The compressible Reynolds-Averaged Navier-Stokes (RANS) equations are used as a flow model together with the Spalart-Allmaras turbulence model to account for high Reynolds number effects. Using a viscous continuous adjoint formulation, the necessary ...

Journal: :مکانیک سیالات و آیرودینامیک 0
سید آرش سید شمس طالقانی عبدالله شادآرام مسعود میرزایی

active flow control has great importance in design of flying objects in general and control flaps in particular. using dielectric barrier discharge as plasma actuators over control flaps can cause a change in position of separation point or can eliminate it. this new flow control device produces a body force that causes generating a micro wall jet. the present study aims to investigate experime...

Journal: :Expert Systems With Applications 2023

The evaluation of aerodynamic performance is a crucial aspect aircraft design optimization. However, traditional methods are time-consuming and expensive. While machine learning techniques can achieve high accuracy, their application in engineering challenging due to poor generalization ”black box” nature. In this paper, knowledge-embedded meta-learning model proposed that integrates data with ...

Journal: :Journal of The Institution of Engineers (India): Series A 2020

2005
C. J. PENNYCUICK CARLTON E HEINE SEAN J. KIRKPATRICK MARK R. FULLER

The distribution of dynamic pressure behind a Harris' hawk's wing was sampled using a wake rake consisting of 15 pitot tubes and one static tube. The hawk was holding on to a perch, but at an air speed and gliding angle at which it was capable of gliding. The perch was instrumented, so that the lift developed by the wing was known and the lift coefficient could be calculated. The mean of 92 est...

2016
Changping Liang Sen Zhang Baofeng Chen Xiangqian Wang Qinglong Guo

Optimizing the NACA0015 airfoil which is widely applied in small-scale vertical axis wind turbine to make it has a better aerodynamic performance. In the optimization process, using CST parameterization method to perturb the airfoil geometry, the thickness and camber of the airfoil are selected as the constraint, and the value of the maximum tangential force coefficient is chosen as the objecti...

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