You will need the mesh file mesh_RAE2822_turb.su2, the config file turb_SA_RAE2822.cfg and initial solution files for the solver and adjoint solution_flow.dat, solution_adj_cd.dat, and solution_adj_cmz.dat. You can find the resources for this tutorial in the folder design/Turbulent_2D_Constrained_RAE2822 in the tutorial repository. We will walk through the shape design process and highlight several options related to the discrete adjoint (Automatic Differentiation) in SU2 and the configuration options for shape design. shape_optimization.py - automates the entire shape design process by executing the SU2 tools and optimizer.SU2_GEO - evaluates the thickness of airfoil and its gradient with respect to each design variable.SU2_DEF - deforms the geometry and mesh with changes in the design variables during the shape optimization process.SU2_DOT_AD - projects the adjoint surface sensitivities into the design space to obtain the gradient.SU2_CFD_AD - performs the adjoint flow simulations using automatic differentiation.SU2_CFD - performs the direct flow simulations.The following SU2 tools will be showcased in this tutorial: The airfoil geometry chosen for this tutorial is a RAE2822 airfoil (AGARD Report AR 138, 1979) at transonic speed in viscous turbulent fluid and constant C L. You can also use any other coordinates format from the website Airfoil database, where there’s a huge list of airfoils.Upon completing this tutorial, the SU2 user will be familiar with performing a constrained optimal shape design of a 2D airfoil geometry. DXF to be readable by AutoCAD, that simple. DAT file on the input, and select an output format of. DAT files or coordinate files to generate the airfoils on your CAD software, there are different ways to do it, but I like to keep it simple, I use a free software called Concord made by Martin Hepperle, and it’s available in his website, I just drag and drop the. The internet will help you with that, visit and search for the airfoil, then click on “Send to airfoil plotter” it will take you to a page where you will define the measurements of your airfoil, defining the Chord is enough, the rest can be left as default, then click plot and the file will be generated, but you have to download the one you’re going to use, normally a PDF is sufficient which then can be printed and used as a template.Īnother way is by downloading the. Take a look at the basic parts of an airfoil, you may have seen these terms. And the Coanda effect makes the air stick to the top surface of the wing even if it has a curvature and therefore will drive the air downwards creating lift, I think these three effects work together to produce lift. How they work is still in debate, but we can mention the effects involved with this process: The Bernoulli effect creates a low pressure on top of the surface, the third law of Newton which simply states that the force of the air pushing the bottom of the wing will drive it upwards. The airfoil changes naturally along the span of the wing just like nowadays in our airplanes.Īirplane wings have a slightly different airfoil adjusted for the performance they need. Looking at the wing of a bird a shape of an airfoil is seen, of course, birds normally fly at slow speeds so most of them will have an undercambered airfoil, which will produce more lift at slow speeds. Or for the contrary, if you want a fast airplane, you need a completely different airfoil. An airfoil is a special shape that will produce lift when it’s moved through the air in one direction, the shape can be seen if we look at the cross-section of a wing, a lot of physics is involved in the study of these shapes, to produce lift efficiently, and there are lots of shapes that can be used for different scenarios, not all are good for every situation, so if you plan to use an airfoil for a slow airplane there’s a good airfoil for that.
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