How Do I Calculate Lift and Drag with Winglets?

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Discussion Overview

The discussion centers around the calculation of lift and drag characteristics, specifically in relation to the inclusion of winglets. Participants explore various methods and considerations for accurately determining these aerodynamic properties, touching on theoretical and practical aspects.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant inquires about how to calculate lift characteristics such as lift coefficient (cl) and drag coefficient (cd) while incorporating winglets.
  • Another participant mentions that the addition of winglets presents a non-linear problem, suggesting the use of wind tunnel testing or computational fluid dynamics (CFD) for analysis.
  • A request for clarification on the non-linear problem is made, indicating a need for more detailed explanation.
  • Another participant advises consulting foundational texts on aerodynamics to understand the calculations better and emphasizes the importance of specifying flow conditions, such as airspeed and whether the flow is compressible or incompressible.
  • This participant also notes that defining geometry and selecting appropriate solvers are crucial steps in CFD analysis.

Areas of Agreement / Disagreement

Participants do not reach a consensus on a specific method for calculating lift and drag with winglets. Multiple viewpoints and approaches are presented, indicating ongoing debate and exploration of the topic.

Contextual Notes

Participants highlight the need for specific flow conditions and the complexity introduced by winglets, which may affect the applicability of different aerodynamic theories and computational methods.

sakthivelzz
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Hi I need to know how to calculate lift characteristics like cl ,cd and so on... how can we include the winglets in it?
 
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Wind tunnel... cfd... addition of winglets is a non-linear problem.
 
viscousflow said:
Wind tunnel... cfd... addition of winglets is a non-linear problem.

Can u explain it in more clear way please??
 
why don't you just look through Fundamental of Aerodynamics and Low speed aerodynamics books to get some sense about how to calculate lift and drag ?
Then you come up here again and ask what you need exactly. You need to specify
your flow condition like airspeed..based on that we must imposed some laws: for instance,
compressible or incompressible,potential flow is applicable or not?
Those kinda things have to consider before you get your solutions. For CFD, you must define your geometry first..then..grid..then solver like potential flow solver or Full Navier Stoke equations. I recommend you read the books I mentioned and try to get some senses firstly.
Best Regards,
 

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