Wing Twist

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  Wing twist is of two types named as geometric twist and aerodynamic twist:- Geometric Twist Different angles of attack at wing root and tip. Wash in Tip chord has a higher angle of attack than that of root chord. Wash out Angle of attack at tip is lower than that at wing root. It is useful in reducing tip vortices. Aerodynamic Twist Difference between zero-lift lines of airfoils at wing root and near the tip. Airfoils at root and near the tip have different zero lift angles of attack.

Streamline, Streakline and Pathline

 

Streamline

Streamlines are the ones that drawn such that their tangents at every point along the streamline are in the same directions as the velocity vectors at that point and forms a powerful tool in understanding flows. This definition leads to the equation of streamline as follows :


Streakline

A line created by particles in a flow that have previously passed through a common point in the flow field. It is obtained by a simple and efficient integration of particle pathlines within the flow solver as the unsteady flowfield is computed.  


Pathline

The line traced by a given particle when it flows from one point to another in a flow field. In unsteady flow, the pathlines for different fluid elements passing through same point are not the same. 



                                        











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