FG Aerodynamik

5 Items

Recent Submissions
Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Löffler, Stephan ; Ebert, Carola ; Weiss, Julien (2021-04-20)

The control of flow separation on aerodynamic surfaces remains a fundamental goal for future air transportation. On airplane wings and control surfaces, the effects of flow separation include decreased lift, increased drag, and enhanced flow unsteadiness and noise, all of which are detrimental to flight performance, fuel consumption, and environmental emissions. Many types of actuators have bee...

Tuft deflection velocimetry: a simple method to extract quantitative flow field information

Steinfurth, Ben ; Cura, Carolina ; Gehring, J. ; Weiss, Julien (2020-06-06)

A novel method capable of assessing flow fields in a quick and relatively simple manner is introduced. In an extension to the classical qualitative flow visualization by means of cotton or polymeric tufts, digital data processing is used to extract the orientation of these tufts. This information can be related to physical quantities, in particular to time- and space-dependent velocity signals....

Aircraft-scale application of active separation control at the pylon-wing junction

Schlösser, Philipp (2019)

The wing area behind the pylon-wing junction of conventional civil aircraft configurations with underwing-mounted turbofan engines is susceptible to local flow separation at high angles of attack, which potentially impacts the maximum lift performance of the aircraft. With further advances in turbofan engine technology, bypass-ratios will reach levels of larger than 15:1. As long as no drastic ...

Data for A Tutorial on the Proper Orthogonal Decomposition

Weiss, Julien (2019-06-19)

Experimental database from AIAA Paper 2019-3333 (A Tutorial on the Proper Orthogonal Decomposition) presented at the AIAA Aviation Conference 2019 in Dallas, Texas, on June 19th, 2019. The database consits of 2D velocity fields measured by PIV that are used to generate the figures in the paper.

A Tutorial on the Proper Orthogonal Decomposition

Weiss, Julien (2019)

This tutorial introduces the Proper Orthogonal Decomposition (POD) to engineering students and researchers interested in its use in fluid dynamics and aerodynamics. The objectives are firstly to give an intuitive feel for the method and secondly to provide example MATLAB codes of common POD algorithms. The discussion is limited to the finite-dimensional case and only requires knowledge of basic...