Flow Control and Beyond Enhancing Performance and Energy Efficiency in Complex Fluid System

Dear Colleagues,

This Special Issue aims to attract works related to a diverse range of topics on the implementation of actuators for flow control in complex fluid systems. Fluid systems play a pivotal role in several industrial applications. The ability to manipulate and control flow fields is key for achieving considerable energy efficiency and performance enhancements. Bearing this in mind, this Special Issue intends to disseminate the most recent advances on various themes related to flow control, including the following: advanced flow control techniques; electro-hydro dynamics and magneto-plasma dynamics; novel fluid dynamic modeling approaches; the interplay between flow control techniques; novel actuators for fluid flow manipulation; cutting-edge materials and technologies for active and passive flow control; machine learning methods for smart flow control; and interdisciplinary research at the intersection of fluid dynamics, engineering, and sustainability.

Dr. Frederico Miguel Freire Rodrigues
Dr. M. Abdollahzadeh
Guest Editors

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• flow control
• actuators
• fluid systems
• electro-hydro dynamics
• magneto-plasma dynamics

Title: Investigating the Power Extraction of applying Hybrid Pitching Motion on a Wing with Leading and Trailing Flaps
Authors: SULEIMAN AWAD SULEIMAN SALEH; and Chang−Hyun Sohn
Affiliation: School of Mechanical Engineering, Kyungpook National University, Daegu 41566, South Korea.
Abstract: This research utilized a hybrid trajectory on a wing incorporating a dual flap with the goal of enhancing performance. The hybrid profiles initiate with a non−sinusoidal pattern during the interval 0.0 ≤ t/T ≤ 0.25, evolving toward a sinusoidal pattern within the range 0.25 < t/T ≤ 0.5. Similarly, hybrid motion follows a non−sinusoidal pattern in the range 0.5 < t/T ≤ 0.75, before shifting back to a sinusoidal pattern within the range 0.75 < t/T ≤ 1.0. The effectiveness of using hybrid trajectory on a wing with leading and trailing flaps in enhancing the energy harvesting performance is examined through numerical simulations. The results demonstrate that hybrid trajectories applied to a two−flap wing configuration outperform a single flat plate and a wing with leading and trailing flaps both operating under a sinusoidal trajectory. The wing length spans from 45% to 55%, with the leading flap length ranging from 25% to 35%. The trailing flap lengths adjust accordingly to ensure the combined total matches the flat plate's full length, which is 100%. The wing pitch angle was fixed at 85° while the leading flap's pitch angle varying between 40° and 55°, and the pitch angle of the trailing flap ranging from 0° to 20°. The findings reveal that utilizing hybrid motion on a wing fitted with leading and trailing flaps notably improves power output in comparison to configurations with either one plate or three plates. The power output is achieved at particular dimensions: a leading flap length of 30%, a wing length of 55%, and a trailing flap length of 15%. The corresponding pitch angles are 50° for the leading flap, 85° for the wing, and 10° for the trailing flap. The aforementioned configuration results in a 34.06% increase in output power in comparison to one plate and a 4.53% improvement in comparison to a wing with a two−flaps. The maximum efficiency for this setup reaches 44.21%. This underscores the superior performance of hybrid trajectories over sinusoidal trajectories in enhancing energy extraction performance.