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Fluids
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Models and Applications of Acoustic for Fluids
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Models and Applications of Acoustic for Fluids

A special issue of Fluids (ISSN 2311-5521).

Deadline for manuscript submissions: closed (15 April 2021) | Viewed by 10461

Special Issue Editors

Dr. Maurizio Arena

E-Mail Website
Guest Editor
Department of Industrial Engineering, Aerospace Section University of Naples “Federico II”, 80125 Naples, Italy
Interests: actuators; multifunctional materials; sensor technology; structural dynamics
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Massimo Viscardi

E-Mail Website
Guest Editor
Department of Industrial Engineering, Aerospace Section University of Naples “Federico II”, 80125 Naples, Italy
Interests: acoustic; finite element method; structural dynamics; SHM; vibration analysis and testing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The need of computing fluid-structural interactions arises in several engineering fields. A large amount of research works have been addressed to this topic during the last years with a special attention to transport industry development. The technological implications related to the safety, internal comfort have become and are going to be very stringent objectives since the preliminary design process. In such perspective, this special issue deals with collecting the most recent analytical, numerical and empirical outcomes as well as deep reviews with focus on the noise and vibrations propagation in fluid domains.

Dr. Maurizio Arena
Prof. Dr. Massimo Viscardi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Fluids is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • active control
  • fluid-structural interaction
  • numerial models
  • turbulent boundrary layer
  • under water noise

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Published Papers (3 papers)

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Research

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20 pages, 5473 KiB  
Article
SISO Piezo Based Circuit Development for Active Structural Vibration Control
by Maurizio Arena and Massimo Viscardi
Fluids 2020, 5(4), 183; https://doi.org/10.3390/fluids5040183 - 16 Oct 2020
Cited by 1 | Viewed by 2823
Abstract
This paper deals with the issue of developing a smart vibration control platform following an innovative model-based approach. As a matter of fact, obtaining accurate information on system response in pre-design and design phases may reduce both computational and experimental efforts. From this [...] Read more.
This paper deals with the issue of developing a smart vibration control platform following an innovative model-based approach. As a matter of fact, obtaining accurate information on system response in pre-design and design phases may reduce both computational and experimental efforts. From this perspective, a multi-degree-of-freedom (MDOF) electro-mechanical coupled system has been numerically schematized implementing a finite element formulation: a robust simulation tool integrating finite element model (FEM) features with Simulink® capabilities has been developed. Piezo strain actuation has been modelled with a 2D finite element description: the effects exerted on the structure (converse effect) have been applied as lumped loads at the piezo nodes interface. The sensing (direct effect) has instead been modelled with a 2D piezoelectric constitutive equation and experimentally validated as well. The theoretical study led to the practical development of an integrated circuit which allowed for assessing the vibration control performance. The analysis of critical parameters, description of integrated numerical models, and a discussion of experimental results are addressed step by step to get a global overview of the engineering process. The single mode control has been experimentally validated for a simple benchmark like an aluminum cantilevered beam. The piezo sensor-actuator collocated couple has been placed according to an optimization process based on the maximum stored electrical energy. Finally, a good level of correlation has been observed between the forecasting model and the experimental application: the frequency analysis allowed for characterizing the piezo couple behavior even far from the resonance peak. Full article
(This article belongs to the Special Issue Models and Applications of Acoustic for Fluids)
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24 pages, 7668 KiB  
Article
3D Printed Structured Porous Treatments for Flow Control around a Circular Cylinder
by Pranjal Bathla and John Kennedy
Fluids 2020, 5(3), 136; https://doi.org/10.3390/fluids5030136 - 14 Aug 2020
Cited by 14 | Viewed by 4353
Abstract
The use of porous coatings is one of the passive flow control methods used to reduce turbulence, noise and vibrations generated due to fluid flow. Porous coatings for flow stabilization have potential for a light-weight, cost-effective, and customizable solution. The design and performance [...] Read more.
The use of porous coatings is one of the passive flow control methods used to reduce turbulence, noise and vibrations generated due to fluid flow. Porous coatings for flow stabilization have potential for a light-weight, cost-effective, and customizable solution. The design and performance of a structured porous coating depend on multiple control parameters like lattice size, strut thickness, lattice structure/geometry, etc. This study investigated the suitability of MSLA 3D printers to manufacture porous coatings based on unit cell designs to optimize porous lattices for flow control behind a cylinder. The Reynolds number used was 6.1×104–1.5×105 and the flow measurements were taken using a hotwire probe. Different experiment sets were conducted for single cylinder with varying control parameters to achieve best performing lattice designs. It was found that lattice structures with higher porosity produced lower turbulence intensity in the wake of the cylinder. However, for constant porosity lattice structures, there was negligible difference in turbulence and mean wake velocity levels. Coating thickness did not have a linear relationship with turbulence reduction, suggesting an optimal thickness value. For constant porosity coatings, cell count in coating thickness did not influence the turbulence or mean wake velocity. Partial coating designs like helical and spaced coatings had comparable performance to that of a full coating. MSLA printers were found capable of manufacturing thin and complex porous lattices. Full article
(This article belongs to the Special Issue Models and Applications of Acoustic for Fluids)
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Other

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14 pages, 3918 KiB  
Case Report
Bidimensional Ray Tracing Model for the Underwater Noise Propagation Prediction
by Emmanuele D’Andrea, Maurizio Arena, Massimo Viscardi and Tommaso Coppola
Fluids 2021, 6(1), 19; https://doi.org/10.3390/fluids6010019 - 1 Jan 2021
Cited by 2 | Viewed by 2580
Abstract
An increasing attention has recently been paid to the effect of the underwater noise field generated by ship activities on the marine environment. Although this problem is widely discussed in international treaties and conventions, it has not yet found a consolidated technical-scientific treatment [...] Read more.
An increasing attention has recently been paid to the effect of the underwater noise field generated by ship activities on the marine environment. Although this problem is widely discussed in international treaties and conventions, it has not yet found a consolidated technical-scientific treatment capable of quantifying the level of underwater noise emissions produced by naval systems. As part of a national research collaboration, a novel code has been developed to predict noise propagation according to the Ray Tracing approach. Such optical geometry-based technique allows for calculating the Transmission Loss (TL) trend in its respective contributions: geometrical loss (due to the distance between the source and receiver), dissipation loss (due to the characteristics of the propagation environment), and reflection loss (due to the surfaces that delimit the field). The simulation requires as input parameters the source info as spatial position, frequency, and sound pressure level (SPL) as well as the sea properties like seabed depth, the speed of sound profile, the layers thickness the water column is divided into, the sea salinity, temperature, and pH. The simulation code provides the SPL spatial distribution useful as a fast industrial tool in the future studies addressed to identify the emission limits for the protection of marine wildlife. Full article
(This article belongs to the Special Issue Models and Applications of Acoustic for Fluids)
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