Numerical Study of Turbulent Air and Water Flows in a Nozzle Based on the Coanda Effect
| Autor: | Youssef El Halal, Liércio André Isoldi, Luiz Alberto Oliveira Rocha, Rafael de L. Lemos, Cristiano Fragassa, Elizaldo Domingues dos Santos, Crístofer Hood Marques |
|---|---|
| Přispěvatelé: | Halal, Youssef El, Marques, Crístofer H., Rocha, Luiz A.O., Isoldi, Liércio A., Lemos, Rafael de L., Fragassa, Cristiano, dos Santos, Elizaldo D. |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Water flow
Mass flow Airflow Nozzle Ocean Engineering finite volume method 02 engineering and technology 01 natural sciences turbulence model 010305 fluids & plasmas Physics::Fluid Dynamics coanda effect symbols.namesake computational fluid dynamic lcsh:Oceanography 0203 mechanical engineering lcsh:VM1-989 0103 physical sciences Mass flow rate lcsh:GC1-1581 Coandă effect H.O.M.E.R. nozzle Civil and Structural Engineering Water Science and Technology Finite volume method Turbulence lcsh:Naval architecture. Shipbuilding. Marine engineering Mechanics 020303 mechanical engineering & transports symbols Environmental science |
| Zdroj: | Journal of Marine Science and Engineering, Vol 7, Iss 2, p 21 (2019) Journal of Marine Science and Engineering Volume 7 Issue 2 |
| ISSN: | 2077-1312 |
| Popis: | In the present work it is performed a numerical study for simulation of turbulent air and water flows in a nozzle based on the Coanda effect named H.O.M.E.R. (High-Speed Orienting Momentum with Enhanced Reversibility). The main purposes of this work are the development of a numerical model for simulation of the main operational principle of the H.O.M.E.R. nozzle, verify the occurrence of the physical principle in a device using water as working fluid and generate theoretical recommendations about the influence of the difference of mass flow rate in two inlets and length of septum over the fluid dynamic behavior of water flow. The time-averaged conservation equations of mass and momentum are solved with the Finite Volume Method (FVM) and turbulence closure is tackled with the k-&epsilon model. Results for air flow show a good agreement with previous predictions in the literature. Moreover, it is also noticed that this main operational principle is promising for future applications in maneuverability and propulsion systems in marine applications. Results obtained here also show that water jets present higher deflection angles when compared with air jets, enhancing the capability of impose forces to achieve better maneuverability. Moreover, results indicated that the imposition of different mass flow rates in both inlets of the device, as well as central septum insertion have a strong influence over deflection angle of turbulent jet flow and velocity fields, indicating that these parameters can be important for maneuverability in marine applications. |
| Databáze: | OpenAIRE |
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