High Reynolds Number, Unsteady, Multiphase CFD Modeling of Cavitating Flows

Lindau, Jules W.; Kunz, Robert F.; Boger, David A.; Stinebring, David R.; Gibeling, H. J.

doi:10.1115/1.1487360

Cited by 88 publications

(49 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Half Sommerfeld condition [21], Reynolds cavitation boundary condition [15,16] and JFO (JakobssonFloberg-Olsson) condition [15,17] in a p-θ model are usually utilized in the analysis when using the Reynolds equation. And several cavitation models [19,22,23] in CFD analysis are also used.…”

Section: Resultsmentioning

confidence: 99%

The validity of the Reynolds equation in spool valve analysis considering cavitation

Hong

Kim

2016

Friction

View full text Add to dashboard Cite

Abstract:The purpose of this research is to investigate the validity of the Reynolds equation in spool valve analysis under cavitation. This study is carried out for a laminar and isothermal flow between a sleeve and spool with grooves. The pressure and lateral force obtained from the Reynolds equation and the Navier-Stokes equation are compared with variations of aspect ratio, cross sectional area, and number of grooves. The cavitation phenomenon is considered by using a cavitation model in the Navier-Stokes equation and the Reynolds cavitation boundary condition in the Reynolds equation. A large difference of more than 20% is found between the equations for a lateral force of spool valve with many grooves. It was found that the Reynolds equation is not suitable for calculation of a lateral force of the spool valve with multiple-grooves of which the width and depth are even larger than the clearance under cavitation.

show abstract

Section: Resultsmentioning

confidence: 99%

The validity of the Reynolds equation in spool valve analysis considering cavitation

Hong

Kim

2016

Friction

View full text Add to dashboard Cite

show abstract

“…Esta es una línea de investigación que en la actualidad es muy activa, presentándose numerosos trabajos y aportaciones sobre modelos de cavitación. Es muy habitual el uso de toberas o de tubos Venturi para realizar los ensayos experimentales y para validar los modelos de cavitación (Lindau et al, 2002;Singhal et al, 2002). También se ha analizado el comportamiento no estacionario de la formación de vapor con un Venturi rectangular (Delgosha et al, 2003).…”

Section: Introductionunclassified

Diseño y predicción del funcionamiento de inyectores Venturi en riego localizado

Manzano¹,

Azevedo

Bomfim

et al. 2014

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

se ha estudiado el diseño y funcionamiento de cuatro prototipos del inyector Venturi con técnicas de Dinámica de Fluidos Computacional (CFD), comparándo las con ensayos en laboratorio. Para cada prototipo, las geometrías definidas y analizadas han permitido simular el funcionamiento sin (G1) y con inyección (G2) para quimigación. En el caso G1, se presentan los gráficos del perfil de presiones en el eje del inyector para diversas velocidades, así como la distribución del campo de presiones y de la evolución de las diferencias de presión y pérdidas de carga frente al caudal principal. Para comparar los resultados obtenidos con CFD frente al resultado experimental, se calculó el error relativo. En el caso G2, se obtuvo la representación gráfica del el caudal de inyección frente al caudal principal. Las técnicas CFD exigen un buen ajuste del modelo para dar un resultado aceptable. Son interesantes para comparar geometrías, analizar sus variantes, realizar prediseños y aproximar ordenes de magnitud, pero es recomendable su ensayo en laboratorio para validar los resultados. Design and prediction performance of Venturi injectors in drip irrigation A B S T R A C TThe design and prediction performance of four Venturi injector prototypes have been studied using Computational Fluid Dynamics (CFD) techniques. Results were compared with experimental tests carried out in the laboratory of the Universitat Politècnica de València, Valencia, Spain. The analysed and selected geometries for each prototype were used to simulate the operation without nutrient injection (G1) and with nutrient injection (G2). In first case (G1), the results were presented in the form of pressure profile at the injector axe under different velocities and the pressure distribution in the whole geometry. Additionally, this paper analysed the evolution of pressures and head loss versus main water flow in the different prototypes. The relative error was estimated to compare CFD and experimental results. The second case (G2), the graphical representation for the relations between the nutrient aspiration flow and water main flow were obtained for numerical and experiment approaches. In conclusion, CFD techniques appear as a suitable tool for the analysis of the Venturi injector operation, but its validation with experimental data is recommended.Palabras-clave: dinámica de fluidos computacional RANS quimigación

show abstract

“…Wikström [220] mentions that C prod and C dest must be set as high as possible in order to simulate almost instant transition. [129] 100,000 200 Huuva (2008) [99] 1000 1000 …”

Section: Appendix C Linear Acoustics For Water Hammer Problemmentioning

confidence: 99%

Numerical simulation of unsteady three-dimensional sheet cavitation

Koop¹

View full text Add to dashboard Cite

High Reynolds Number, Unsteady, Multiphase CFD Modeling of Cavitating Flows

Cited by 88 publications

References 6 publications

The validity of the Reynolds equation in spool valve analysis considering cavitation

The validity of the Reynolds equation in spool valve analysis considering cavitation

Diseño y predicción del funcionamiento de inyectores Venturi en riego localizado

Numerical simulation of unsteady three-dimensional sheet cavitation

Contact Info

Product

Resources

About