CFD analysis of the dynamic behaviour of a pipe system

Sekavčnik, Mihael; Ogorevc, T.; Škerget, L.

doi:10.1007/s10010-006-0024-6

Cited by 11 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Perez-Garcia et al 18 compared five turbulence models on internal compressible flow in T-type junctions: the standard k-ε, realizable k-ε, standard k-ω, SST k-ω, and S-A (Spalart−Allmaras) models. Sekavcnik et al 23 analyzed numerically the flow through a pipe using a system of RANS equations combined with a ZE turbulence model. In our study, calculations for the transfer line were made using standard k-ε, RNG k-ε, standard k-ω, and SST k-ω turbulence models.…”

Section: Mathematical Modelmentioning

confidence: 99%

Computational Fluid Dynamics Simulation of Internal Compressible Flow in Transfer Lines and Structural Optimization

Qin,

Cong,

Fang

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The design of transfer lines is a key factor affecting the transmission performance of petroleum transportations in vacuum distillation units of the petrochemical industry. Therefore, this study established a simulation method to describe compressible fluids in transfer lines and validated this method using a planar nozzle model and industrial data. Subsequently, the simulation results of pressure, velocity, and Ma number distribution were analyzed and discussed for seven sets of industrial transfer lines. The results indicate that the structure of the transition section and connection section is the key factor affecting the performance of the transfer line, and the connection forms of horizontal direct insertion (Case 1) and gradual expansion (Case 4 and Case 5) help to reduce the pressure drop in the transition section and connection section. For this reason, based on Case 1, a detailed analysis was conducted on the internal flow field and pressure drop at the connection under different mass flow rates, and a universal optimization method was proposed to connect the transition section and low-speed section in the transfer line. The results show that the optimized structure can eliminate large eddies at the connection section and reduce the pressure drop by 36.8%. The modeling methodology and the results presented will be useful for evolving better designs of transfer lines accompanying compressible fluids.

show abstract

Section: Mathematical Modelmentioning

confidence: 99%

Computational Fluid Dynamics Simulation of Internal Compressible Flow in Transfer Lines and Structural Optimization

Qin,

Cong,

Fang

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…9, it is seen that at smaller lengths of the transmission line, its dynamics has a considerably smaller influence on the behavior of the whole automatic control system. Reference [20], which considers the problem of flow of fluid through long pipes, shows that the length of the hydraulic transmission line is the parameter with the biggest influence on dynamic behavior. It also shows that the length of the hydraulic transmission is the parameter with the biggest influence on the dynamics of the entire system.…”

Section: Dynamic Behavior Of the System Controlled By The P Controllermentioning

confidence: 99%

Design of constant gain controllers for the hydraulic control system with a long transmission line

Nedić

Dubonjić

Filipović

2011

Forsch Ingenieurwes

View full text Add to dashboard Cite

The paper presents the problems of describing the system of a pump-controlled motor with a long transmission line by means of a mathematical model with lumped parameters where the long transmission line is divided into n segments. The mathematical model thus obtained is of high order but its order is reduced by applying the appropriate methodology, which considerably increases its use value. A P controller was designed for that mathematical model of the system. The graphical method which includes performances (specification of damping of the system) and stability margins was used in the design. Thanks to strong software support, the complexity of synthesis of controllers was considerably reduced in comparison with the methods presented in the literature. Dynamic behavior of the closed loop system was treated in intensive simulation. The methodology applied provides significant energy savings. penbetriebenen Motors mit einer langen hydraulischen Leitung vorgestellt. Das entwickelte mathematische Modell hö-herer Ordnung wird derart vereinfacht, dass seine Handhabung deutlich vereinfacht wird. Für dieses System wird ein P-Regler verwendet. Für den Entwurf wird eine graphische Methode benutzt, die die Kennlinien unter Angabe der Dämpfung des Systems und die Randstabilität einbezieht. Dank der Softwareunterstützung wurde die Komplexizität der Reglersynthese, im Vergleich zu bekannten Methoden der Literatur, bedeutend reduziert. Mit einer intensiven Modellierung wurde das dynamische Verhalten des Systems in einer geschlossenen Kopplung betrachtet. Die Methodologie, die angewendet wurde, ermöglicht bedeutende Energieersparnisse. List of symbolsA (m 2 ) cross section area A L , B L , C L , D L coefficients of the transfer matrix a i , a k , b k coefficients of the transfer function B (N m −2 ) module of compressibility B v (N m s) friction viscosity C (m 4 N −1 ) capacity of the transmission line C 1 (m 5 N −1 ) capacity of the transmission line C m , C p (m 5 N −1 ) capacity of the motor and the pump c (m s −1 ) speed of sound in the fluid D m , D p (m 3 rad −1 ) motor and pump displacement d (m) diameter of the transmission line E (N m −2 ) equivalent module of elasticity (fluid-pipe) g m gain margin J m (kg m 2 ) motor load inertia K a (m 3 V −1 rad −1 ) coefficient voltage-pump displacement K p gain P controllers K T G (V s rad −1 ) coefficient of the tacho-generator 232 Forsch Ingenieurwes (2011) 75:231-242 L (kg m −5 ) inductivity of the transmission line L 1 (kg m −4 ) inductivity of the transmission line l (m) length of the transmission line n number of segments of the long transmission line n p (rps −1 ) number of revolutions of the pump p 1 , p 2 , p n (Pa) pressure Q 1 , Q 2 , Q n (m 3 s −1 ) flow R (N s m −6 ) resistance of the transmission line R 1 (N s m −5 ) resistance of the transmission line R m , R p (N s m −5 ) resistance leakage of the motor and the pump s complex number s m stability margin T L (N m) external load T (ξ), U(ξ) Chebyshev functions of the first and second kinds t (s) time V (m 3 ) volum...

show abstract

“…Giannakopoulos et al, studied the incompressible flow at a low Reynolds number in a laboratory engine intake duct based on Bovendeerd's description of the flow development process in circular cross-section curved ducts, using direct numerical simulation [4,5]. Sekavčnik et al, proposed a method for determining key parameters to evaluate system operation in unsteady flow research, providing some reference for this study [6]. Most researchers focus on studying the intake and exhaust manifold.…”

Section: Introductionmentioning

confidence: 99%

Research on the Structure Optimization Design of Automobile Intake Pipe

Deng

Ran

2023

Applied Sciences

View full text Add to dashboard Cite

As the front end of the intake system, the intake dirty pipe is responsible for delivering sufficient and stable air to the air filter. Therefore, in order to meet the requirements of low intake resistance, it is necessary to correspondingly improve the flow resistance performance of the intake dirty pipe. In this study, the main research object was the intake pipe in the intake system of gasoline engine vehicles, and the internal gas flow field was simulated and analyzed. The results show that there are clear discrete velocity regions at the inlet and elbow, which affect the uniformity of the overall fluid flow and cause a certain pressure loss. After structural optimization, the total pressure difference at the inlet and outlet of the pipeline was reduced by 22.67% compared to the original model, and the total pressure loss was significantly reduced. A simplified model was used to make samples of the intake dirty pipes before and after performance improvement, and flow resistance tests were conducted respectively. The difference between test data and simulation data is within a reasonable range, and the simulation results are relatively reliable.

show abstract

CFD analysis of the dynamic behaviour of a pipe system

Cited by 11 publications

References 8 publications

Computational Fluid Dynamics Simulation of Internal Compressible Flow in Transfer Lines and Structural Optimization

Computational Fluid Dynamics Simulation of Internal Compressible Flow in Transfer Lines and Structural Optimization

Design of constant gain controllers for the hydraulic control system with a long transmission line

Research on the Structure Optimization Design of Automobile Intake Pipe

Contact Info

Product

Resources

About