Development & Large Scale Validation of a Transient Flow Assurance Model for the Design & Monitoring of Large Particles Transportation in Two Phase (Liquid-Solid) Riser Systems

2015 ◽  
Author(s):  
Claire Beauchesne ◽  
Thomas Parenteau ◽  
Cyril Septseault ◽  
Pierre-Antoine Béal
Keyword(s):  
Large Scale ◽  
Transient Flow ◽  
Scale Validation ◽  
Flow Assurance ◽  
Two Phase ◽  
Large Particles ◽  
Phase Liquid

An Investigation Into the Effect of Subcooled Liquid Inertia on Flow-Change-Induced Transient Flow Surges in Horizontal Condensing Flow Systems

2005 ◽  
Vol 127 (11) ◽  
pp. 1280-1284 ◽  
Author(s):  
C. J. Kobus
Keyword(s):  
Flow Rate ◽  
Large Scale ◽  
Transient Flow ◽  
Phase Region ◽  
Complex Nature ◽  
Vapor Flow ◽  
Two Phase ◽  
Subcooled Liquid ◽  
Flow Systems ◽  
Final Steady State

The objective of this research is to investigate large-scale transient flow surges of the condensate leaving in-tube condensing flow systems because of perturbations in the inlet vapor flow rate, and the influence of the subcooled liquid inertia of the condensate on these transient responses. Small changes in the inlet vapor flow rate momentarily cause large transient flow surges in the outlet liquid flow rate. Condensate inertia is seen to destabilize the system into an underdamped behavior where the flow rate can overshoot the final steady-state position several times. A one-dimensional, two-fluid, distributed parameter system mean void fraction (SMVF) model of the time-dependent distribution of liquid and vapor within the two-phase region is developed for predicting these transient characteristics, which it is seen to do quite well, especially when consideration is given to the complex nature of the problem.

Modeling of Transient Two-Phase Liquid-Liquid Flow in Pipelines

2001 ◽  
Author(s):  
R. Núñez-Solís ◽  
Yuri V. Fairuzov
Keyword(s):  
Transient Flow ◽  
Fluid Pressure ◽  
Computer Code ◽  
Hilly Terrain ◽  
Two Phase ◽  
Immiscible Liquids ◽  
Fluid Transients ◽  
Phase Liquid ◽  
Oil Water ◽  
Startup Period

Abstract A study of transient oil-water flow in hilly-terrain pipelines is described in the present paper. Numerical simulation of terrain slug propagation during the line startup is performed using a novel computer code, mFLOW, for modeling transient flow of two immiscible liquids in pipelines. It is shown that a startup slug may propagate through the system without deformation of its front and tail or may dissipate. The mechanisms of slug dissipation are discussed. It is shown that the fluid pressure response is governed mainly by the process of water holdup wave propagation. It is demonstrated that the analysis of fluid transients in pipelines conveying oil-water mixtures provides useful information for the evaluation of the risk of over-pressurization during the startup period.

Numerical Investigation of Sloshing in a Tank: Statistical Description of Experiments and CFD Calculations

2010 ◽  
Author(s):  
Bogdan Iwanowski ◽  
Marc Lefranc ◽  
Rik Wemmenhove
Keyword(s):  
Experimental Data ◽  
Large Scale ◽  
Single Phase ◽  
Stokes Equations ◽  
Numerical Study ◽  
Point Of View ◽  
Navier Stokes ◽  
Two Phase ◽  
Statistical Point ◽  
Phase Liquid

Numerical study of liquid dynamics in an LNG tank is presented. The available data from large scale (1:10) sloshing experiments of 2D section of an LNG carrier reveal large scatter in recorded values of peak pressures. The experimental data is analysed from statistical point of view in order to obtain distributions of the pressure peaks. Then the entire experimental data record is reproduced numerically by CFD simulations and it is shown that pressure peaks obtained numerically display scatter of values as well. A statistical description of the numerically obtained record is provided and compared with description derived from the experimental data. The applied CFD code ComFLOW solves Navier-Stokes equations and uses an improved Volume of Fluid (iVOF) method to track movement of fluid’s free surface. Two different fluid models, single-phase (liquid+void) and two-phase (liquid+compressible gas) can be applied, the latter model being capable of simulating bubbles and gas entrapped in liquid. For low tank filling rate discussed in the paper (10%) the single-phase approach is sufficient. Comparison of statistical properties of experimental and numerical records is offered.

Numerical Simulation of Sloshing in a Tank, CFD Calculations Against Model Tests

2009 ◽  
Author(s):  
Bogdan Iwanowski ◽  
Marc Lefranc ◽  
Rik Wemmenhove
Keyword(s):  
Computer Animation ◽  
Large Scale ◽  
Stokes Equations ◽  
Fluid Pressure ◽  
Practical Interest ◽  
Physical Models ◽  
Navier Stokes ◽  
Two Phase ◽  
Navier Stokes Equations ◽  
Phase Liquid

Simulation of liquid dynamics in an LNG tank is studied numerically. The applied CFD code solves Navier-Stokes equations and uses an improved Volume of Fluid (iVOF) method to track movement of fluid’s free surface. Relative advantages of using two different fluid models, single-phase (liquid+void) and two-phase (liquid+compressible gas) are discussed, the latter model being capable of simulating bubbles and gas entrapped in liquid. Furthermore, the 1st and 2nd order upwind differencing schemes are used with both physical models leading to a total of four possible approaches to solve the problem. Numerical results are verified against experimental data from large scale (1:10) sloshing experiments of 2D section of an LNG carrier. The CFD vs. experiment comparison is shown for tank filling rates of practical interest, ranging from 10% to 95%, and includes both fluid height and fluid pressure exerted on tank walls. A visual comparison in form of computer animation frames, synchronised with camera-made movies taken during the experiments is included as well. Finally, an exhaustive computational grid convergence study is presented for lower filling rates of the tank.

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