Ph.D project - Jens Andreas Melheim

[Background] [Timetable] [Subjects] [Links] [Log] [Publications] [Home page]

Background

Working title: Modelling and numerical simulations of turbulent flows
with droplets in the presence of an electric field
Institute:Department of Energy and Process Engineering, NTNU
Supervisor:Professor Inge R. Gran
Fellowship sponsor:The Research Council of Norway
Duration:1th September 2003 - 31th August 2005
Objective: The aim of this project is to contribute to improve the understanding and design of coalescers for separating oil and water.
Abstract: The research topic is modelling of the interaction of turbulence, electric field, and droplets in a CFD framework. The trajectory of many droplets will be followed in a turbulent flow and every collision will be detected and simulated. The governing equations for the fluid are solved with a finite volume method. The exchange of mass and momentum between droplet and fluid are two-way coupled. It is believed that the particle tracking method with detection of every droplet collision will be a powerful tool for understanding the fundamental dynamics of an emulsion and in longer term for equipment design.

Timetable and milestones

 2002 2003 2004 2005
Main activities09 101112 010203 040506070809 101112 010203 040506070809 101112 010203 040506070809

1 Subjects

xxx x                                                                  

2 Efficent algorithm; neighbours

        xxx x x x                                                      

paper

                 

M

                                                      

3 Fluid-particle forces

                      x x x x x                                          

4 Reliable numerical solvers

                      xx xx x                                          

5 Multidrop electric forces

                      xx xx x                                          

paper

                             

M

                                          

6 Determinition of instantaneous
velocity field

                               xxx x xx xx                          

7 Particle-fluid interaction

                                                xx x                    

paper

                                                     

M

                  

8 Modelling of turbulent clustring

                                                  xx x xx xx xx      

paper

                                                                 

M

      

9 Simulation of electrocoalsence

                                                          x xx xx      

paper

                                                                 

M

      

10 Conclusion

                                                                  x xx

M

Subjects

 
 SIF5020 Lineære metoder Autumn 2002
SIF5048 Numerisk matematikk Autumn 2002
DIO1013 Multiphase modelling Autumn 2002

Links

Conferences
ICMF 2007
5th Annual World Congress on Particle Technology
2005 ASME Fluid Engineering Summer Meeting
Third International Conference on Computational Methods in Multiphase Flow
4th Int. Conference on CFD in the Oil and Gas, Metallurgical and Process Industries
11th Workshop on Two-Phase Flow Predictions
IUTAM Symposium on Computational Approaches to Dispersed Multiphase Flow
3rd International symposium in two-phase flow modelling and experimentation III
10th European Turbulence Conference
ICMF-2004

Organistations
ERCOFTAC
ASME
AIChE

Misc.
Universitetsbiblioteket i Trondheim
Web of Science
CFD online
Collegues
Svend Tollak Munkejord
Robert Olsen
Andrea Gruber
Matteo Chiesa

Log
2005-11-02:Submitted article entitled Simulation of turbulent electrocoalescence for publication in Chemical Engineering Science
2005-10-21: Electrocoalescence project meeting
2005-10-17: Birth of my second daughter, Brita
2005-09-15:Submitted article entitled Correlated motion of inertial particles in turbulent flows for publication in Physics of Fluids
2005-06-20 - 2005-06-23 :Attend 2005 ASME Fluid Engineering Division Summer Meeting
2005-06-16 - 2005-06-17 :Attend Third M.I.T. Conference on Computational Fluid and Solid Mechanics
2005-06-06 - 2005-06-08 :Attend CFD' 2005, Fourth International Conference on Computational Fluid Dynamics in the Oil and Gas, Metallurgical & Process Industries
2005-05-01:Submitted final papers to 2005 ASME Fluid Engineering Summer Meeting
2005-04-05 - 2005-04-09: Attend the 11th Workshop on Two-Phase Flow Predictions
2005-03-17: Electrocoalescence project meeting
2005-03-15.:Submitted paper to 11th Workshop on Two-Phase Flow Predictions, Merseburg, Germany
2005-03-01:Submitted paper to CFD 2005
2005-01-14:Submitted two draft papers to 2005 ASME Fluid Engineering Summer Meeting
2005-01-10:Submitted article entitled: Adaptive cell structure for efficient detection of neighbouring particles in collisional particle-laden flows
to Computers and Fluids
2004-12-30.:Paper accepted by 3rd MIT Conference on Computational Fluid and Solid Mechanics
2004-12-15.:Two abstracts accepted by 2005 ASME Fluid Engineering Summer Meeting
2004-12-14.:Submitted abstract to 11th Workshop on Two-Phase Flow Predictions, Merseburg, Germany
2004-12-13.:Article submitted 2003-12-16 to Journal of Computational Physics rejected :-(
2004-10-25.:Submitted article entitled Cluster integration method in Lagrangian particle dynamics for publication in Computer Physics Communication
2004-10-07.:Submitted abstract to 2005 ASME Fluid Engineering Summer Meeting
2004-10-04.:Returned from Germany
2004-05-30 - 2004-06-03.:Attend ICMF'04
2004-03-15:Start the stay at University of Halle , Insitute of Process Engineering
2004-03-04:Submitted full paper to ICMF-2004
2003-12-16:Submitted article entitled: Adaptive cell structure for efficient detection of neighbouring particles
to Journal of Computational Physics
2003-10-08:Submitted abstract to ICMF-2004
2003-09-22:Electrocoalescence project meeting
2003-09-08:Birth of my daugther Sigrid
2003-06-15:Applied the Research Council for an overseas fellowship, for a stay at University of Halle with Professor Martin Sommerfeld
2003-04-23 - 2003-04-25:Attend a course in presentation techniques
2003-03-20:Electrocoalescence project meeting
2002-12-09:Finished last exam :-)
2002-09-01:Start

Details
2. Efficent algorithm
  • Billiard simulation (Particles move in straight lines between collisions)
  • CPU time testing (Find optimal particle cell size and
    CPU-time(particles,collisions,...)
  • Adaptive particle cell structure (Development of a adaptive cell structure algorithm that maintains an
    optimal cell size wherever in the flow)
  • Paper together with Anders Gjelsvik, SINTEF Energy Research
3. Fluid-particle forces
  • Brief litteratur survey and implementation of the most important forces
    on the particles in a turbulent flow.
4. Reliable numerical solvers
  • Euler is unstable and first order, but consistent with the collisions time calculation.
  • Need a robust, stable and efficent solver, independent of the physical circumstances.
  • Higher order, fractional step, BDF?
  • Error and step size control?
5. Multidrop electric forces
  • First, I need to study basic electrostatics
  • Implementation of multi-body multi-pole model of Clercx and Bossis Many-body electrostatic interactions in electrorheological fluids
    Physical Review E Vol. 48 No. 4, 1993
  • Combine model/algorithm of Clercx and Bossis with neighbour finding algorithm .
  • Find a suited case from electrorheology.
  • Write a paper
6. Determinition of instantaneous velocity field
  • Small particles follow the flow well.
  • Therefore, a good realization of the turbulent motion is required.
  • Brief litterature study and implementation of promising models.
  • Key authors: Gouesbet and Berlemount
7. Particle-fluid interaction
  • If everything works well so far, the forces on the particles have to be
    on pushed back on the fluid, it follows directly from Newton's third law
  • Problems are expected because of the discontinuities in the particle paths.
  • Keywords: stability, convergence, and accuracy.
8. Modelling of turbulent clustring
  • The models for determination of the instantaneous velocity field do not handle the fact that close
    particles belong to the same turbulent eddy.
  • Particles with Stokes number about unity, based on the particle relaxation time and the Kolomogorov time scale
    tends to spin out of eddies and cluster of particles between the eddies are seen.
9. Simulation of electrocoalesence
  • By putting together the models mentioned above, it should be possible to simulate electrocoalesence with the Eulerian-Lagrangian formulation

Last modified: 2005-09-15 12:47 CET

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